mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-22 16:34:15 +00:00
79 lines
2.8 KiB
Plaintext
79 lines
2.8 KiB
Plaintext
|
;Commander X16 ABI Registers Assembly Language Routines
|
||
|
|
|
||
|
|
;Zero Page System Variables - x16emu Release 34 Memory Map
|
||
|
|
ABIPTR EQU $00 ;Pointer for ABI Functions
|
||
|
|
R0 EQU $02 ;ABI Register 0
|
||
|
|
R0L EQU $02 ;ABI Register 0 LSB
|
||
|
|
R0H EQU $03 ;ABI Register 0 MSB
|
||
|
|
R1 EQU $04 ;ABI Register 1
|
||
|
|
R1L EQU $04 ;ABI Register 1 LSB
|
||
|
|
R1H EQU $05 ;ABI Register 1 MSB
|
||
|
|
R2 EQU $06 ;ABI Register 2
|
||
|
|
R2L EQU $06 ;ABI Register 2 LSB
|
||
|
|
R2H EQU $07 ;ABI Register 2 MSB
|
||
|
|
R3 EQU $08 ;ABI Register 3
|
||
|
|
R3L EQU $08 ;ABI Register 3 LSB
|
||
|
|
R3H EQU $09 ;ABI Register 3 MSB
|
||
|
|
R4 EQU $0A ;ABI Register 4
|
||
|
|
R4L EQU $0A ;ABI Register 4 LSB
|
||
|
|
R4H EQU $0B ;ABI Register 4 MSB
|
||
|
|
R5 EQU $0C ;ABI Register 5
|
||
|
|
R5L EQU $0C ;ABI Register 5 LSB
|
||
|
|
R5H EQU $0D ;ABI Register 5 MSB
|
||
|
|
R6 EQU $0E ;ABI Register 6
|
||
|
|
R6L EQU $0E ;ABI Register 6 LSB
|
||
|
|
R6H EQU $0F ;ABI Register 6 MSB
|
||
|
|
R7 EQU $10 ;ABI Register 7
|
||
|
|
R7L EQU $10 ;ABI Register 7 LSB
|
||
|
|
R7H EQU $11 ;ABI Register 7 MSB
|
||
|
|
R8 EQU $12 ;ABI Register 8
|
||
|
|
R8L EQU $12 ;ABI Register 8 LSB
|
||
|
|
R8H EQU $13 ;ABI Register 8 MSB
|
||
|
|
R9 EQU $14 ;ABI Register 9
|
||
|
|
R9L EQU $14 ;ABI Register 9 LSB
|
||
|
|
R9H EQU $15 ;ABI Register 9 MSB
|
||
|
|
R10 EQU $16 ;ABI Register 10
|
||
|
|
R10L EQU $16 ;ABI Register 10 LSB
|
||
|
|
R10H EQU $17 ;ABI Register 10 MSB
|
||
|
|
R11 EQU $18 ;ABI Register 11
|
||
|
|
R11L EQU $18 ;ABI Register 11 LSB
|
||
|
|
R11H EQU $19 ;ABI Register 11 MSB
|
||
|
|
R12 EQU $1A ;ABI Register 12
|
||
|
|
R12L EQU $1A ;ABI Register 12 LSB
|
||
|
|
R12H EQU $1B ;ABI Register 12 MSB
|
||
|
|
R13 EQU $1C ;ABI Register 13
|
||
|
|
R13L EQU $1C ;ABI Register 13 LSB
|
||
|
|
R13H EQU $1D ;ABI Register 13 MSB
|
||
|
|
R14 EQU $1E ;ABI Register 14
|
||
|
|
R14L EQU $1E ;ABI Register 14 LSB
|
||
|
|
R14H EQU $1F ;ABI Register 14 MSB
|
||
|
|
R15 EQU $20 ;ABI Register 15
|
||
|
|
R15L EQU $20 ;ABI Register 15 LSB
|
||
|
|
R15H EQU $21 ;ABI Register 15 MSB
|
||
|
|
|
||
|
|
;Read ABI Registers into Array or Struct
|
||
|
|
GETABI: STX ABIPTR ;Store Array Address
|
||
|
|
STY ABIPTR+1
|
||
|
|
TAY ;Copy Array Size into Y Register
|
||
|
|
GETABY: DEY ;Decrement Counter
|
||
|
|
BMI .GETABX ;If Not Negative
|
||
|
|
LDA R0,Y ;Get Byte from ABI Register
|
||
|
|
STA (ABIPTR),Y ;And write to ABI Register
|
||
|
|
BRA GETABY ;and Loop
|
||
|
|
.GETABX RTS
|
||
|
|
|
||
|
|
;Return ABI Register Contents
|
||
|
|
GETABR: TAX ;Copy Register
|
||
|
|
|
||
|
|
|
||
|
|
;Write Array or Struct to ABI Registers
|
||
|
|
SETABI: STX ABIPTR ;Store Array Address
|
||
|
|
STY ABIPTR+1
|
||
|
|
TAY ;Copy Array Size into Y Register
|
||
|
|
SETABY: DEY ;Decrement Counter
|
||
|
|
BMI .SETABX ;If Not Negative
|
||
|
|
LDA (ABIPTR),Y ;Get Byte from Array or Struct
|
||
|
|
STA R0,Y ;Store in ABI Register
|
||
|
|
BRA SETABY ;and Loop
|
||
|
|
.SETABX RTS
|