Useful assembly libraries for BSW GEOS operating system programming
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README

geoModules (C)1997-2017 Bo Zimmerman
Please read the LICENSE file for license information
Please read the NOTICE file for credits information
Home Page: http://www.zimmers.net/geos/geomods.html


The geoModules project


The purpose of my geoModules project:. The user interface standards of GEOS are well known to users and programmers alike, and this creates the constant threat of duplicate code whenever a new app is written. With this in mind, I embarked on my geoModules project with the following goals:

That each module should support a single programming purpose.
That each module be self contained and self reliant.
All modules use shared temporary space.
All module functions support a common function-calling convention.
All modules adopt a standard naming convention to support the function-calling conventions, as well as naming all local labels by beginning the name with a three character code unique to that module.

The implementation of these goals required that first a meta-module be created to provide the common temporary work space, and a common set of routines to support the calling standard calling convention.


The Common Function Interface

The function interface for all modules is as follows:

All functions have a normal and in-line call.
Normal calls are unprotected. Registers are not saved, and all parameters must be manually loaded into the proper registers before calling.
In-line calls are protected. Registers A2-A6 are saved, along with the .y register.
In-line function names begin with the standard "i_" prefix.
All functions will use the module and common work space, system registers, and application registers A2-A6 only.
Parameters may be pointers, characters, or whatever will fit in registers A2-A6, which is the limit of the parameter passing space.
This common functional interface is supported by a single linkable module called "APIcommon". It is required of all modules that they be linked along with this "metamodule" in order to make use of the shared resources. APIcommon contains four 20 character temporary buffers to be shared by all modules, and also includes the following functions:

APISavRegs: saves the status register, .a, and .x
APIResRegs: restores .a, .x, and the status register
APISavSys: calls APISavRegs, saves GEOS registers A2-A6, and then APIResRegs
APIinit: Calls APISavSys, and saves its return address
APIreturn: Calls APISavRegs, restores the return address, and restores A2-A6

geoModules implemented

Below are all of the modules hitherto implemented along with their functions and parameters. They are all tested unless otherwise noted.

MODstring - Various string handling routines
MODwin2 - Dual movable windows module
MODflist - Directory files/list handling routines
MODclicks - Random click area helper code
MODdaAB - Desk accessory menu and About menu module
MODferr - File/Disk error message box
MODscrn - General OK, Cancel, and Yes/No dialogs
MODvPrg - VLIR application support module
MODfbox - Open/Create/Quit box, along with support dialogs
MODseqW - Create and write to sequential-type files.
MODgeoWx - Creation and writing to geoWrite documents.
MODseqR - Opening and reading from sequential-type files.
MODsecIO - Support for reading to and from disk sectors in order.
MODgeoRx - Opening and reading geoWrite documents to a window.
MODtbox - Multi-line text box support.
MODdemo - Assist in creation of limited-use demo applications.
MODconvert - Convert and Unconvert GEOS files to and from .CVT.
MODfcopy - Copy any file type from one drive to another.

MODstring

Introduction: This module is intended to handle all facets of string manipulation. A string is defined as a sequential series of bytes representing GEOS ASCII characters, and terminated by a null character (0).

Functions:

Append String: appends the source string to the end of the destination string.
Return Values: returns the high byte of string length in .a and low byte in .x
AppStr
	A2	Pointer to destination string
	A3	Pointer to source string
i_AppStr
	.word	Pointer to destination string
	.word	Pointer to source string

String Length: returns the length of a string
Return Values: returns the high byte of string length in .a and low byte in .x
StrLen
	A2	Pointer to source string
i_StrLen
	.word	Pointer to source string

Reverse Strng: reverses (mirror images) the characters in a given string
Return Values: returns the high byte of string length in .a and low byte in .x
RevStr
	A2	Pointer to source string
i_RevStr
	.word	Pointer to source string

To Uppercase : converts a string to uppercase characters
Return Values: returns the high byte of string length in .a and low byte in .x
ToUpper
	A2	Pointer to source string
i_ToUpper
	.word	Pointer to source string

