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Text File | 1992-06-13 | 14.2 KB | 378 lines

**************************** VIDEO MODES *********************************** ASMLIB video mode subroutines (c) Copyright 1991 Douglas Herr All rights reserved ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ HGRAPH: establishes Hercules graphics mode, pages 0 & 1 HGRAPH0: establishes Hercules graphics mode, clear page 0 only Source: hgraph.asm (a$herc.asm, hmode.asm) Hercules or compatible required (including Hercules InColor) Call with: no parameters Returns: if CF = 1, no Hercules installed if CF = 0, AX = code for Hercules model 128 = HGC 144 = HGC+ 208 = InC Uses: AX, CX, CF Supports: Hercules graphics cards and compatibles: graphics mode see also Use64k in SYSTEM.DOC Example: call hgraph ; establish graphics mode jc no_hercules ; drat! ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ HRAM8043: establish an 80-column, 43-row RamFont mode, loading a standard 8x8 character font in RAM Source: hram8043.asm (a$herc.asm, hmode.asm, hload8x8.asm) HRAM9025: establish a 90-column, 25-row RamFont mode using standard ROM characters Source: hram9025.asm (a$herc.asm, hmode.asm) HRAM9043: establish a 90-column, 43-row RamFont mode, loading a standard 8x8 character font in RAM Source: hram9043.asm (a$herc.asm, hload8x8.asm, hmode.asm) Hercules RamFont card required (including Hercules InColor) Note: use htext to restore normal 80 x 25 text mode Call with: no parameters Returns: if CF = 1, no RamFont card installed if CF = 0, AX = code for Hercules model 144 = HGC+ 208 = InC Uses: AX, CF; all other flags and registers are saved Supports: HGC+ and InC cards: 4k RamFont mode Example: call hram8043 ; RamFont mode: 80x43 jc no_ramfont ; drat! ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ HTEXT: establish (or restore) Hercules text mode Source: htext.asm (a$herc, hmode) Call with: no parameters Returns: if CF = 1, no Hercules installed if CF = 0, AX = code for Hercules model 128 = HGC 144 = HGC+ 208 = InC Uses: AX, CF Supports: Hercules graphics cards and compatibles: text mode (including Hercules InColor) Example: call htext ; Hercules text mode jc no_herc ; drat! ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ MODE13243: switches supported systems to 132 column, 43 row text mode MODE13225: switches supported systems to 132 column, 25 row text mode Source: mode132.asm (isevga.asm) Call with: AX = SuperEGA/VGA code returned by IsSEVGA Returns: CF = 1 if mode not supported if CF = 0, AX = mode number Uses: AX, CF; all other registers and flags are saved Supports: Equipment detected by IsSEVGA (see IsSEVGA in SYSTEM.DOC). Most VGA boards require a multi-frequency monitor to use 132-column modes; consult your board's documentation. The Paradise EGA 480 requires an EGA monitor; the Everex EGA works with Monochrome and EGA monitors, and the 25-row mode also works with a CGA monitor. Example: call issevga ; test for Super EGA or Super VGA jc no132 ; no good - skip call mode13243 ; set mode jc no132 ; no good . . . ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ MODECOLOR: switches system to color text mode; may be used to switch monitors on a 2-monitor system, or to switch to the standard 80-column, 25-rows color mode from other color modes Source: mode.asm (find6845.asm) Call with: no parameters Returns: CF = 1 if no color monitor CF = 0 if successful Uses: CF; all registers and all other flags are saved Example: call modecolor jc nocolor . . . ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ MODEMONO: switches system to monochrome text mode; may be used either to switch active monitors on a 2-monitor sysem or to switch to monchrome text mode (80x25) from graphics mode (EGA or Hercules). Source: mode.asm (find6845.asm) Call with: no parameters Returns: CF = 1 if no monochrome monitor CF = 0 if successful Uses: CF; all registers and all other flags are saved Example: call modemono jc nomono . . . ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ MODE43: switch EGA to 80x43 text mode or VGA to 80x50 text mode Mode43 switches an EGA to the 80-column, 43-row text mode from any color mode or any EGA monochrome mode, or switches a color VGA to 80x50 text mode from any other color mode. Source: mode43.asm Call with: no parameters Returns: if CF = 1, AX = 0 if no EGA or VGA in system AX = -1 if EGA connected to CGA monitor if CF = 0, AX = 3 if EGA or VGA connected to color monitor AX = 7 if EGA or VGA connected to monochrome monitor Uses: AX, CF; all other registers and flags are saved Example: call mode43 jc noega ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ SUPER13: changes standard VGA systems to an undocumented 320x400 256-color graphics mode. ASMLIB supports 2 graphics pages in this mode. See also XModeClear. Source: super13.asm (a$graph.asm) Call with: no parameters Returns: if CF = 1, no VGA installed