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182 lines
3.4 KiB
ArmAsm
182 lines
3.4 KiB
ArmAsm
*
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* Apple IIgs accelerators
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* Set 2.8MHz & Restore speed
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*
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* (c) 2024, Brutal Deluxe Software
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*
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org $1000
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mx %00
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lst off
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*----------------------------------------
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* Accelerators
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* Applesqueezer
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* Transwarp GS
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* ZipGSX (+ KEGS, Sweet16)
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*
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* In full 16-bits
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* set28SPEED
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* identifies the accelerator
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* set the closest speed to 2.8MHz
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*
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* restoreSPEED
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* set the previous or highest speed
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*----------------------------------------
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*----------------------------------------
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* EQUATES
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*----------------------------------------
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*-------------- Applesqueezer
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* Niek says: "These 5 settings correspond to the 5 speed options in
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* the AppleSqueezer control panel.
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* 255 is the fastest setting corresponding to 14MHz. and
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* 223 is the slowest setting, corresponding to 3MHz
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* Possible values are 255, 251, 247, 239, and 223.
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FL_IDLE = $e2000a
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FL_VERSION = $e2000c
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SET_SPEED = $e50000
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*-------------- Transwarp GS
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* Possible values: 1000 (1MHz), 2600 (2.6MHz), 7000 (7MHz)
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GetCurSpeed = $bcff20 ; value returned in A
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SetCurSpeed = $bcff24 ; value passed in A
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* or, if your prefer indexes: 0 (1MHz), 1 (2.6MHz), 2 (7MHz)
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GetICurSpeed = $bcff28 ; value returned in X
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SetICurSpeed = $bcff2c ; value passed in X
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*-------------- ZipGS
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* Sixteen possible speeds (in % of full speed)
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* 0: full speed, 4: 75% of full speed, 8: 50%, 12: 25%, 16: 1MHz (disabled)
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* Set the value in bits 4-7 of CLRAN2
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SETAN0 = $e0c058
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CLRAN0 = $e0c059
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SETAN1 = $e0c05a
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CLRAN1 = $e0c05b
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SETAN2 = $e0c05c
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CLRAN2 = $e0c05d
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SETAN3 = $e0c05e
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CLRAN3 = $e0c05f
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*----------------------------------------
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* SAVE SPEED & SET 2.8MHz
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*----------------------------------------
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* Entry in full 16-bits
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set28SPEED sep #$20 ; Check Applesqueezer
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ldal FL_IDLE ; do we have an AS?
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and #$ff
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cmp #1
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bne no_AS ; no AS present
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* ldal SET_SPEED ; get current speed
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* sta accSPEED ; save it
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lda #233 ; set 3.10MHz
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stal SET_SPEED ; the closest match
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rep #$20
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lda #1 ; tell we have an AS acc
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sta theACC
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rts
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mx %10
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no_AS rep #$20 ; Check Transwarp IIgs
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ldal $bcff00 ; do we have a TWGS?
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cmp #'TW'
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bne no_TW
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ldal $bcff02
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cmp #'GS'
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bne no_TW ; no TWGS present
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jsl GetCurSpeed ; get current speed
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sta accSPEED ; save it
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lda #2600 ; set 2.6MHz
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jsr SetCurSpeed ; the closest match
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lda #2
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sta theACC ; tell we have a TWGS
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rts
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no_TW sep #$20 ; Check ZipGSX
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lda #$5a ; unlock
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stal SETAN1
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stal SETAN1
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stal SETAN1
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stal SETAN1
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ldal CLRAN0 ; do we have a ZipGS?
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eor #$f8
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sta temp
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stal CLRAN0
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ldal CLRAN0
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cmp temp
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bne no_ACC ; no ZipGS present
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eor #$f8
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stal CLRAN0
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lda #%1010_0000 ; #$10-#$6th option (3.10MHz) or #%1011_0000 for 2.56MHz
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stal CLRAN2 ; set speed
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stal CLRAN1 ; enable card
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lda #$a5 ; lock
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stal SETAN1
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lda #3
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sta theACC ; tell we have a ZipGS
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no_ACC rep #$20
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rts
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*----------------------------------------
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* RESTORE ORIGINAL SPEED
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*----------------------------------------
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* Entry in full 16-bits
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restoreSPEED lda theACC ; Applesqueezer?
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cmp #1
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bne check_TW
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sep #$20
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lda accSPEED
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stal SET_SPEED
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rep #$20
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rts
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check_TW cmp #2 ; Transwarp GS?
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bne check_ZIP
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lda accSPEED ; restore speed
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jsl SetCurSpeed
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rts
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check_ZIP cmp #3 ; ZipGSX?
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bne check_NADA
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sep #$20 ; restore speed
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lda #$5a ; unlock
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stal SETAN1
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stal SETAN1
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stal SETAN1
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stal SETAN1
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lda #%0000_0000 ; any write to set fastest speed
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stal CLRAN2
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stal CLRAN1
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lda #$a5 ; lock
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stal SETAN1
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rep #$20
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check_NADA rts
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*-------------- Data
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theACC ds 2 ; 1:AS / 2:TW / 3:ZIP
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accSPEED ds 2
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*-------------- End of code |