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1983-09-30
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2KB
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103 lines
Flight Simulator RGB Modifications
By: Andrew Tuline
CIS: 70465,1223
The modifications included herein will allow an RGB
monitor to show some colours using the Flight Simulator program.
This modification is not perfect, nor is is very well tested.
The user should make a copy of their Flight Simulator program
using their favourite technique. As we know even the most
obvious methods may elude us. Anyways, one of the bugs is, when
the user enters the slew mode, the modifications are nullified.
Basically, the technique is to intercept the disk vector and
setup a port for the colour display adapter for the needed
values. I certainly hope, that by disclosing this technique,
Microsoft doesn't skin my hide. Anyways to modify your extra
spare disk, boot up debug in DOS 2.0 and type the following:
Note: you need a system with at least 96K to use this
modification as is.
L CS:0 0 0 1 (FLIGHT SIMULATOR DISK IN DRIVE A)
A 0
mov ax,201
mov dx,0
mov CL,2
mov ch,27
mov bx,1000
mov es,bx
xor bx,bx
int 13
jmp 1000:0
W CS:0 0 0 1
L CS:0 0 139 1 (FLIGHT SIMULATOR DISK IN DRIVE A)
A 0
push cs
pop ds
mov ax,0
mov es,ax
es:
mov ax,[4c]
mov [70],ax
es:
mov ax,[4e]
mov [72],ax
mov ax,48
es:
mov [4c],ax
es:
mov [4e],cs
cli
xor ax,ax
mov ds,ax
mov es,ax
mov ss,ax
mov sp,c0b0
mov cx,200
mov SI,7c00
mov DI,500
sti
repz
movsb
jmp 0:7c18
a 48
pushf
push cs
cs:
mov [74],ax
mov ax,5b
push ax
cs:
mov ax,[74]
jmp F000:EC59 <- this is also saved at 1000:0070
pushf
push ax
push dx
mov dx,3d8
mov AL,0a
out dx,AL
inc dx
mov AL,20
out dx,AL
pop dx
pop ax
popf
iret
W CS:0 0 139 1
The value 20 a couple of lines up sets up the colours for low
intensity cyan/magenta/white. Good luck, and may the colours
be with you!