if CF = 0, all OK Uses: AX, CF Supports: VGA only: graphics mode Example: call super13 jc oops ; do something else if no VGA ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ SUPER13A: an undocumented 360x480 256-color mode for any VGA system. One page is available in this mode. See Super13 for example. ASMLIB graphics subroutines recognize this mode. Super13a is based on John Bridges' code and parameters. Source: super13a.asm Call with: no parameters Returns: if CF = 1, no VGA installed if CF = 0, all OK Uses: AX, flags Supports: VGA only: graphics mode Example: call super13a jc oops ; do something else if no VGA ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ SVGA16: set Super VGA mode Source: svga16.asm (banks.asm) Call with: AX = 16-color mode desired AX = 0 for 800x600 AX = 1 for 1024x768 !! DO NOT USE ANY VALUE FOR AX OTHER THAN 0 OR 1 !! ASMLIB's SVGA subroutines are derived from John Bridges' public domain VGAKIT board identification and bank switching code. Boards supported are: Ahead Technologies ATI Chips & Technologies Everex Genoa GVGA NCR Oak Technologies Paradise (Western Digital) Trident Trident 8900 Tseng (Genoa, Orchid, Willow) Tseng 4000 VESA standard (800x600 only) Video 7 Returns: AX = mode number if AX = 0, requested mode is not available SVGA16 cannot determine if the monitor you are using will work with the requested mode. Monitor damage may result from improper use of SVGA16. Example: include asm.inc public mygraph extrn whichvga:proc, extrn svga16:proc .code mygraph proc ; I want to use a 16-color 1024x768 mode if available ; start by calling WhichVGA to determine if the equipment is capable call whichvga or ax,ax ; SuperVGA installed? jz no_svga ; nope, use some other mode mov ax,1 ; specify 1024x768 mode call svga16 ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ SVGA256: set Super VGA 256-color mode Source: svga256.asm (banks.asm) Call with: AX = 256-color mode desired AX = 0 for 640x400 AX = 1 for 640x480 AX = 2 for 800x600 AX = 3 for 1024x768 !! DO NOT USE ANY AX VALUES OTHER THAN 0, 1, 2 & 3 !! ASMLIB's SVGA subroutines are derived from John Bridges' public domain VGAKIT board identification and bank switching code. Equipment supported is listed under SVGA16, plus: Compaq (640x480 only) Returns: AX = mode number if AX = 0, requested mode is not available SVGA256 cannot determine if the monitor you are using will work with the requested mode. Monitor damage may result from improper use of SVGA256. Example: see SVGA16 ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ XMODE16: establish SuperEGA/SuperVGA graphics mode and configure ASMLIB graphics subroutines to work with the mode. XMODECLEAR: restore ASMLIB's default graphics configuration Source: xmode16.asm, a$graph.asm Parameters: maximum x, maximum y, registers as required to set mode. XMode16 assumes that the mode is set with AH = 0. Returns: nothing Uses: All registers and flags saved. Supports: 16-color EGA/VGA-style graphics modes, up to 800 x 600 pixels. Various equipment. You must have the required equipment and use the correct mode number; hardware damage may result from improper use of XMode16. I cannot be held responsible for damage resulting from use or misuse of XMode16. Use XMode16 if your equipment is not supported by SVGA16. If 800 horizontal pixels are available, maxX% should be 799. Similarly, if 600 vertical pixels are possible, maxY% should be 599. Your graphics card manual lists mode numbers, monitor requirements, and the number of horizontal and vertical pixels corresponding to the mode. Mode numbers are usually in hex format. Some modes and corresponding mode numbers are listed on the next pages. Equipment mode mode number Example Orchid ProDesigner 800x600 29h mov ax,799 STB EM/16 push ax Genoa mov ax,599 Sigma X16 push ax (Tseng chip set) mov al,29h call xmode16 Everex MED EGA 640X480 AL = 70h, BL = 00h (Micro Enhancer Deluxe) 752x410 AL = 70h, BL = 01h mov ax,751 push ax mov ax,409 push ax mov al,70h mov bl,01h call xmode16 ATI VGA Wonder 800x600 54h mov ax,799 push ax mov ax,599 push ax mov al,54h call xmode16 ATI VIP 800x560 53h mov ax,799 push ax mov ax,559 push ax mov al,53h call xmode16 (continued) Paradise Plus-16 800x600 58h mov ax,799 Paradise Professional push ax mov ax,599 push ax mov al,58h call xmode16 Video 7 Fastwrite 800x600 62h mov ax,799 Video 7 VRAM push ax mov ax,599 push ax mov al,62h call xmode16 Western Digital 800x600 6Ah (color) mov ax,799 6Bh (mono) push ax (VESA modes) mov ax,599 push ax mov al,6Ah ; color call xmode16 If any of this information conflicts with the specifications in your video card's instruction manual, the manual's recommendation is a safer bet. Note that all the above modes require a multi-frequency monitor. When you're all done with Graphics mode, CALL ModeColor to return to 80x25 text mode, and CALL XModeClear to reset ASMLIB's graphics mode flags.