mirror of
https://github.com/Pecusx/jataricart.git
synced 2026-05-20 22:33:22 +02:00
Jakub Husak
34 lines
712 B
NASM
34 lines
712 B
NASM
TRIGGER_FORMAT_29SF equ $10
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C_FORMAT_29SF equ $80
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C_BYTE_PROG_29SF equ $a0
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flashoppreamble_29SF
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pha
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lda #C_BYTE_PROG_29SF
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scc
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lda #C_FORMAT_29SF ; only if c set
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sta command_ZP
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pla
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.byte {bit.w}
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flashoppreamble_acc_29SF ; 29sf040
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sta command_ZP
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txa
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pha
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; when write byte x must be set to either 0 or 40 temporarily
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and #$40
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tax
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sta $d500,x
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mva #$aa $a555 ; $555<$aa
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mva #$55 $a2aa ; $2aa<$55
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; $555<command
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mva command_ZPff $a555; will become command: FORMAT/ID_MODE/BYTE_PROG
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cmp #C_FORMAT_29SF
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bne @+ ; if not FORMAT, procedure finishes
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; FORMAT part, more to write
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mva #$aa $a555 ; $555<$aa
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mva #$55 $a2aa ; $2aa<$55
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; PREPARE FOR SECTOR TO ERASE
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@ pla
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tax
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flash_unlockchip_29SF
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rts
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