To Lowercase : converts a string to lowercase characters
Return Values: returns the high byte of string length in .a and low byte in .x
ToLower
	A2	Pointer to source string
i_ToLower
	.word	Pointer to source string

To PETSKII   : converts a string to the CBM "PETSKII" character set
Return Values: returns the high byte of string length in .a and low byte in .x
ToPETSKII
	A2	Pointer to source string
i_ToPETSKII
	.word	Pointer to source string

To Uppercase : converts a null terminated CBM "PETSKII" string to GEOS ASCII characters
Return Values: returns the high byte of string length in .a and low byte in .x
ToASCII
	A2	Pointer to source string
i_ToASCII
	.word	Pointer to source string


Inside String: Locates the location of one string inside another
Return Values: returns the high byte of found string in .a and low byte in .x, null otherwise
InStr
	A2	Pointer to source string
	A3	Pointer to string to search for
i_InStr
	.word	Pointer to source string
	.word	Pointer to string to search for

Compare Strng: Compares two strings
Return Values: returns result of the search in .a, .x has 0
CmpStr
	A2	Pointer to first string
	A3	Pointer to second string
i_CmpStr
	.word	Pointer to first string
	.word	Pointer to second string

Copy Strings : Copies first string into the second
Return Values: returns the high byte of string length in .a and low byte in .x
CpyStr
	A2	Pointer to source string
	A3	Pointer to destination string
i_CpyStr
	.word	Pointer to source string
	.word	Pointer to destination string


MODwin2

Introduction: This powerful modules provides support for the creation of two movable, resizable, overlapping windows. The windows contain a centered titlebar, and two work bars on the right and bottom, which the programmer may use as he pleases. They also contain a programmable close button on the top right, and a resizing gadget on the bottom right. The windows are moved by dragging the window by the title bar. The windows are initialized by calling Win1Mv, Win2Mv, Win1Init, Win2Init, and finally WindInit. Only that last should receive a non-null for the "Draw Now" parameter. Also, WindInit must only be called once per application, while the others may be re-called at will.

Functions:

Window 1 Move: Initializes the position of, or moves, Window 1.
Return Values: NONE
Win1Mv
	A2L	The top position for the window
	A2H	The bottom position for the window
	A3	The left position for the window
	A4	The right position for the window
	A5L	Draw Now flag (0=no, 1=yes)
i_Win1Mv
	.byte	The top position for the window
	.byte	The bottom position for the window
	.word	The left position for the window
	.word	The right position for the window
	.byte	Draw Now flag (0=no, 1=yes)

Window 2 Move: Initializes the position of, or moves, Window 2.
Return Values: NONE
Win2Mv
	A2L	The top position for the window
	A2H	The bottom position for the window
	A3	The left position for the window
	A4	The right position for the window
	A5L	Draw Now flag (0=no, 1=yes)
i_Win2Mv
	.byte	The top position for the window
	.byte	The bottom position for the window
	.word	The left position for the window
	.word	The right position for the window
	.byte	Draw Now flag (0=no, 1=yes)

Window 1 Init: Initializes certain variables for Window 1
Return Values: NONE
Win1Init
	A2	Pointer to null terminated titlebar string
	A3	Pointer to a routine to execute when close button clicked
	A4	Pointer to code to complete drawing of this window
	A5L	Enabled flag (1=enabled, 0=disabled)
i_Win1Init
	.word	Pointer to null terminated titlebar string
	.word	Pointer to a routine to execute when close button clicked
	.word	Pointer to code to complete drawing of this window
	.byte	Enabled flag (1=enabled, 0=disabled)

Window 2 Init: Initializes certain variables for Window 2
Return Values: NONE
Win1Init
	A2	Pointer to null terminated titlebar string
	A3	Pointer to a routine to execute when close button clicked
	A4	Pointer to code to complete drawing of this window
	A5L	Enabled flag (1=enabled, 0=disabled)
i_Win1Init
	.word	Pointer to null terminated titlebar string
	.word	Pointer to a routine to execute when close button clicked
	.word	Pointer to code to complete drawing of this window
	.byte	Enabled flag (1=enabled, 0=disabled)

