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https://github.com/option8/sim8800.git
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Begin optimizing for 65C02, enhanced IIe
This commit is contained in:
Charles Mangin
GitHub
parent
2485c65486
commit
8b6fd7f1d9
212
SIM8800.s
212
SIM8800.s
@ -7,12 +7,9 @@
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ORG $9000
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; ----------------------------------------------------------------------------
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; TODO: real access display while in trace/step
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; set displaybytes/+1 on memory access.
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;
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; port to 65816 - 24bit addresses, 16 bit registers, 64k contiguous AUX, 2.8mhz
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;
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;
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; TODO:
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; optimize for speed, 65C02 - target is Enhanced IIe, 128K RAM
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; port to 65816? 24bit addresses, 16 bit registers, 64k contiguous AUX, 2.8mhz
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;
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; ----------------------------------------------------------------------------
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@ -53,7 +50,6 @@ KSWL EQU $38 ; keyboard input routine
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KSWH EQU $39 ; normally $FD1B
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HIPCH EQU $FE ; is the PC above 32k limit?
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HIPCOFFSET EQU $FD ; 80 or 70. SPAGHETTI!
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KBDBUF EQU $C000 ; KEYBOARD BUFFER
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KBDSTROBE EQU $C010 ; KEYBOARD STROBE
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@ -193,10 +189,6 @@ SBC10 STA PCH ; store resulting PCH
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MAIN SEI ; DON'T ALLOW INTERRUPTS
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CLD ; CLEAR DECIMAL MODE
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LDX #$00 ; LOAD INDEX
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LDA #$80
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STA HIPCOFFSET ; set offset
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; **** add $10 to SIMH
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CLC
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LDA SIMH
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@ -206,7 +198,8 @@ MAIN SEI ; DON'T ALLOW INTERRUPTS
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CMP #$7F ; if it's >=32K boundary after add $10, get from AUX
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BCC STASIMM2
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STA RAMRDON ; set AUX READ
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SBC HIPCOFFSET ; subtract #$80
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SBC #$80 ; subtract #$80
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CLC ; read from AUX, still write to MAIN
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; add #$80
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; set MAIN READ
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@ -230,7 +223,8 @@ DECSIMH SEC ; then subtract #$10... oof.
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STA RAMRDOFF ; high = turn it off, etc
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CLC ; add #$80 to SIMH again
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LDA SIMH
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ADC HIPCOFFSET
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ADC #$80
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STA SIMH
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CHECKPCH ; is PC looking above #$8FFF?
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@ -431,8 +425,7 @@ PUSHT TXA ; TEMP SAVE - x=0A on set return, gets PCL/H
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PLA ; RECOVER TEMP SAVE
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TAX ;
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LDY #$80
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STY HIPCOFFSET ; offset 80 for PUSH???
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RPMEM LDY #$01 ; CLEAR INDEX
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@ -442,8 +435,9 @@ RPMEM LDY #$01 ; CLEAR INDEX
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LDA DESTDA,Y ; $04 + $12 = $16 DESTDA
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STA DISPLAYBYTES ; high byte to first bank of LEDs.
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CMP #$7F ; over 9000?
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BCC RPMEM2 ; nope, skip math
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SBC HIPCOFFSET ; off by $10 ??? ***
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BCC RPMEM2 ; nope, skip math
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SBC #$80 ; off by $10 ??? ***
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STA RAMWRTON ; write to AUX
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STA DESTDA,Y
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@ -478,7 +472,8 @@ RPLP LDA SIMM,X ;GET NEXT RP DATA
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BCS STADESTDA2 ; Over 1000, skip
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STADESTDA3 SEC
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SBC HIPCOFFSET
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SBC #$80
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STA RAMWRTON
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STA DESTDA+1
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@ -489,7 +484,8 @@ STADESTDA2 PLA ; get RP data back
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BPL RPLP2
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CLC
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LDA DESTDA+1
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ADC HIPCOFFSET
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ADC #$80
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STA DESTDA+1
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STA RAMWRTOFF ; write to MAIN
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@ -597,8 +593,7 @@ RETUN
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; **** doing a JUMP or CALL - reset HIPCH
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LDA #$00
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STA HIPCH
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LDA #$80
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STA HIPCOFFSET ; set offset
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; **** doing a JUMP or CALL - reset HIPCH
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LDA SPH
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@ -609,7 +604,8 @@ RETUN
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CMP #$10
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BCS RETUN2
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SEC
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RETUN1 SBC HIPCOFFSET ; *** SPH off by $10?
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RETUN1
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SBC #$80 ; *** SPH off by $10?
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STA RAMRDON
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STA RAMWRTON
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STA SPH
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@ -628,12 +624,10 @@ RETUN2 CLC
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BPL RETUN3
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LDA SPH ; return SPH to high value
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CLC
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ADC HIPCOFFSET ; *** SPH off by $10?
