mirror of https://github.com/option8/sim8800.git
125 lines
3.4 KiB
ArmAsm
125 lines
3.4 KiB
ArmAsm
DSK LOADER
|
|
|
|
**************************************************
|
|
* boot stub at $2000 to BLOAD real program at $3000, JMP $3000
|
|
**************************************************
|
|
* Variables
|
|
**************************************************
|
|
|
|
|
|
**************************************************
|
|
* Apple Standard Memory Locations
|
|
**************************************************
|
|
CLRLORES EQU $F832
|
|
LORES EQU $C050
|
|
TXTSET EQU $C051
|
|
MIXCLR EQU $C052
|
|
MIXSET EQU $C053
|
|
TXTPAGE1 EQU $C054
|
|
TXTPAGE2 EQU $C055
|
|
KEY EQU $C000
|
|
C80STOREOF EQU $C000
|
|
C80STOREON EQU $C001
|
|
STROBE EQU $C010
|
|
SPEAKER EQU $C030
|
|
VBL EQU $C02E
|
|
RDVBLBAR EQU $C019 ;not VBL (VBL signal low
|
|
WAIT EQU $FCA8
|
|
RAMWRTAUX EQU $C005
|
|
RAMWRTMAIN EQU $C004
|
|
SETAN3 EQU $C05E ;Set annunciator-3 output to 0
|
|
SET80VID EQU $C00D ;enable 80-column display mode (WR-only)
|
|
CLR80VID EQU $C00C
|
|
HOME EQU $FC58 ; clear the text screen
|
|
CH EQU $24 ; cursor Horiz
|
|
CV EQU $25 ; cursor Vert
|
|
VTAB EQU $FC22 ; Sets the cursor vertical position (from CV)
|
|
COUT EQU $FDED ; Calls the output routine whose address is stored in CSW,
|
|
; normally COUTI
|
|
STROUT EQU $DB3A ;Y=String ptr high, A=String ptr low
|
|
|
|
ALTTEXT EQU $C055
|
|
ALTTEXTOFF EQU $C054
|
|
|
|
ROMINIT EQU $FB2F
|
|
ROMSETKBD EQU $FE89
|
|
ROMSETVID EQU $FE93
|
|
|
|
ALTCHAR EQU $C00F ; enables alternative character set - mousetext
|
|
|
|
BLINK EQU $F3
|
|
SPEED EQU $F1
|
|
|
|
BELL EQU $FF3A ; Monitor BELL routine
|
|
CROUT EQU $FD8E ; Monitor CROUT routine
|
|
PRBYTE EQU $FDDA ; Monitor PRBYTE routine
|
|
MLI EQU $BF00 ; ProDOS system call
|
|
OPENCMD EQU $C8 ; OPEN command index
|
|
READCMD EQU $CA ; READ command index
|
|
CLOSECMD EQU $CC ; CLOSE command index
|
|
|
|
|
|
**************************************************
|
|
* START - sets up various fiddly zero page bits
|
|
**************************************************
|
|
|
|
ORG $2000 ; PROGRAM DATA STARTS AT $2000
|
|
|
|
JSR BLOAD ; BLOAD SIM80
|
|
|
|
JMP $9000 ; jump to the new location
|
|
|
|
**************************************************
|
|
* Load "SIM80" into memory at $9000
|
|
**************************************************
|
|
|
|
ERROR JSR PRBYTE ;Print error code
|
|
JSR CROUT ;Print a carriage return
|
|
RTS
|
|
|
|
|
|
|
|
BLOAD JSR OPEN ;open "DATA"
|
|
JSR READ
|
|
JSR ERROR
|
|
JSR CLOSE
|
|
JSR ERROR
|
|
RTS ;Otherwise done
|
|
|
|
OPEN JSR MLI ;Perform call
|
|
DB OPENCMD ;CREATE command number
|
|
DW OPENLIST ;Pointer to parameter list
|
|
JSR ERROR ;If error, display it
|
|
LDA REFERENCE
|
|
STA READLIST+1
|
|
STA CLOSELIST+1
|
|
RTS
|
|
|
|
READ JSR MLI
|
|
DB READCMD
|
|
DW READLIST
|
|
RTS
|
|
|
|
CLOSE JSR MLI
|
|
DB CLOSECMD
|
|
DW CLOSELIST
|
|
RTS
|
|
|
|
OPENLIST DB $03 ; parameter list for OPEN command
|
|
DW FILENAME
|
|
DA MLI-$400 ; buffer snuggled up tight with PRODOS
|
|
REFERENCE DB $00 ; reference to opened file
|
|
|
|
READLIST DB $04
|
|
DB $00 ; REFERENCE written here after OPEN
|
|
DB $00,$90 ; write to $9000 - leaves 32K for Altair
|
|
DB $FF,$FF ; read as much as $FFFF - should error out with EOF before that.
|
|
TRANSFERRED DB $00,$00
|
|
|
|
CLOSELIST DB $01
|
|
DB $00
|
|
|
|
FILENAME DB ENDNAME-NAME ;Length of name
|
|
NAME ASC 'SIM8800' ;followed by the name
|
|
ENDNAME EQU *
|