IsOverlapping: Returns whether the two windows are presently overlapped. * Unprotected.
Return Values: .a $ff=overlapped, 0=no overlap
IsOverlap

ReDraw Windw1: Completely redraws window 1.  Must set dispBufferOn first. * Unprotected.
Return Values: NONE
DrawWin1

ReDraw Windw2: Completely redraws window 2.  Must set dispBufferOn first. * Unprotected.
Return Values: NONE
DrawWin2

ReDraw Active: Completely redraws active window. Must set dispBufferOn first. * Unprotected.
Return Values: NONE
DrawWinA

ReDraw InActv: Completely redraws inactive window. Must set dispBufferOn first. * Unprotected.
Return Values: NONE
DrawWinI

Ready Window1: Copies the coordinates of window 1 into R2-R4.  *Unprotected.
Return Values: R2L - Top of window
               R2H - Bottom of window
               R3  - Left coordinate of window
               R4  - Right coordinate of window
RedyWin1

Ready Window2: Copies the coordinates of window 2 into R2-R4.  *Unprotected.
Return Values: R2L - Top of window
               R2H - Bottom of window
               R3  - Left coordinate of window
               R4  - Right coordinate of window
RedyWin2

Ready Active : Copies the coordinates of active window into R2-R4.  *Unprotected.
Return Values: R2L - Top of window
               R2H - Bottom of window
               R3  - Left coordinate of window
               R4  - Right coordinate of window
RedyWinA

Ready InActiv: Copies the coordinates of inactive window into R2-R4.  *Unprotected.
Return Values: R2L - Top of window
               R2H - Bottom of window
               R3  - Left coordinate of window
               R4  - Right coordinate of window
RedyWinI

Get Str Width: Returns the pixel width of a given string.  *Unprotected.
Return Values: APITemp2 contains width of string in LB/HB format.
GetStrWidth
	R0	points to null-terminated string

Win Activate : Activates (brings to the foreground) a particular window and redraws.
Return Values: NONE
WinAct
	A2L	0 = swap, 1=activate Window 1, 2=activate Window 2
i_Winact
	.byte	0 = swap, 1=activate Window 1, 2=activate Window 2


MODflist

Introduction: Handles the retreival of complete disk filename lists into a buffer as null-terminated strings. It also includes all manner of traversal and display routines for any lists formatted in this way.

Functions:

Get File List: Retreives a buffer of filenames from the current drive.
Return Values: .x contains standard errors
FileList
	A2	Pointer to a destination buffer
	A3	Pointer to the end of the destination buffer
i_File2List
	.word	Pointer to a destination buffer
	.word	Pointer to the end of the destination buffer

Get File List 2: Retreives a buffer of filenames from the current drive.
				This version is slightly more versatile than Get File List
Return Values: .x contains standard errors
FileList
	A2	Pointer to a destination buffer
	A3	Pointer to the end of the destination buffer
	A4L	Number of file entries to skip
	A4H	Maximum number of file entried to read
i_FileList
	.word	Pointer to a destination buffer
	.word	Pointer to the end of the destination buffer
	.byte	Number of file entries to skip
	.byte	Maximum number of file entried to read

Copy Filename: Copies a $A0 terminated filename string into a null terminated string buffer.
Return Values: NONE
CopyFnam
	A2	Pointer to the filename
	A3	Pointer to the destination string buffer
i_CopyFnam
	.word	Pointer to the filename
	.word	Pointer to the destination string buffer