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ADC #$80 ; *** SPH off by $10?
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STA SPH
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STA RAMRDOFF
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STA RAMWRTOFF
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LDA #$80
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STA HIPCOFFSET ; set offset
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RETUN3 LDX #$0A ; POP RETURN OFF
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BNE POPIT ; STACK INTO PC
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@ -657,11 +651,6 @@ POP LSR A ; POP?
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POPIT TXA ; TEMP SAVE INDEX
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PHA ;
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;***
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; POP and RETURN get stack offset 70.
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LDA #$70
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STA HIPCOFFSET ; set offset
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;***
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JSR SPPNT ; PULL OUT STACK DATA
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PLA ; BUMP SP
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@ -1014,93 +1003,98 @@ STPSW STA PSW ; SAVE NEW PSW
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; ----------------------------------------------------------------------------
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ROTATE LDY SIMA ;
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LSR A ;
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BNE ROCOMP ;
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LDA PSW ;
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EOR #$01 ;
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ROTATE LDY SIMA ; GET ACCUMULATOR
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LSR A ; IS THIS CMC OR 8TC?
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BNE ROCOMP ; NO, IT IS A ROTATE .OR CMA
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LDA PSW ; YES, CHANGE CARRY
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EOR #$01 ; CMC
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BCC STPS ;
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ORA #$01 ;
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ORA #$01 ; STC
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STPS BVS STPSW ;
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ROCOMP BCS LEFT ;
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LSR A ;
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BNE ROT ;
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TYA ;
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EOR #$FF ;
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STA SIMA ;
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; ----------------------------------------------------------------------------
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ROCOMP BCS LEFT ; LEFT OR RIGHT?
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LSR A ; CMA?
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BNE ROT ; NO, ROTATE
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TYA ; YES, COMMPLEMFNT A
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EOR #$FF ;
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STA SIMA ; DOESN* T SET STATUS
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RTS ;
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; ----------------------------------------------------------------------------
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ROT TYA ;
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ROT TYA ; GET ACCUMULATOR
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BCS RRC ;
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LDA PSW ;
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LDA PSW ; GET 8080 CARRY
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RRC LSR A ;
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TYA ;
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ROR A ;
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BVS JCRY ;
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LEFT LSR A ;
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BEQ DAA ;
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TYA ;
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BCS RLC ;
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LDA PSW ;
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ROR A ;
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ROR A ;
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RLC ASL A ;
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TYA ;
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ROL A ;
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JCRY STA SIMA ;
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JMP CARRY ;
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TYA ; GET ACCUMULATOR
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ROR A ; ROTATE RIGHT
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BVS JCRY ; GO STORE&SET CARRY
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; ----------------------------------------------------------------------------
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LEFT LSR A ; DECIMAL ADJUST? IYES# GO 00 IT
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BEQ DAA ; N 0 , GET ACCUMULATOR
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TYA ; JRLC?
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BCS RLC ; NO#GET 8080 CARRY
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LDA PSW ; MOVE IT INTO MSNIB
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ROR A ;
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ROR A ;
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RLC ASL A ; MOVE IT INTO CARRY
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TYA ; G E T ACCUMULATOR
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ROL A ; MOVE IT LEFT
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JCRY STA SIMA ; SAVE IT
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JMP CARRY ; GO SET STATUS
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; ----------------------------------------------------------------------------
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DAA CLC ;
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PHP ;
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TYA ;
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STA ZERO ;
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AND #$0F ;
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ADC #$06 ;
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ORA PSW ;
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AND #$10 ;
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BEQ NOSIX ;
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LDA #$06 ;
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NOSIX TAY ;
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ADC ZERO ;
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PHP ;PRE3ERVE STATUS |
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TYA ;GET SOURCE DATA
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STA ZERO ; PREP FOR ADD
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AND #$0F ;LOOK AT LSNI8
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ADC #$06 ;IF *0A WILL CAUSE AUX CRY
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ORA PSW ;OR I F AC I S ALREADY SET
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AND #$10 ; EITHER SET?
