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sim8800
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fixed /SIM8800/ prefix issue

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Charles Mangin 2019-10-10 21:20:30 -04:00 committed by GitHub
parent 0313d8ad6b
commit eadf768bdb
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2 changed files with 234 additions and 99 deletions
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124
LOADER.s Normal file
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@ -0,0 +1,124 @@
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 *

209
SIM8800.s
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@ -7,9 +7,13 @@
ORG $9000
; ----------------------------------------------------------------------------
; TODO:
; TODO: real access display while in trace/step
; set displaybytes/+1 on memory access.
;
; port to 65816 - 24bit addresses, 16 bit registers, 64k contiguous AUX, 2.8mhz
;
;
;
; ----------------------------------------------------------------------------
ZERO EQU $00
@ -49,6 +53,7 @@ KSWL EQU $38 ; keyboard input routine
KSWH EQU $39 ; normally $FD1B
HIPCH EQU $FE ; is the PC above 32k limit?
HIPCOFFSET EQU $FD ; 80 or 70. SPAGHETTI!
KBDBUF EQU $C000 ; KEYBOARD BUFFER
KBDSTROBE EQU $C010 ; KEYBOARD STROBE
@ -188,6 +193,10 @@ SBC10 STA PCH ; store resulting PCH
MAIN SEI ; DON'T ALLOW INTERRUPTS
CLD ; CLEAR DECIMAL MODE
LDX #$00 ; LOAD INDEX
LDA #$80
STA HIPCOFFSET ; set offset
; **** add $10 to SIMH
CLC
LDA SIMH
@ -197,8 +206,7 @@ MAIN SEI ; DON'T ALLOW INTERRUPTS
CMP #$7F ; if it's >=32K boundary after add $10, get from AUX
BCC STASIMM2
STA RAMRDON ; set AUX READ
SBC #$80 ; subtract #$80
SBC HIPCOFFSET ; subtract #$80
CLC ; read from AUX, still write to MAIN
; add #$80
; set MAIN READ
@ -222,8 +230,7 @@ DECSIMH SEC ; then subtract #$10... oof.
STA RAMRDOFF ; high = turn it off, etc
CLC ; add #$80 to SIMH again
LDA SIMH
ADC #$80
ADC HIPCOFFSET
STA SIMH
CHECKPCH ; is PC looking above #$8FFF?
@ -424,7 +431,8 @@ PUSHT TXA ; TEMP SAVE - x=0A on set return, gets PCL/H
PLA ; RECOVER TEMP SAVE
TAX ;
LDY #$80
STY HIPCOFFSET ; offset 80 for PUSH???
RPMEM LDY #$01 ; CLEAR INDEX
@ -434,9 +442,8 @@ RPMEM LDY #$01 ; CLEAR INDEX
LDA DESTDA,Y ; $04 + $12 = $16 DESTDA
STA DISPLAYBYTES ; high byte to first bank of LEDs.
CMP #$7F ; over 9000?
BCC RPMEM2 ; nope, skip math
SBC #$80 ; off by $10 ??? ***
BCC RPMEM2 ; nope, skip math
SBC HIPCOFFSET ; off by $10 ??? ***
STA RAMWRTON ; write to AUX
STA DESTDA,Y
@ -471,8 +478,7 @@ RPLP LDA SIMM,X ;GET NEXT RP DATA
BCS STADESTDA2 ; Over 1000, skip
STADESTDA3 SEC
SBC #$80
SBC HIPCOFFSET
STA RAMWRTON
STA DESTDA+1
@ -483,8 +489,7 @@ STADESTDA2 PLA ; get RP data back
BPL RPLP2
CLC
LDA DESTDA+1
ADC #$80
ADC HIPCOFFSET
STA DESTDA+1
STA RAMWRTOFF ; write to MAIN
@ -592,7 +597,8 @@ RETUN
; **** doing a JUMP or CALL - reset HIPCH
LDA #$00
STA HIPCH
LDA #$80
STA HIPCOFFSET ; set offset
; **** doing a JUMP or CALL - reset HIPCH
LDA SPH
@ -603,8 +609,7 @@ RETUN
CMP #$10
BCS RETUN2
SEC
RETUN1
SBC #$80 ; *** SPH off by $10?
RETUN1 SBC HIPCOFFSET ; *** SPH off by $10?
STA RAMRDON
STA RAMWRTON
STA SPH
@ -623,10 +628,12 @@ RETUN2 CLC
BPL RETUN3
LDA SPH ; return SPH to high value
CLC
ADC #$80 ; *** SPH off by $10?