Print a List : Displays a list inside of a window
Return Values: .a = whether a filename was highlighted, .x = total files displayed
PrntList
	A2	Pointer to the first string to display
	A3L	Which filename (relative to the first) to highlight
	R2L	Top of the box to print inside
	R2H	Bottom of the box to print inside
	R3	Left side of the box to print in
	R4	Right side of the box to print in
i_PrntList
	.word	Pointer to the first string to display
	.byte	Which filename (relative to the first) to highlight
	R2L	Top of the box to print inside
	R2H	Bottom of the box to print inside
	R3	Left side of the box to print in
	R4	Right side of the box to print in

Go Down List : Skip down a number of strings in a list
Return Values: .x = 0 if ok, 1 of error
DownList
	A2	Pointer to the first string
	A3	Pointer to a place to put the result pointer
	A4L	How far down to skip
i_DownList
	.word	Pointer to the first string
	.word	Pointer to a place to put the result pointer
	.byte	How far down to skip

Go Up in List: Travel up a list of null-terminated strings
Return Values: .x = 0 if ok, 1 of error
UpList
	A2	Pointer to the current string
	A3	Pointer to the start of the list
	A4	Pointer to a place to put the result pointer
	A5L	How far up to skip
i_UpList
	.word	Pointer to the current string
	.word	Pointer to the start of the list
	.word	Pointer to a place to put the result pointer
	.byte	How far up to skip

Click in List: Determine if one of the items in a list has been clicked on
Return Values: .x = 0 if none, or the filename number clicked on
ClkList
	R2L	Top of the box to print inside
	R2H	Bottom of the box to print inside
	R3	Left side of the box to print in
	R4	Right side of the box to print in

Pick frm List: Select (highlight) an item in a list
Return Values: .x = 0 if ok, 1 if not done
PikList
	A2L	Which item number to affect
	R2L	Top of the box to print inside
	R2H	Bottom of the box to print inside
	R3	Left side of the box to print in
	R4	Right side of the box to print in
i_PikList
	.byte	Which item number to affect
	R2L	Top of the box to print inside
	R2H	Bottom of the box to print inside
	R3	Left side of the box to print in
	R4	Right side of the box to print in


MODclicks

Introduction: Remembers the dimensions of 20 or more click areas (buttons, or whatever). Includes functions to dynamically set the click areas, detect mouse clicks within them, and automatically handle these clicks.

Functions:

Set a Click  : Set or change a click area
Return Values: NONE
SetClick
	A2L	Top of the click area
	A2H	Bottom of the click area
	A3	Left side of click area
	A4	Right side of the click area
	A5	Routine to execute on click (or null if none)
	A6L	Click area ID number to set (1-20)
i_SetClick
	.byte	Top of the click area
	.byte	Bottom of the click area
	.word	Left side of click area
	.word	Right side of the click area
	.word	Routine to execute on click (or null if none)
	.byte	Click area ID number to set (1-20)

Set Click Win: Set or change a click area using window data
Return Values: NONE
WSetClick
	A2	Routine to execute on click (or null if none)
	A3L	Click area ID number to set (1-20)
	R2L	Top of the click area
	R2H	Bottom of the click area
	R3	Left side of click area
	R4	Right side of the click area
i_WSetClick
	.word	Routine to execute on click (or null if none)
	.byte	Click area ID number to set (1-20)
	R2L	Top of the click area
	R2H	Bottom of the click area
	R3	Left side of click area
	R4	Right side of the click area

Check Click  : Determine if a click area has been clicked in
Return Values: .x = 0 if clicked inside, $ff if not clicked inside
ChkClick
	A2L	Click area ID number to check (1-20)
i_ChkClick
	.byte	Click area ID number to check (1-20)

Do a Click   : Check if a click area's selected; execute its routine if so. * Unprotected.
Return Values: NONE
DoClick
	A2L	Click area ID number to check (1-20)

Do all Clicks: Check all active click areas; execute routines if necessary. * Unprotected.
Return Values: NONE
DoAllClicks


MODdaAB

Introduction: This great module handles the initialization of a GEOS menu to include all desk accessories on the current drive. It will handle execution of the desk accessories on this menu when appropriate. It also includes a "program info" (about) option off the geos menu, and will display a dialog box with strings of your choice on selection of this option. After this module is initialized, it must be linked to your main menu code by pointing your "geos" menu to the structure "DAABMenu".

