W65C02_Board

Ben Eater board with Nick's G-Pascal Compiler

Press the green NMI button on start-up

G-Pascal compiler, version 4.07.
Written by Nick Gammon.
Type H for help.
:

---

Features :

• W65C02 microcontroller with Nick Gammon G-Pascal ROM ;

• 32 KiB EPROM for G-Pascal ;

• 28 KiB RAM ;

• Integrated VIA 6522 ;

• SPI

• I2C

• ORIC-1 compatible expansion connector ;

• Address decoding with a GAL22V10 ;

• USB serial interface with FTDI232 module ;

• Gerber file available.

• The GAL JED file is generated using the utility GALasm under linux.

• The programmer used is a XGECU - pro

• It is capable of programming E(E)PROMs, and Lattice GAL22V10.

---

ROM Configutration :

In gpascal.asm HIGHEST_RAM is $6FFF,

gpascal_0x6fff.bin was generated for the 27c256 EPROM

;
;  CONFIGURATION
;
CLOCK_RATE   = 1000000   ; 1 Mhz
START_OF_ROM = $8000     ; where the ROM chip starts
HIGHEST_RAM  = $6FFF    ; with GAL22V10

---

Peripheral Address :

Peripheral	start address	end address
RAM	#0000	#6FFF
EPROM (27C256)	#8000	#FFFF
VIA	#7FF0	#7FFF
IO1	#7FE0	#7FEF
IO2	#7FD0	#7FDF
IO3	#7FC0	#7FCF
IO4	#7FB0	#7FBF

---

hardware

Original Schematics

Dedicated ports on the via 6522

---

Schematics with Nick's modifications

• Beware : with old via MOS6522 R4=100 ohms

---

Few programs examples (4800 bauds 1MHz clock)

Interactive demo

CPU straps :

For W65C02 microcontroller :

• J7 : open
• J11 : short
• J2 : open
• J3 : short

For MOS 6502 microcontroller (No compatibility with G-Pascal ROM):

• J7 : short
• J11 : open
• J2 : short
• J3 : open

---

Usefull links

• Nickgammon G-Pascal main page

• Nickgammon G-Pascal github

• Nickgammon G-Pascal info

• Nickgammon ASM info

• Ben Eater Build a 6502 computer

• Build your own ORIC ATMOS

---

G-Pascal compiler, version 4.07.
Written by Nick Gammon.
Type H for help.
: h

Available actions:

Delete      line_number_range
Insert/LOad after_line
Find        line_number_range /target/flags
List/SAve   line_number_range
Replace     line_number_range /target/replacement/flags
RECover
---
Help
INFo
Memory      first_address last_address
Assemble
Compile/Syntax
DEBug/Trace
LIBrary
Poke/Jsr/JMp
RUn
RESume
(Actions may be abbreviated)
(Flags: 'I'gnore case, 'G'lobal, 'Q'uiet)
: