ghaerr · ghaerr · Oct 26, 2025 · Oct 26, 2025
diff --git a/Documentation/text/boot.txt b/Documentation/text/boot.txt
@@ -137,7 +137,7 @@ ELKS "INITSEG" (setup data segment) offsets:
 | Hex  | Dec | Size | Name              | Description              | Where set
 +------+-----+------+-------------------+--------------------------+------------
 | 0007 |   7 | byte | screen_cols       | screen width             | setup.S
-| 000E |  14 | byte | screen_lines      | screen height            | setup.S
+| 000E |  14 | byte | screen_lines      | UNUSED                   |
 | 0020 |  32 | byte | cpu_type          | UNUSED                   |
 | 002A |  42 | word | mem_kbytes        | base memory size in K    | setup.S
 | 0030 |  48 |16byte| proc_name         | UNUSED                   |

diff --git a/Documentation/text/porting-guide.txt b/Documentation/text/porting-guide.txt
@@ -1,6 +1,6 @@
 ELKS Porting Guide
 ==================
-21 June 2022 - Rev 4 ghaerr
+26 Oct 2025 - Rev 5 ghaerr
 
 Platforms (target)
 -------------------------------------------------
@@ -98,7 +98,7 @@ BIOS Console
 ------------
 	BIOS Console using BIOS only				console-bios.c
 		SETUP_VID_COLS      setupb(7)
-		SETUP_VID_LINES     setupb(14)
+		SETUP_VID_LINES     25
 		BDA:0x49    VID_MODE (7=MDA, force 1 console)
 	All INT 10h and INT 16h BIOS Console routines  console-bios-asm.S
 		INT 16h AH=01h  Poll kbd
@@ -165,9 +165,6 @@ INT 10h AH=0Eh Write teletype current page		CONFIG_CONSOLE_HEADLESS
 		boot_sect.S, setup.S, conio-bios.S
 INT 10h AH=0Fh Get video mode					CONFIG_ARCH_IBMPC, setup.S
 
-INT 10h AH=12h Get EGA video configuration		CONFIG_HW_VGA
-INT 10h AH=1Ah Get VGA video configuration		CONFIG_HW_VGA
-
 INT 12h        Get memory in kilobytes			boot_sect.S, setup.S
 
 INT 13h AH=00h Reset disk system				CONFIG_BLK_DEV_BIOS, boot_sect.S

diff --git a/Documentation/text/rom_configuration.txt b/Documentation/text/rom_configuration.txt
@@ -32,12 +32,6 @@ OS/loader function.
   Systems with SIO console doesn't need a keyboard BIOS
 
 
-'System has a VGA-adapter'        CONFIG_HW_VGA
---------------------------------------------
-
-  No search to VGA
-
-
 'System has a PS/2 pointing device'   CONFIG_HW_PS2_MOUSE
 ------------------------------------------------------
 

diff --git a/blink16.config b/blink16.config
@@ -15,7 +15,6 @@
 CONFIG_ARCH_IBMPC=y
 # CONFIG_ARCH_8018X is not set
 # CONFIG_ARCH_PC98 is not set
-CONFIG_HW_VGA=y
 # CONFIG_HW_SERIAL_FIFO is not set
 
 #

diff --git a/elks/arch/i86/boot/setup.S b/elks/arch/i86/boot/setup.S
@@ -39,12 +39,12 @@
 ! index
 !	...
 !	4:	display page, 1 byte UNUSED
-!	6:	video mode, 1 byte
+!	6:	video mode, 1 byte UNUSED
 !	7:	screen_cols, 1 byte
-!	8:	video data, 2 bytes
-!	10:	mono/color, video memory size, 2 bytes 
-!	14:	screen_lines, 1 byte
-!	15:	VGA present, 1 byte
+!	8:	video data, 2 bytes UNUSED
+!	10:	mono/color, video memory size, 2 bytes UNUSED
+!	14:	screen_lines, 1 byte UNUSED
+!	15:	VGA present, 1 byte UNUSED
 !	0x20:	cpu_type	byte Processor type
 !			0  = 8088
 !			1  = 8086
@@ -893,44 +893,14 @@ arch_get_mem:
 	ret
 