Functions:

Init DAs, Abt: Initialize the functionality of this module
Return Values: NONE
InitDaAb
	A2	Routine pointer to refresh the screen after about box display (or null)
	A3	Routine pointer to refresh the app after desk accessory return (or null)
	A4	Routine pointer to save app data before desk accessory execute (or null)
	A5	Pointer to a buffer of four strings to display in the about box
i_InitDaAb
	.word	Routine pointer to refresh the screen after about box display (or null)
	.word	Routine pointer to refresh the app after desk accessory return (or null)
	.word	Routine pointer to save app data before desk accessory execute (or null)
	.word	Pointer to a buffer of four strings to display in the about box


MODferr

Introduction: Displays a dialog box with one of the GEOS disk error messages.

Functions:

File Error   : Display an error dialog box
Return Values: NONE
FError
	.x	error message to generate, or 0 to abort


MODscrn

Introduction: Module to contain some common screen controls.

Functions:

Clear Screen : Clear the screen with the standard GEOS fill pattern
Return Values: NONE
ClrScrn

OK Box Disply: Display an OK dialog box with a short message.
Return Values: NONE
OKBox
	A2	Pointer to string message to display
i_OKBox
	.word	Pointer to string message to display

CANCEL Box   : Display a CANCEL dialog box with a short message.
Return Values: NONE
CNCLBox
	A2	Pointer to string message to display
i_CNCLBox
	.word	Pointer to string message to display
Yes/No Box   : Display a Yes/No dialog box with a short message.
Return Values: NONE
YNBox
	A2	Pointer to string message to display
i_YNBox
	.word	Pointer to string message to display

OK/Cancel Box   : Display an OK/Cancel dialog box with a short message.
Return Values: NONE
OKCANBox
	A2	Pointer to string message to display
i_OKCANBox
	.word	Pointer to string message to display


MODvPrg

Introduction: Module to support VLIR applications with module loading/app init functions.

Functions:

Init VLIR    : Initialize VLIR application by reading in links.
Return Values: .x error message if any
InitVPrg
	A2	Pointer to application permanent name
i_InitVPrg
	.word	Pointer to application permanent name

Load module  : Swap a new code module into memory.
Return Values: .x error message if any
LdMod
	A2L	Module number to load in (1..2..3..)
i_LdMod
	.byte	Module number to load in (1..2..3..)

Virtual Jump  : Swap a new code module into memory and jump to an offset routine.
Return Values: .x error message if any
VJump
	A2L	Module number to load in (1..2..3..)
	A2H Offset from VPRGBase to execute (0,3,6,9,etc.)
i_VJump
	.byte	Module number to load in (1..2..3..)
	.byte	Offset from VPRGBase to execute (0,3,6,9,etc)



MODfbox

Introduction: Module to support all major opening file screens for a workfile based application. This includes the standard OPEN an existing file/CREATE a new file/QUIT to deskTop. The Open/Create screens screens include fully functional DISK/DRIVE icons which are sensitive to the application disk (see curDrive below), and to single drive systems. The Create box will check for already existing files. Auto-clicked filenames are also supported.

Functions:

Opening Box  : Handle all opening screens as described in introduction.

Return Values: A5 - the filename created or selected
               curDrive - the drive the file was opened from/created
               sysDBData - $00 if create done, $ff if open
FileBox
        A2      Pointer to any extra display code besides the opening screen.
        A3      Pointer to any clean up code for the A2 routine
        A4      Pointer to the permanent name for data files
        A5      Pointer to destination for opened/created file name
        curDrive the application drive (no DISK icon will appear on this drive)



MODseqW

Introduction: The creation of standard commodore sequential and program files is supported here as well as writing to them. All write/file buffers are maintained internally. Only one open file is supported at present.

