103 lines
1.8 KiB
Modula-2
103 lines
1.8 KiB
Modula-2
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Flight Simulator RGB Modifications
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By: Andrew Tuline
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CIS: 70465,1223
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The modifications included herein will allow an RGB
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monitor to show some colours using the Flight Simulator program.
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This modification is not perfect, nor is is very well tested.
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The user should make a copy of their Flight Simulator program
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using their favourite technique. As we know even the most
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obvious methods may elude us. Anyways, one of the bugs is, when
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the user enters the slew mode, the modifications are nullified.
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Basically, the technique is to intercept the disk vector and
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setup a port for the colour display adapter for the needed
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values. I certainly hope, that by disclosing this technique,
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Microsoft doesn't skin my hide. Anyways to modify your extra
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spare disk, boot up debug in DOS 2.0 and type the following:
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Note: you need a system with at least 96K to use this
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modification as is.
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L CS:0 0 0 1 (FLIGHT SIMULATOR DISK IN DRIVE A)
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A 0
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mov ax,201
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mov dx,0
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mov CL,2
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mov ch,27
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mov bx,1000
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mov es,bx
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xor bx,bx
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int 13
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jmp 1000:0
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W CS:0 0 0 1
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L CS:0 0 139 1 (FLIGHT SIMULATOR DISK IN DRIVE A)
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A 0
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push cs
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pop ds
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mov ax,0
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mov es,ax
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es:
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mov ax,[4c]
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mov [70],ax
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es:
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mov ax,[4e]
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mov [72],ax
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mov ax,48
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es:
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mov [4c],ax
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es:
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mov [4e],cs
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cli
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xor ax,ax
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mov ds,ax
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mov es,ax
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mov ss,ax
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mov sp,c0b0
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mov cx,200
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mov SI,7c00
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mov DI,500
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sti
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repz
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movsb
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jmp 0:7c18
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a 48
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pushf
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push cs
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cs:
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mov [74],ax
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mov ax,5b
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push ax
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cs:
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mov ax,[74]
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jmp F000:EC59 <- this is also saved at 1000:0070
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pushf
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push ax
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push dx
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mov dx,3d8
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mov AL,0a
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out dx,AL
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inc dx
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mov AL,20
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out dx,AL
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pop dx
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pop ax
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popf
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iret
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W CS:0 0 139 1
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The value 20 a couple of lines up sets up the colours for low
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intensity cyan/magenta/white. Good luck, and may the colours
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be with you!
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