 // Set INITSEG values for IBM PC
-// Determine display type using INT 10h AH=12 and INT 10h AH=1A
-// Get display page and mode using INT 10h AH=0F
+// Get display columns using INT 10h AH=0F
 // Determine size of main memory using INT 12h
 // FIXME move to separate setup-bios.S file or individual drivers
 
 arch_set_initseg:
-
-#ifdef CONFIG_HW_VGA
-// check for EGA/VGA and some config parameters
-	mov	$0x12,%ah	// Get video data
-	mov	$0x10,%bl
-	int	$0x10
-	mov	%ax,8
-	mov	%bx,10
-	mov	%cx,12
-	mov	$0x5019,%ax
-	cmp	$0x10,%bl
-	je	novga
-	mov	$0x1a00,%ax	// Added check for EGA/VGA discrimination
-	int	$0x10
-	mov	%ax,%bx
-	mov	$0x5019,%ax
-	movb	$0,15		// by default, no VGA
-	cmp	$0x1a,%bl	// 1a means VGA, anything else EGA or lower
-	jne	novga
-	movb	$1,15		// we've detected a VGA
-#else
-        movb  $0,15		// no VGA in system
-        mov   $25,%al		// height of display in rows
-#endif /* CONFIG_HW_VGA*/
-
-novga:	mov	%al,14		// CGA 25 rows
-
-// Get video-card data
-
-	mov	$0x0f,%ah
+	mov	$0x0f,%ah       // get video state
 	int	$0x10
-	mov	%ax,6		// al = video mode, ah = window width
+	mov	%ah,7		// ah = video columns
 
 	call	getcpu		// implemented in cputype.S
 

diff --git a/elks/arch/i86/defconfig b/elks/arch/i86/defconfig
@@ -28,7 +28,6 @@ CONFIG_ARCH_IBMPC=y
 #
 # Devices
 #
-CONFIG_HW_VGA=y
 CONFIG_HW_SERIAL_FIFO=y
 
 #

diff --git a/elks/config.in b/elks/config.in
@@ -21,7 +21,6 @@ mainmenu_option next_comment
 
 		comment 'Devices'
 
-		bool 'VGA adapter'      CONFIG_HW_VGA       y
 		bool 'Serial port FIFO' CONFIG_HW_SERIAL_FIFO y
 
 	elif [ "$CONFIG_ARCH_8018X" = "y" ]; then

diff --git a/elks/include/linuxmt/config.h b/elks/include/linuxmt/config.h
@@ -23,7 +23,7 @@
 #ifdef CONFIG_ARCH_IBMPC
 #define MAX_SERIAL              4               /* max number of serial tty devices*/
 #define SETUP_VID_COLS          setupb(7)       /* BIOS video # columns */
-#define SETUP_VID_LINES         setupb(14)      /* BIOS video # lines */
+#define SETUP_VID_LINES         25              /* video # lines */
 #define SETUP_CPU_TYPE          setupb(0x20)    /* processor type */
 #define SETUP_MEM_KBYTES        setupw(0x2a)    /* base memory in 1K bytes */
 #define SETUP_XMS_KBYTES        setupw(0x1ea)   /* xms memory in 1K bytes */
@@ -51,9 +51,9 @@
 #endif /* CONFIG_ARCH_IBMPC */
 