Functions:

Create SF    : Create the file on disk and prepare for writing
Return Values: .x error message if any
CreatSF
	A2	Pointer to seq file name
i_CreatSF
	.word	Pointer to seq file name

Put S Byte   : Output a single character to the current file
Return Values: .x error message if any
PutSByte
	A2L	Character to output
i_PutSByte
	.byte	Character to output

Put S String : Output a null-terminated string to the current file
Return Values: .x error message if any
PutSString
	A2	Pointer to the string to output
i_PutSString
	.word	Pointer to the string to output

Put S Buffer : Output a buffer of data to the current file
Return Values: .x error message if any
PutSBuf
	A2	Pointer to the buffer to output
	A3	Number of bytes in the buffer
i_PutSBuf
	.word	Pointer to the buffer to output
	.word	Number of bytes in the buffer

Put S Memory : Output a block of memory to the current file
Return Values: .x error message if any
PutSMem
	A2	Pointer to the buffer to output
	A3	Pointer to the last byte in the buffer
i_PutSMem
	.word	Pointer to the buffer to output
	.word	Pointer to the last byte in the buffer

Copy filename: Copy an $a0 terminated string to a standard one
Return Values: none
CpyFName
	A2	Pointer to filename
	A3	Pointer to destination

Fname Uppcase: Make an $a0 terminated string uppercase (for C= files)
Return Values: none
MakeFNUpp
	A2	Pointer to filename

Close SF     : Close the last page in the geoWrite file and close the file.
Return Values: .x error message if any
ClosSF
	A2L	File type to save as
i_ClosSF
	.byte	File type to save as



MODgeoWx

Introduction: This module supports the creation and SEQUENTIAL writing of genuine geoWrite 2.0 style files. This version is compatible with MODvPrg above, meaning that the file will remain open no matter what virtual block of code is loaded into memory. However, this means that all the standard disk block buffers ($8000-$8300) were extensively used. Pictures are also supported, as well as auto-matic page breaking after 65 lines.

Functions:

Create WF    : Create the geoWrite file on disk and prepare the first page
Return Values: .x error message if any
CreatWF
	A2	Pointer to geoWrite file name
i_CreatWF
	.word	Pointer to geoWrite file name

Put W Byte   : Output a single character to the current page
Return Values: .x error message if any
PutWByte
	A2L	Character to output
i_PutWByte
	.byte	Character to output

Put W String : Output a null-terminated string to the current page
Return Values: .x error message if any
PutWString
	A2	Pointer to the string to output
i_PutWString
	.word	Pointer to the string to output

Put W Buffer : Output a buffer of data to the current page
Return Values: .x error message if any
PutWBuf
	A2	Pointer to the buffer to output
	A3	Number of bytes in the buffer
i_PutWBuf
	.word	Pointer to the buffer to output
	.word	Number of bytes in the buffer

Put W Memory : Output a block of memory to the current page
Return Values: .x error message if any
PutWMem
	A2	Pointer to the buffer to output
	A3	Pointer to the last byte in the buffer
i_PutWMem
	.word	Pointer to the buffer to output
	.word	Pointer to the last byte in the buffer

Put W Picture: Output a photo-scrap picture to the current page.  Picture scrap
               should be organized as .byte width, .byte height, and then the data.
Return Values: .x error message if any
PutWPic
	A2	Pointer to the scrap to output
	A3	Pointer to the last byte in the buffer
i_PutWPic
	.word	Pointer to the scrap to output
	.word	Pointer to the last byte in the buffer

geoWrite Page: Close the current page and start a new page (Next Page).
Return Values: .x error message if any
GWPage

Close WF     : Close the last page in the geoWrite file and close the file.
Return Values: .x error message if any
CloseWF
	A2	Pointer to geoWrite file name
i_CloseWF
	.word	Pointer to geoWrite file name



MODseqR

Introduction: The reading of standard commodore sequential and program files is supported here. All read/file buffers are maintained internally. Only one open file is supported at present.

