142 lines
3.8 KiB
ArmAsm
142 lines
3.8 KiB
ArmAsm
DSK LOADER
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**************************************************
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* boot stub at $2000 to BLOAD real program at $0C00, JMP $0C00
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**************************************************
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* Variables
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**************************************************
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**************************************************
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* Apple Standard Memory Locations
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**************************************************
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CLRLORES EQU $F832
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LORES EQU $C050
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TXTSET EQU $C051
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MIXCLR EQU $C052
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MIXSET EQU $C053
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TXTPAGE1 EQU $C054
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TXTPAGE2 EQU $C055
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KEY EQU $C000
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C80STOREOF EQU $C000
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C80STOREON EQU $C001
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STROBE EQU $C010
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SPEAKER EQU $C030
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VBL EQU $C02E
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RDVBLBAR EQU $C019 ;not VBL (VBL signal low
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WAIT EQU $FCA8
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RAMWRTAUX EQU $C005
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RAMWRTMAIN EQU $C004
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SETAN3 EQU $C05E ;Set annunciator-3 output to 0
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SET80VID EQU $C00D ;enable 80-column display mode (WR-only)
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CLR80VID EQU $C00C
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HOME EQU $FC58 ; clear the text screen
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CH EQU $24 ; cursor Horiz
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CV EQU $25 ; cursor Vert
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VTAB EQU $FC22 ; Sets the cursor vertical position (from CV)
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COUT EQU $FDED ; Calls the output routine whose address is stored in CSW,
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; normally COUTI
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STROUT EQU $DB3A ;Y=String ptr high, A=String ptr low
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ALTTEXT EQU $C055
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ALTTEXTOFF EQU $C054
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ROMINIT EQU $FB2F
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ROMSETKBD EQU $FE89
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ROMSETVID EQU $FE93
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ALTCHAR EQU $C00F ; enables alternative character set - mousetext
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BLINK EQU $F3
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SPEED EQU $F1
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BELL EQU $FF3A ; Monitor BELL routine
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CROUT EQU $FD8E ; Monitor CROUT routine
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PRBYTE EQU $FDDA ; Monitor PRBYTE routine
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MLI EQU $BF00 ; ProDOS system call
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OPENCMD EQU $C8 ; OPEN command index
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READCMD EQU $CA ; READ command index
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CLOSECMD EQU $CC ; CLOSE command index
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**************************************************
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* START - sets up various fiddly zero page bits
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**************************************************
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ORG $2000 ; PROGRAM DATA STARTS AT $2000
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JSR BLOAD ; BLOAD DATA
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JMP $0800 ; jump to the new location
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**************************************************
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* Load "GREENSCALE" into memory at $0800
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**************************************************
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BLOAD JSR OPEN ;open "PRORWTS2"
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JSR READ
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JSR ERROR
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JSR CLOSE
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JSR ERROR
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JSR $800 ;init ProRWTS2
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LDA #>FILENAME2
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STA OPENLIST+2
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LDA #<FILENAME2
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STA OPENLIST+1
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JSR OPEN ;open "DATA"
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JSR READ
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JSR ERROR
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JSR CLOSE
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JSR ERROR
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RTS ;Otherwise done
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OPEN JSR MLI ;Perform call
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DB OPENCMD ;CREATE command number
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DW OPENLIST ;Pointer to parameter list
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JSR ERROR ;If error, display it
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LDA REFERENCE
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STA READLIST+1
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STA CLOSELIST+1
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RTS
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READ JSR MLI
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DB READCMD
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DW READLIST
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RTS
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CLOSE JSR MLI
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DB CLOSECMD
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DW CLOSELIST
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RTS
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ERROR JSR PRBYTE ;Print error code
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JSR BELL ;Ring the bell
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JSR CROUT ;Print a carriage return
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RTS
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OPENLIST DB $03 ; parameter list for OPEN command
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DW FILENAME1
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DA $6000 ; not near me
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REFERENCE DB $00 ; reference to opened file
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READLIST DB $04
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DB $00 ; REFERENCE written here after OPEN
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DB $00,$08 ; write to $0800
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DB $FF,$FF ; read as much as $FFFF - should error out with EOF before that.
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TRANSFERRED DB $00,$00
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CLOSELIST DB $01
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DB $00
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FILENAME1 DB ENDNAME1-NAME1 ;Length of name
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NAME1 ASC 'PRORWTS2T' ;followed by the name
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ENDNAME1 EQU *
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FILENAME2 DB ENDNAME2-NAME2 ;Length of name
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NAME2 ASC 'BADAPPLET' ;followed by the name
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ENDNAME2 EQU *
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