 #ifdef CONFIG_ARCH_PC98
-#define MAX_SERIAL              1       /* max number of serial tty devices*/
-#define SETUP_VID_COLS          80      /* video # columns */
-#define SETUP_VID_LINES         25      /* video # lines */
+#define MAX_SERIAL              1               /* max number of serial tty devices*/
+#define SETUP_VID_COLS          80              /* video # columns */
+#define SETUP_VID_LINES         25              /* video # lines */
 #define SETUP_CPU_TYPE          setupb(0x20)    /* processor type */
 #define SETUP_MEM_KBYTES        setupw(0x2a)    /* base memory in 1K bytes */
 #define SETUP_XMS_KBYTES        setupw(0x1ea)   /* xms memory in 1K bytes */

diff --git a/elkscmd/nano-X/Makefile b/elkscmd/nano-X/Makefile
@@ -24,15 +24,15 @@ ifeq ($(CONFIG_ARCH_IBMPC), y)
 DRIVERS += drivers/mou_ser.o drivers/kbd_tty.o
 DRIVERS += drivers/mempl4.o drivers/elksutilasm.o
 
-ifeq ($(CONFIG_HW_VGA), y)
+# EGA/VGA screen driver
 DRIVERS += drivers/scr_bios.o drivers/vgaplan4.o
 DRIVERS += drivers/romfont.o drivers/elksutilasm.o
-else
-DRIVERS += drivers/scr_cga.o drivers/vgaplan4_cga.o
-DRIVERS += drivers/ramfont.o drivers/X6x13.o
-endif
 endif
 
+# CGA screen driver
+#DRIVERS += drivers/scr_cga.o drivers/vgaplan4_cga.o
+#DRIVERS += drivers/ramfont.o drivers/X6x13.o
+
 # high speed C VGA driver (BCC)
 #DRIVERS += drivers/elkplan4.o
 

diff --git a/elkscmd/nano-X/demos/nxtetris.h b/elkscmd/nano-X/demos/nxtetris.h
@@ -54,7 +54,7 @@
 #define TEXT_Y_POSITION 15
 #define TEXT2_Y_POSITION 30
 #define WELL_WIDTH 12
-#if defined(CONFIG_HW_VGA) || defined(CONFIG_ARCH_PC98)
+#if 1                   /* defined(CONFIG_HW_VGA) || defined(CONFIG_ARCH_PC98) */
 #define WELL_HEIGHT 28
 #define WELL_VISIBLE_HEIGHT 24
 #else

diff --git a/emu86-disk.config b/emu86-disk.config
@@ -13,7 +13,6 @@
 #
 
 CONFIG_ARCH_IBMPC=y
-CONFIG_HW_VGA=y
 # CONFIG_HW_SERIAL_FIFO is not set
 
 #

diff --git a/emu86-rom-full.config b/emu86-rom-full.config
@@ -13,7 +13,6 @@
 #
 
 CONFIG_ARCH_IBMPC=y
-# CONFIG_HW_VGA is not set
 # CONFIG_HW_SERIAL_FIFO is not set
 
 #

diff --git a/ibmpc-1440-nc.config b/ibmpc-1440-nc.config
@@ -17,7 +17,6 @@ CONFIG_ARCH_IBMPC=y
 # CONFIG_ARCH_PC98 is not set
 # CONFIG_HW_COMPAQFAST is not set
 # CONFIG_HW_MK88 is not set
-CONFIG_HW_VGA=y
 CONFIG_HW_SERIAL_FIFO=y
 
 #

diff --git a/ibmpc-1440.config b/ibmpc-1440.config
@@ -17,7 +17,6 @@ CONFIG_ARCH_IBMPC=y
 # CONFIG_ARCH_PC98 is not set
 # CONFIG_HW_COMPAQFAST is not set
 # CONFIG_HW_MK88 is not set
-CONFIG_HW_VGA=y
 CONFIG_HW_SERIAL_FIFO=y
 
 #
-Original file line number
+Diff line change
@@ Expand Up / @@ -28,7 +28,6 @@ CONFIG_ARCH_IBMPC=y @@
     #
     # Devices
     #
-    CONFIG_HW_VGA=y
     CONFIG_HW_SERIAL_FIFO=y
     #
@@ Expand Down @@