Functions:

Open SF    : Open the sequential file for reading.
Return Values: .x error message if any
OpenSF
	A2	Pointer to file name
	A3L	Drive search flag, 0=current only
i_OpenSF
	.word	Pointer to file name
	.byte	Drive search flag, 0=current only

Get S Byte   : Input a single character from the current file
Return Values: .a byte read in, .x error message if any
GetSByte

Get S String : Input a null-terminated string from the current file
Return Values: String where designated, .x error message if any
GetSString
	A2	Pointer to the string destination buffer
i_GetSString
	.word	Pointer to the string destination buffer

Get S Buffer : Input a buffer of data from the current file
Return Values: Data at designated place, .x error message if any
GetSBuf
	A2	Pointer to the buffer for input
	A3	Maximum number of bytes to read in
i_GetSBuf
	.word	Pointer to the buffer for input
	.word	Maximum number of bytes to read in

Get S Memory : Input a block of memory from the current file
Return Values: Data at designated place, .x error message if any
GetSMem
	A2	Pointer to the buffer for input
	A3	Pointer to the last byte in the buffer
i_GetSMem
	.word	Pointer to the buffer for input
	.word	Pointer to the last byte in the buffer



MODsecIO

Introduction: This module supports reading from and writing to direct disk sectors in clumps. Only useful for disk archiver so far, but I may find another use in the future.

Functions:

SectorIO Init: Open the disk for reading/writing
Return Values: .x error message if any
SecIOinit
	.a	Device/Drive to Open
i_SecIOinit
	.byte	Device/Drive to Open

PutWholeTrack: Write an entire track out from the buffer
Return Values: .x error message if any
PutWTrk
	A2	Pointer to track buffer
	TRACK	Pre-set
i_PutWTrk
	.word	Pointer to track buffer
	TRACK	Pre-set

ReadWholeTrak: Read an entire track into a buffer
Return Values: Data where designated, .x error message if any
ReadWTrk
	A2	Pointer to the destination buffer
	A3	Buffer end byte pointer
	TRACK	Pre-set
i_ReadWTrk
	.word	Pointer to the destination buffer
	.word	Buffer end byte pointer
	TRACK	Pre-set

Read Sectors : Read as many sectors as will fit in the buffer
Return Values: Data where designated, .x error message if any
ReadSecs
	A2	Pointer to the destination buffer
	A3	Buffer end byte pointer
	TRACK	Pre-set
	SECTOR	Pre-set
i_ReadSecs
	.word	Pointer to the destination buffer
	.word	Buffer end byte pointer
	TRACK	Pre-set
	SECTOR	Pre-set

Write Sectors: Write as many sectors as fit in the buffer
Return Values: .x error message if any
WriteSecs
	A2	Pointer to the source buffer
	A3	Buffer end byte pointer
	TRACK	Pre-set
	SECTOR	Pre-set
i_WriteSecs
	.word	Pointer to the source buffer
	.word	Buffer end byte pointer
	TRACK	Pre-set
	SECTOR	Pre-set



MODgeoRx

Introduction: Given a particular window size, this module supports displaying and navigating the pages of a geoWrite document. Coded so far is support for Fonts, pictures, styles, and rulers.

Functions:

Init geoRead : Initialize the module for geoWrite file reading
Return Values: .x error message if any
InitGeoR
	A2	Pointer to font buffer
	A3	Size of font buffer
	A4	Pointer to page buffer
	A5	Size of page buffer
	A6	Pointer to pages buffer
i_InitGeoR
	.word	Pointer to font buffer
	.word	Size of font buffer
	.word	Pointer to page buffer
	.word	Size of page buffer
	.word	Pointer to pages buffer

Open geoW doc: Open a geoWrite document for reading
Return Values: .x error message if any
OpenGeoR
	A2	Pointer to the file name
	A3L	Top row of window
	A3H	Bottom row of window
	A4	Left col of window
	A5	Right col of window
i_OpenGeoR
	.word	Pointer to the file name
	.byte	Top row of window
	.byte	Bottom row of window
	.word	Left col of window
	.word	Right col of window