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BEQ NOSIX ;NO, DON T ADJUST LSNIB
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LDA #$06 ; YES# ADJUST IT
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NOSIX TAY ;
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ADC ZERO ; G E T SOURCE
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BCS SXTY ;
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ADC #$60 ;
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ROL A ;
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ORA PSW ;
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LSR A ;
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BCC DA ;
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SXTY TYA ;
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ADC #$5F ;
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ADC #$60 ;113 MSNIB NOW > A0T IIF SO* CARRY IS SET
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ROL A ;G E T CARRY
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ORA PSW ;OR WITH 8080 CARRY
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LSR A ;I S EITHER SETT
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BCC DA ;NO# DON'T ADJUST MSNIB l
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SXTY TYA ;YES* ADJUST MSN!B I
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ADC #$5F ;(5F + CARRY = 60)
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TAY ;
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DA LDX #$00 ;
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PLP ;
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DA LDX #$00 ;DESTINATION IS A
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PLP ;RESTQRE STATUS
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ADCRY JSR ADDR ;
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JSR CARRY ;
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STATUS2
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TAY ;
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ROL PSW ;
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ASL A ;
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STA FLAG ;
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LDA PSW ;
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ROR A ;
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SGN ORA #$46 ;
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TAX ;
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TYA ;
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BEQ DONE ;
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FLIP INC FLAG ;
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PAR LSR A ;
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BEQ ALL2 ;
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TAY ; SAVE RESULT
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ROL PSW ; CLEAR P3W SIGN BIT
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ASL A ; PUT NEW SIGN IN CARRY
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STA FLAG ; C L E A R L S B OF F L A G
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LDA PSW ; PUT NEW SIGN IN P3N
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ROR A ;
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SGN ORA #$46 ; PRESET Z*P 8 PRESET
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TAX ; 3AVE IN X
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TYA ; RECOVER WORD
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BEQ DONE ; I F ZERO*ALL DONE
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FLIP INC FLAG ; IFLIP FLAG |
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PAR LSR A ; TEST EACH BIT I
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BEQ ALL2 ; NO MORE BITS
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BCC PAR ;
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ALL2 BCS FLIP ;
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LSR FLAG ;
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TXA ;
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AND #$BF ;
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BCS REC ;
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AND #$FB ;
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REC TAX ;
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DONE STX PSW ;
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RTS ;
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LSR FLAG ; TEST FLAG
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TXA ; RECOVER P3w
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AND #$BF ; CLEAR Z
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BCS REC ; PARITY EVENT
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AND #$FB ; N0* CLEAR P
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REC TAX ; BACK TO X
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DONE STX PSW ; STORE AS PSW
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RTS ;
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; ----------------------------------------------------------------------------
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@ -1172,8 +1166,6 @@ DEC LDY #$0C ; point to DEC data
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; ----------------------------------------------------------------------------
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MEMRP TYA ; grab source pointer offset
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LDY #$80
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STY HIPCOFFSET
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LDA DESTDA+1
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@ -1185,7 +1177,7 @@ MEMRP TYA ; grab source pointer offset
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BCS MRLP1
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AUXMEMRP STA RAMRDON ; read from AUX
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SEC
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SBC HIPCOFFSET
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SBC #$80
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STA DESTDA+1
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MRLP1 LDY #$01 ; move data in memory
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@ -1201,11 +1193,9 @@ MRLP LDA (DESTDA),Y ; get next byte
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STA RAMRDOFF ; read from MAIN
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LDA DESTDA+1
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CLC
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ADC HIPCOFFSET
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ADC #$80
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STA DESTDA+1
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LDA #$80
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STA HIPCOFFSET ; set offset
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MRLPRTS RTS ;
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@ -2660,11 +2650,11 @@ CHOOSER2 ASC " 1 FOR KILL-THE-BIT",00
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CHOOSER3 ASC " 2 FOR 4K BASIC",00
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CHOOSER4 ASC " 3 FOR 8K BASIC",00
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CHOOSER5 ASC " 4 FOR MICROCHESS",00
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CHOOSER6 ASC " 5 FOR DISK BOOTLOADER",00
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CHOOSER6 ASC " 5 FOR DBL ROM AT $00",00
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CHOOSER7 ASC " 0 FOR NO PROGRAM",00
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CHOOSERTBL DB >CHOOSER1,<CHOOSER1,>CHOOSER2,<CHOOSER2,>CHOOSER3,<CHOOSER3
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DB >CHOOSER4,<CHOOSER4,>CHOOSER5,<CHOOSER5,>CHOOSER6,<CHOOSER6,>CHOOSER7,<CHOOSER7
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DB >CHOOSER4,<CHOOSER4,>CHOOSER5,<CHOOSER5,>CHOOSER6,<CHOOSER6
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@ -2676,7 +2666,7 @@ CHOOSERLOOP LDY CHOOSERTBL,X
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JSR STROUT ;Y=String ptr high, A=String ptr low
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JSR CROUT
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INX
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CPX #$0E
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CPX #$0C
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BNE CHOOSERLOOP
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CHOOSERWAITLOOP LDX #$00
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@ -3015,7 +3005,7 @@ DSKREADLOC DB <BASICBUFFER,>BASICBUFFER ; write to end of sim8800
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DSKTRANSFERRED DB $00,$00
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DSKFILE DB ENDDSKNAME-DSKNAME ;Length of name
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DSKNAME ASC '/SIM8800/VIRTUAL.DSK' ;followed by the name
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DSKNAME ASC '/SIM8800/ZORK.DSK' ;followed by the name
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ENDDSKNAME EQU *
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WRITEDSK JSR MLI
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