ADC HIPCOFFSET ; *** SPH off by $10?
STA SPH
STA RAMRDOFF
STA RAMWRTOFF
LDA #$80
STA HIPCOFFSET ; set offset
RETUN3 LDX #$0A ; POP RETURN OFF
BNE POPIT ; STACK INTO PC
@ -650,6 +657,11 @@ POP LSR A ; POP?
POPIT TXA ; TEMP SAVE INDEX
PHA ;
;***
; POP and RETURN get stack offset 70.
LDA #$70
STA HIPCOFFSET ; set offset
;***
JSR SPPNT ; PULL OUT STACK DATA
PLA ; BUMP SP
@ -1002,98 +1014,93 @@ STPSW STA PSW ; SAVE NEW PSW
; ----------------------------------------------------------------------------
ROTATE LDY SIMA ; GET ACCUMULATOR
LSR A ; IS THIS CMC OR 8TC?
BNE ROCOMP ; NO, IT IS A ROTATE .OR CMA
LDA PSW ; YES, CHANGE CARRY
EOR #$01 ; CMC
ROTATE LDY SIMA ;
LSR A ;
BNE ROCOMP ;
LDA PSW ;
EOR #$01 ;
BCC STPS ;
ORA #$01 ; STC
ORA #$01 ;
STPS BVS STPSW ;
; ----------------------------------------------------------------------------
ROCOMP BCS LEFT ; LEFT OR RIGHT?
LSR A ; CMA?
BNE ROT ; NO, ROTATE
TYA ; YES, COMMPLEMFNT A
EOR #$FF ;
STA SIMA ; DOESN* T SET STATUS
ROCOMP BCS LEFT ;
LSR A ;
BNE ROT ;
TYA ;
EOR #$FF ;
STA SIMA ;
RTS ;
; ----------------------------------------------------------------------------
ROT TYA ; GET ACCUMULATOR
ROT TYA ;
BCS RRC ;
LDA PSW ; GET 8080 CARRY
LDA PSW ;
RRC LSR A ;
TYA ; GET ACCUMULATOR
ROR A ; ROTATE RIGHT
BVS JCRY ; GO STORE&SET CARRY
; ----------------------------------------------------------------------------
LEFT LSR A ; DECIMAL ADJUST? IYES# GO 00 IT
BEQ DAA ; N 0 , GET ACCUMULATOR
TYA ; JRLC?
BCS RLC ; NO#GET 8080 CARRY
LDA PSW ; MOVE IT INTO MSNIB
ROR A ;
ROR A ;
RLC ASL A ; MOVE IT INTO CARRY
TYA ; G E T ACCUMULATOR
ROL A ; MOVE IT LEFT
JCRY STA SIMA ; SAVE IT
JMP CARRY ; GO SET STATUS
TYA ;
ROR A ;
BVS JCRY ;
LEFT LSR A ;
BEQ DAA ;
TYA ;
BCS RLC ;
LDA PSW ;
ROR A ;
ROR A ;
RLC ASL A ;
TYA ;
ROL A ;
JCRY STA SIMA ;
JMP CARRY ;
; ----------------------------------------------------------------------------
DAA CLC ;
PHP ;PRE3ERVE STATUS |
TYA ;GET SOURCE DATA
STA ZERO ; PREP FOR ADD
AND #$0F ;LOOK AT LSNI8
ADC #$06 ;IF *0A WILL CAUSE AUX CRY
ORA PSW ;OR I F AC I S ALREADY SET
AND #$10 ; EITHER SET?
