mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-29 01:49:19 +00:00
97 lines
3.2 KiB
Plaintext
97 lines
3.2 KiB
Plaintext
; c02 Program Initialization Code for Commander X16
|
|
; Compatible with x16emu Release 34
|
|
|
|
;PETSCII Key Mappings
|
|
DELKEY EQU $14 ;Delete/Backspace Key (Delete)
|
|
ESCKEY EQU $03 ;Escape/Stop Key (RUN/STOP)
|
|
RTNKEY EQU $0D ;Return/Enter Key (RETURN)
|
|
|
|
;Zero Page System Variables - x16emu Release 34 Memory Map
|
|
;UNUSED $00-$01 ;Available to User
|
|
; $02-$52 ;Used by Basic graphics commands
|
|
XMBANK EQU $53 ;Extended Memory Bank
|
|
XADRLO EQU $54 ;Ext Memory Address LSB
|
|
XADRHI EQU $55 ;Ext Memory Address MSB
|
|
SRCPTR EQU $56 ;Source Pointer
|
|
SRCLO EQU $57 ;Source Pointer LSB
|
|
SRCHI EQU $58 ;Source Pointer MSB
|
|
DSTPTR EQU $59 ;Destination Pointer
|
|
DSTLO EQU $5A ;Destination Pointer LSB
|
|
DSTHI EQU $5B ;Destination Pointer MSB
|
|
BLKLO EQU $5C ;Block Pointer LSB
|
|
BLKHI EQU $5D ;Block Pointer MSB
|
|
STKLO EQU $5E ;Stack Pointer LSB
|
|
STKHI EQU $5F ;Stack Pointer MSB
|
|
BFRLO EQU $60 ;Buffer Pointer LSB
|
|
BFRHI EQU $61 ;Buffer Pointer MSB
|
|
RANDOM EQU $62 ;Random Number Storage
|
|
RDSEED EQU $63 ;Random Seed
|
|
TEMP0 EQU $64 ;Temporary Variable
|
|
TEMP1 EQU $65 ;Temporary Variable
|
|
TEMP2 EQU $66 ;Temporary Variable
|
|
TEMP3 EQU $67 ;Temporary Variable
|
|
; $68-7F ;Available to User
|
|
; $80-$83 ;Used by Kernal and DOS
|
|
; $A4-$A8 ;Reserved for KERNAL/DOS/BASIC
|
|
; $A9-$FF ;Used by BASIC
|
|
|
|
;Other Variables - Top of Extended System RAM Area
|
|
BLKSLO EQU $07F4 ;Block Start LSB
|
|
BLKSHI EQU $07F5 ;Block Start MSB
|
|
BLKELO EQU $07F6 ;Block End LSB
|
|
BLKEHI EQU $07F7 ;Block End MSB
|
|
BLKLEN EQU $07F8 ;Block Length
|
|
|
|
STKSAV EQU $07FA ;Machine Stack Storage
|
|
|
|
STKSLO EQU $07FC ;Stack Start LSB
|
|
STKSHI EQU $07FD ;Stack Start MSB
|
|
STKELO EQU $07FE ;Stack End LSB
|
|
STKEHI EQU $07FF ;Stack End MSB
|
|
|
|
;Machine Language Basic Stub - Same as Commodore 64
|
|
ORG $0801 ;Start of Basic Program
|
|
BASIC: DC $0C, $08 ;Pointer to Next Line
|
|
DC $00, $00 ;Line Number (0)
|
|
DC $9E ;SYS
|
|
DC $20 ;' '
|
|
DC $32, $30, $36 ,$32 ;"2062"
|
|
DC $00 ;End of Line Marker
|
|
DC $00, $00 ;End of Basic Program
|
|
|
|
START: TSX ;Get Stack Pointer
|
|
STX STKSAV ;and Save for Exit
|
|
SEC ;Set Screen Mode
|
|
LDA #0 ;to 40x30 Text
|
|
JSR $FF5F ;using SCRMOD
|
|
JMP MAIN ;Execute Program
|
|
|
|
EXIT: LDX STKSAV ;Retrieve Saved Stack Pointer
|
|
TXS ;and Restore It
|
|
RTS ;Return to BASIC
|
|
|
|
;Poll Keyboard for Character
|
|
POLKEY EQU $FFE4 ;Aliased to Kernal GETIN Routine
|
|
|
|
;Get Character from Keyboard
|
|
GETKEY EQU POLKEY ;Aliased to POLKEY Routine
|
|
|
|
;Wait for Character from Keyboard
|
|
GETCHR: JSR GETKEY ;Poll Keyboard
|
|
BEQ GETCHR ;If No Key, Loop
|
|
RTS
|
|
|
|
;Print Character to Console
|
|
PUTCHR EQU $FFD2 ;Aliased to CHROUT Routine
|
|
|
|
;Delete Previous Character
|
|
DELCHR: LDA #DELKEY ;Load Delete Character
|
|
JMP PUTCHR ;Print and Return
|
|
|
|
;Advance Character to Next line
|
|
NEWLIN: LDA #RTNKEY ;Load Return Character
|
|
JMP PUTCHR ;Print and Return
|
|
|
|
INCLUDE "../include/prbyte.a02" ;PRBYTE and PRHEX routine
|
|
INCLUDE "../include/putstr.a02" ;PUTSTR routine
|