mirror of
https://github.com/AppleWin/AppleWin.git
synced 2024-12-23 16:30:23 +00:00
165 lines
2.3 KiB
Plaintext
165 lines
2.3 KiB
Plaintext
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AppleWin behaviour: (ddial.dsk)
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- 1.10.4 : Counts up immediately at correct rate (but no "login" msg)
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- 1.12.6 : Counts up immediately at correct rate (but no "login" msg)
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- 1.12.9.1 : Sticks at 2s, then starts counting slowly after ~30s (but no "login" msg)
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- 1.14.2 : Very fast counting immediately
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NB:
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. "Login" msg output ~33s/34s
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. After option-1 is loaded, then it writes to some regs in slot-1 ($C0An), but no reads.
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=======================================
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$38EB:
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LDA $28 ; [$28] = #$00
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BMI .SKIP_UPDATE_TIME ; $38FF
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LDA $F4 ; [$F8] = #$FF
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BNE $38F8
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LDA #$80+' '
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STA SEC_HI-1
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$38F8:
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LDA #$84
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STA $28
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JSR UPDATE_TIME
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.SKIP_UPDATE_TIME:
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JSR $7FD3
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JSR $4753
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JSR CHECK_VBL
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;...
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=======================================
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$395F:
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LDA $F4
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CMP #$01
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BCC $3979
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LDA TAPEIN
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TAY
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$3969:
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EOR #$00 ; Default?
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BPL $3979
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; State change on TAPEIN
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STY $3969+1
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LDA #$0A
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STA $F4
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STA $28
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LDA TAPEOUT
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$3979:
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JMP $28B4
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=======================================
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; Func entrypoint
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UPDATE_TIME: ; $5205
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LDX $FF ; [$FF] = #$FF
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BEQ $5220
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BPL $520D
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LDX #$09
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$520D:
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DEX
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STX $FF
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BNE $5220
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;...
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$523D:
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LDX #$07
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$523F:
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LDA $A0,X
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;...
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DEC $38,X
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BNE $5289
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LDA #$00
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STA $90,X
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$5289:
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DEX
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BPL $523F
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$528C:
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INC $4A7 ; SEC_LO
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LDA $4A7
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CMP #$80+'9'+1 ; #$BA
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BNE $530A
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; $4A6 = SEC_HI
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;...
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$530A:
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RTS
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=======================================
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CHECK_VBL: ; $F822
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LDA RDVBLBAR
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$F825: ; FRMCNT = $F826
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EOR #$3C ; (*SMC)
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BMI $F82A
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RTS
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; VBl changed
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$F82A:
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LDA FRMCNT
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EOR #$80
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STA FRMCNT
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BMI $F86A
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; 1 frame elasped
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INC $30 ; [$30] = #$FF
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AND $7F9F ; [$7F9F] = #$01
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BNE $F83D
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STA $F2 ; [$F2] = #$01
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$F83D:
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DEC FRMCNT
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BNE $F86A
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; 1 sec elasped
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$F842: ; FRMCNT2 = $F843
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LDA #$3C ; (*SMC)
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STA FRMCNT
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DEC FRAMECNT3
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BNE $F861
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PHP
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CMP #60 ; #$3C
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BCS $F858 ; Branch if A >= 60
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INC FRMCNT2
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LDA #$79 ; 121 = 60*2+1
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BNE $F85D ; == BRA $F85D
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$F858:
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DEC FRMCNT2
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LDA #$0A
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$F85D:
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STA FRAMECNT3
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PLP
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$F861:
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LDA $F4 ; [$F4] = #$FF
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BNE $F86B
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STA $28 ; [$28] = #$00
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LDA TAPEOUT
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RTS
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$F86A:
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RTS
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$F86B:
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DEC $F4
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RTS
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FRAMECNT3: ; $F86E
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DCB $01
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