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Date: Wednesday, October 7, 1998 12�1�11
From: St.Nick@stnick.net
Subj: Here's something you might want:
To: cturley2@aol.com
Here is the Source code to control the TWGS, ZipGS accelerators.
It is ORCA/C
St. Nick
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/*
* Speed.CC - Set CPU speed (current, normal, fast, accelerated)
*
* by Michael Guitton
*
* Original ASM code taken from GS+ AutoPilot by Josef W. Wankerl.
*
* Note : Speed.CC did not work reliably and crashed (!?) when
* optimized... This has been fixed today: I had forgotten
* rtl operation codes in asm functions!
*/
#pragma keep "speed"
#if 0
#define _DEBUG_
#pragma debug 25
#else
#pragma optimize -1
#endif
#include <stdio.h>
#include <stdlib.h>
#include <types.h>
/*- Speed Constants ---------------------------------------------------------*/
#if 0
#define Current 0x00 /* Current speed */
#endif
#define Normal 0x01 /* Normal speed */
#define Fast 0x02 /* Fast speed */
#define Maximum 0x03 /* Maximum speed */
#define None 0x00
#define TWGS 0x01
#define ZipGSX 0x02
/*
* Apple IIGS
*/
#define sysSpeed 0x0020
#define SpeedReg 0xE0C036 /* Apple IIGS speed register */
/*
* TransWarp
*/
#define TransWarpID 0xBCFF00 /* TransWarp GS ID bytes */
#define GetMaxSpeed 0xBCFF10 /* Get maximum TWGS speed frequency */
#define GetNumISpeed 0xBCFF14
#define GetCurSpeed 0xbcff20 /* Get TWGS speed based on frequency */
#define SetCurSpeed 0xBCFF24 /* Set TWGS speed based on frequency */
#define GetCurISpeed 0xbcff28 /* Get TWGS speed based on index */
#define SetCurISpeed 0xBCFF2C /* Set TWGS speed based on index */
#define GetTWConfig 0xBCFF3C
#define TW 0x5754 /* "WT" */
#define GS 0x5347 /* "SG" */
/*
* ZipGSX
*/
#define DisableZip 0x00 /* Turn Zip GS off */
#define UnlockZip 0x50 /* Unlock Zip GS registers */
#define LockZip 0xA0 /* Lock Zip GS registers */
#define GeneralReg 0xE0C059 /* Zip GS register */
#define LockReg 0xE0C05A /* Zip GS register */
#define EnableReg 0xE0C05B /* Zip GS register */
#define SetSpeedReg 0xE0C05D /* Zip GS register */
#if 0
#define zip100_00 0x00
#define zip93_75 0x01
#define zip87_50 0x02
#define zip81_25 0x03
#define zip75_00 0x04
#define zip68_75 0x05
#define zip62_50 0x06
#define zip56_25 0x07
#define zip50_00 0x08
#define zip43_75 0x09
#define zip37_50 0x0A
#define zip31_25 0x0B
#define zip25_00 0x0C
#define zip18_75 0x0D
#define zip12_50 0x0E
#define zip6_25 0x0F
#endif
/*- Typedefs ----------------------------------------------------------------*/
typedef unsigned char byte;
/*- Macros ------------------------------------------------------------------*/
#define ShortM sep #0x20
#define LongM rep #0x20
#define _WriteBParam ldx #0x0B03
#define ToolEntry 0xE10000
#define char2hex(c) (('0' <= (c) && (c) <= '9') ? ((c) ^ 0x30) :\
('A' <= (c) && (c) <= 'F') ? (((c) ^ 0x40) + 0x09) :\
('a' <= (c) && (c) <= 'f') ? (((c) ^ 0x60) + 0x09) : 0)
/*- Routines ----------------------------------------------------------------*/
asm void SlowGS(void)
{
pea 0x0000 ; Give normal IIGS speed indicator
pea sysSpeed ; Prepare to set system speed battery RAM
_WriteBParam
jsl ToolEntry ; Set battery RAM to indicate normal
ShortM ; Make accumulator 8 bits wide
lda >SpeedReg ; Get the IIGS speed register
and #0x7F ; Clear the fast bit
sta >SpeedReg ; Save the new IIGS speed register
LongM ; Make accumulator 16 bits wide
rtl
} /* SlowGS() */
asm void FastGS(void)
{
pea 0x0001 ; Give fast IIGS speed indicator
pea sysSpeed ; Prepare to set system speed battery RAM
_WriteBParam
jsl ToolEntry ; Set battery RAM to indicate fast
ShortM ; Make accumulator 8 bits wide
lda >SpeedReg ; Get the IIGS speed register
ora #0x80 ; Set the fast bit
sta >SpeedReg ; Save the new IIGS speed register
LongM ; Make accumulator 16 bits wide
rtl
} /* FastGS() */
byte FindTWGS(void)
{
byte found = 0;
asm {
lda >TransWarpID ; Get TWGS low ID word
cmp #TW ; Check against real TWGS low ID
bne ExitFindTWGS ; If no ID found, exit
lda >TransWarpID+2 ; Get TWGS high ID word
cmp #GS ; Check against real TWGS high ID
bne ExitFindTWGS ; If no ID found, exit
inc found ; Got a better idea?