BEQ NOSIX ;NO, DON T ADJUST LSNIB
LDA #$06 ; YES# ADJUST IT
NOSIX TAY ;
ADC ZERO ; G E T SOURCE
PHP ;
TYA ;
STA ZERO ;
AND #$0F ;
ADC #$06 ;
ORA PSW ;
AND #$10 ;
BEQ NOSIX ;
LDA #$06 ;
NOSIX TAY ;
ADC ZERO ;
BCS SXTY ;
ADC #$60 ;113 MSNIB NOW > A0T IIF SO* CARRY IS SET
ROL A ;G E T CARRY
ORA PSW ;OR WITH 8080 CARRY
LSR A ;I S EITHER SETT
BCC DA ;NO# DON'T ADJUST MSNIB l
SXTY TYA ;YES* ADJUST MSN!B I
ADC #$5F ;(5F + CARRY = 60)
ADC #$60 ;
ROL A ;
ORA PSW ;
LSR A ;
BCC DA ;
SXTY TYA ;
ADC #$5F ;
TAY ;
DA LDX #$00 ;DESTINATION IS A
PLP ;RESTQRE STATUS
DA LDX #$00 ;
PLP ;
ADCRY JSR ADDR ;
JSR CARRY ;
STATUS2
TAY ; SAVE RESULT
ROL PSW ; CLEAR P3W SIGN BIT
ASL A ; PUT NEW SIGN IN CARRY
STA FLAG ; C L E A R L S B OF F L A G
LDA PSW ; PUT NEW SIGN IN P3N
ROR A ;
SGN ORA #$46 ; PRESET Z*P 8 PRESET
TAX ; 3AVE IN X
TYA ; RECOVER WORD
BEQ DONE ; I F ZERO*ALL DONE
FLIP INC FLAG ; IFLIP FLAG |
PAR LSR A ; TEST EACH BIT I
BEQ ALL2 ; NO MORE BITS
TAY ;
ROL PSW ;
ASL A ;
STA FLAG ;
LDA PSW ;
ROR A ;
SGN ORA #$46 ;
TAX ;
TYA ;
BEQ DONE ;
FLIP INC FLAG ;
PAR LSR A ;
BEQ ALL2 ;
BCC PAR ;
ALL2 BCS FLIP ;
LSR FLAG ; TEST FLAG
TXA ; RECOVER P3w
AND #$BF ; CLEAR Z
BCS REC ; PARITY EVENT
AND #$FB ; N0* CLEAR P
REC TAX ; BACK TO X
DONE STX PSW ; STORE AS PSW
RTS ;
LSR FLAG ;
TXA ;
AND #$BF ;
BCS REC ;
AND #$FB ;
REC TAX ;
DONE STX PSW ;
RTS ;
; ----------------------------------------------------------------------------
@ -1165,6 +1172,8 @@ DEC LDY #$0C ; point to DEC data
; ----------------------------------------------------------------------------
MEMRP TYA ; grab source pointer offset
LDY #$80
STY HIPCOFFSET
LDA DESTDA+1
@ -1176,7 +1185,7 @@ MEMRP TYA ; grab source pointer offset
BCS MRLP1
AUXMEMRP STA RAMRDON ; read from AUX
SEC
SBC #$80
SBC HIPCOFFSET
STA DESTDA+1
MRLP1 LDY #$01 ; move data in memory
@ -1192,9 +1201,11 @@ MRLP LDA (DESTDA),Y ; get next byte
STA RAMRDOFF ; read from MAIN
LDA DESTDA+1
CLC
ADC #$80
ADC HIPCOFFSET
STA DESTDA+1
LDA #$80
STA HIPCOFFSET ; set offset
MRLPRTS RTS ;
@ -2649,11 +2660,11 @@ CHOOSER2 ASC " 1 FOR KILL-THE-BIT",00
CHOOSER3 ASC " 2 FOR 4K BASIC",00
CHOOSER4 ASC " 3 FOR 8K BASIC",00
CHOOSER5 ASC " 4 FOR MICROCHESS",00
CHOOSER6 ASC " 5 FOR DBL ROM AT $00",00
CHOOSER6 ASC " 5 FOR DISK BOOTLOADER",00
CHOOSER7 ASC " 0 FOR NO PROGRAM",00
CHOOSERTBL DB >CHOOSER1,<CHOOSER1,>CHOOSER2,<CHOOSER2,>CHOOSER3,<CHOOSER3
DB >CHOOSER4,<CHOOSER4,>CHOOSER5,<CHOOSER5,>CHOOSER6,<CHOOSER6
DB >CHOOSER4,<CHOOSER4,>CHOOSER5,<CHOOSER5,>CHOOSER6,<CHOOSER6,>CHOOSER7,<CHOOSER7
@ -2665,7 +2676,7 @@ CHOOSERLOOP LDY CHOOSERTBL,X
JSR STROUT ;Y=String ptr high, A=String ptr low
JSR CROUT
INX
CPX #$0C
CPX #$0E
BNE CHOOSERLOOP
CHOOSERWAITLOOP LDX #$00
@ -3004,7 +3015,7 @@ DSKREADLOC DB <BASICBUFFER,>BASICBUFFER ; write to end of sim8800
DSKTRANSFERRED DB $00,$00
DSKFILE DB ENDDSKNAME-DSKNAME ;Length of name
DSKNAME ASC '/SIM8800/ZORK.DSK' ;followed by the name
DSKNAME ASC '/SIM8800/VIRTUAL.DSK' ;followed by the name
ENDDSKNAME EQU *
WRITEDSK JSR MLI