141 lines
1.4 KiB
ArmAsm
141 lines
1.4 KiB
ArmAsm
*
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* SECOND STAGE BOOT
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*
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ORG $B700
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OBJ $8000
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*
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TEMP EQU 7
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SWAPEDIT EQU $1E00
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*
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STX SLOT
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STX SLOTFOUND
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STX BOOTSLOT
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LDA #1
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STA DRIVE
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STA DRIVEFOUND
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TXA
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LSR
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LSR
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LSR
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LSR
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TAX
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LDA #0
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STA $1FD8,X
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STA $1FD0,X
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LDA #13
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STA SECTORCOUNT
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LDA #1
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LDX #12
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LDY #$B5
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JSR READSECTORS
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*
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LDA #1
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STA SECTORCOUNT
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LDA #3
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LDX #8
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LDY #$40
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JSR READSECTORS
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*
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LDA #23
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STA SECTORCOUNT
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LDA #3
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LDX #6
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LDY #$1E
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JSR READSECTORS
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*
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LDA #32
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STA SECTORCOUNT
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LDA #5
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LDX #15
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LDY #$3F
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JSR READSECTORS
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*
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STA $C050
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STA $C052
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STA $C054
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STA $C057
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STA $C010
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TIME LDA #20
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STA TEMP
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TIM2 LDA $C000
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ORA $C061
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ORA $C062
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BMI TIM3
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LDA #0
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JSR $FCA8
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DEC TEMP
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BPL TIM2
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TIM3 EQU *
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*
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LDX #$FF
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TXS
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JMP SWAPEDIT
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*
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READSECTORS STA TRACK
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STX SECTOR
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STY READBUFHI
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LDA #1
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STA CMDCODE
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READS2 LDA #>RWTSPARMS
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LDY #<RWTSPARMS
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JSR RWTSCALL
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BCS READS2
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LDY SECTOR
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DEY
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BPL READS3
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LDY #15
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DEC TRACK
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READS3 STY SECTOR
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DEC READBUFHI
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DEC SECTORCOUNT
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BNE READS2
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RTS
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*
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DS $3
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*
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RWTSCALL PHP
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SEI
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JSR $BD00
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BCS BADCALL
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PLP
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CLC
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RTS
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BADCALL PLP
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SEC
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RTS
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*
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BOOT2PARMS EQU *
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SECTORCOUNT HEX 00
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BOOTSLOT HEX 00
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*
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DS $12
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*
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BZERO LDA #0
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TAY
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BZER2 STA ($42),Y
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INY
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BNE BZER2
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RTS
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*
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DS $9
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*
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RWTSPARMS EQU *
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TABLETYPE HEX 01
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SLOT HEX 00
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DRIVE HEX 00
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VOLUME HEX 00
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TRACK HEX 00
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SECTOR HEX 00
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DA DEVCHARTBL
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READBUFLO HEX 00
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READBUFHI HEX 00
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HEX 00
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HEX 00
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CMDCODE HEX 00
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ERRCODE HEX 00
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VOLFOUND HEX 00
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SLOTFOUND HEX 00
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DRIVEFOUND HEX 00
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*
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DEVCHARTBL HEX 00,01,EF,D8
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