}
ExitFindTWGS: return found;
} /* FindTWGS() */
asm void SlowTWGS(void)
{
ldx #0x0000 ; Prepare to switch to normal speed
jsl >SetCurISpeed ; Switch to normal speed
rtl
} /* SlowTWGS() */
asm void NoTWGS(void)
{
ldx #0x0001 ; Prepare to switch to fast speed
jsl >SetCurISpeed ; Switch to fast speed
rtl
} /* NoTWGS() */
asm void FastTWGS(void)
{
jsl >GetMaxSpeed ; Find TWGS maximum speed
jsl >SetCurSpeed ; Switch to maximum speed
rtl
} /* FastTWGS() */
byte FindZip(void)
{
byte found = 0;
asm {
ShortM ; Make accumulator 8 bits wide
lda #UnlockZip ; Prepare to unlock the Zip registers
sta >LockReg ; Store the unlock value...
sta >LockReg ; ...four times to make the...
sta >LockReg ; ...Zip registers available...
sta >LockReg ; ...for tampering
ldy #0x00AE ; Prepare to cache the code
CacheThis: lda CacheThis,y ; Cache code
dey ; Decrement cache counter
bne CacheThis ; Cache code until counter is zero
lda >GeneralReg ; Get Zip GS status register
tax ; Save status register
eor #0xF8 ; Flip non-essential status bits
sta >GeneralReg ; Save flipped status register
cmp >GeneralReg ; Check to see if save worked
php ; Save the save worked flag
txa ; Un-flip non-essential status bits
sta >GeneralReg ; Restore old status register
plp ; Restore the save worked flag
bne ExitFindZip ; If no Zip found, do not set Zip speed
inc found ; Got a better idea?
ExitFindZip: LongM ; Make accumulator 16 bits wide
}
return found;
} /* FindZip() */
asm void NoZip(void)
{
ShortM ; Make accumulator 8 bits wide
lda #DisableZip ; Prepare to turn off the Zip
sta >LockReg ; Turn off the Zip
lda #LockZip ; Prepare to lock the Zip registers
sta >LockReg ; Lock the Zip registers
LongM ; Make accumulator 16 bits wide
rtl
} /* NoZip() */
void FastZip(byte speed)
{
asm {
ShortM ; Make accumulator 8 bits wide
lda >EnableReg ; Get the Zip enabled register
and #0xEF ; Clear the Zip disabled flag
sta >EnableReg ; Save the new Zip enabled register
lda speed ; Prepare to set appropriate speed
sta >SetSpeedReg ; Switch the Zip to appropriate speed
lda #LockZip ; Prepare to lock the Zip registers
sta >LockReg ; Lock the Zip registers
LongM ; Make accumulator 16 bits wide
}
} /* FastZip() */
void SetSpeed(byte whatSpeed)
{
byte accelerator = (FindZip() ? ZipGSX : (FindTWGS() ? TWGS : None));
byte zipSpeed = whatSpeed & 0xF0;
switch(whatSpeed & 0x0F) {
case Normal:
switch(accelerator) {
case TWGS:
SlowTWGS(); /* Switch the TWGS to slow speed */
break;
case ZipGSX:
NoZip(); /* Switch off the Zip GS */
break;
}
SlowGS(); /* Switch the IIGS to normal speed */
break;
case Fast:
switch(accelerator) {
case TWGS:
NoTWGS(); /* Switch off the TWGS */
break;
case ZipGSX:
NoZip(); /* Switch off the Zip GS */
break;
}
if (0) /* Jump to FastGS() call! */
case Maximum:
switch(accelerator) {
case TWGS:
FastTWGS(); /* Switch the TWGS to maximum speed */
break;
case ZipGSX:
#ifdef _DEBUG_
printf("0x%02X\n", zipSpeed);
#endif
FastZip(zipSpeed); /* Switch the Zip GS to appropriate speed */
break;
}
FastGS(); /* Switch the IIGS to fast speed */
break;
}
} /* SetSpeed() */
void main(int argc, char *argv[])
{
if (argc < 2 || argc > 3) {
printf("Usage : speed howFast [zipSpeed]"
"\nwhere howFast is a value in range 0..3"
"\n 0 - Current"
"\n 1 - Normal"
"\n 2 - Fast"
"\n 3 - Accelerate"
"\n zipSpeed is a value in range 0..F\n");
exit(-1);
}
switch(argv[1][0]) {
case '0' :
break;
case '1' :
case '2' :
case '3' :
SetSpeed(char2hex(argv[1][0]) | (char2hex(argv[2][0]) << 4));
break;
default :
printf("Please enter a value in range 0..3.\n");
break;
}
}
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That's all Folks :)