Load page   : Read current geoWrite doc page into memory
Return Values: .x error message if any
LoadGPg
i_LoadGPg

Show page   : Show current geoWrite doc page on screen
Return Values: .x error message if any
ShowGPg
i_ShowGPg

Previous page: Read previous geoWrite doc page into memory
Return Values: .x error message if any
PrevGPg
i_PrevGPg

Next page   : Read next geoWrite doc page into memory
Return Values: .x error message if any
NextGPg
i_NextGPg




MODtbox

Introduction: Supports the maintenance of one or more text boxes which may have character limits for both input and display, and also may be more than one line.

Functions:

Open TextBox : Begin taking input from a text box
Return Values: Data in appropriate buffer
OpenTBox
	A2	Pointer to text buffer
	A3L	Maximum number of lines
	A3H	Maximum number of characters
	R2-R4	Dimensions of the input buffer
i_OpenTBox
	.word	Pointer to text buffer
	.byte	Maximum number of lines
	.byte	Maximum number of characters
	R2-R4	Dimensions of the input buffer

Print TextBox: Display the text in a text box
Return Values: none
PrintTBox
	A2	Pointer to text buffer
	A3L	Maximum number of lines
	A3H	Maximum number of characters
	R2-R4	Dimensions of the input buffer
i_PrintTBox
	.word	Pointer to text buffer
	.byte	Maximum number of lines
	.byte	Maximum number of characters
	R2-R4	Dimensions of the input buffer

Close TextBox: Remove focus from a text box
Return Values: none
TBoxClose

ResumeTextBox: If a text box has been closed, this routine resumes entry without reopening
Return Values: none
TBoxResume



MODdemo

Introduction: For a special edition of ChromeMag, I received permission from LoadStar to republish many of my old GEOS programs. To encourage people to actually purchase the edition of LoadStar from which these programs came, I added code that would mark both the disk and the file with a counter. The same code then used the counter to enforce a limit on the number of times the program would run.

Functions:

Set Demo     : Evaluate whether the limit of execution for this program has expired.
Return Values: .x $0 means the program may execute, $ff means it may not
SetDemo
	A2	Name of the executable
	A3L	Identifying code number (from $bd - $dc)
	A3H	Maximum number of times to run
i_SetDemo
	.word	Name of the executable
	.byte	Identifying code number (from $bd - $dc)
	.byte	Maximum number of times to run



MODconvert

Introduction: The Convert series of applications has long been a staple in the GEOS world, allowing the non-standard GEOS formatted file to be changed into a more standard sequential style file, and back again. This allows the files to be easily transmitted between different computers. This module contains the basic functionality of that process.

Functions:

Convert      : Convert a GEOS file to a .CVT file (sequential format)
Return Values: .x $0 is ok, $ff means that the file was not a GEOS file, and other is error.
Convert
	A2	Name of GEOS file to convert
i_Convert
	.word	Name of GEOS file to convert

unConvert    : Convert a .CVT (sequential format) file back to the GEOS format.
Return Values: .x $0 is ok, $ff means that the file was not a .CVT file, and other is error.
unConv
	A2	Name of .CVT file to unconvert
i_Convert
	.word	Name of .CVT file to unconvert


MODfcopy

Introduction: Quite simply, this module supports copying of a file of any file type between two drives. The copy buffer must be supplied by the application, and must be between 3 and 126 blocks long.

Functions:

FileCopy     : Copy a file from the current drive to a given destination drive.
Return Values: .x $0 is ok, other is a disk error
FileCopy
	A2	Name of the source file
	A3	Name of the destination file
	A4	Address of the beginning of the copy buffer
	A5	Address of the end of the copy buffer (+1)
	A6L	The destination drive device number
i_FileCopy
	.word	Name of the source file
	.word	Name of the destination file
	.word	Address of the beginning of the copy buffer
	.word	Address of the end of the copy buffer (+1)
	.byte	The destination drive device number