mirror of
https://github.com/Pecusx/jataricart.git
synced 2026-05-20 22:33:22 +02:00
Jakub Husak
39 lines
830 B
NASM
39 lines
830 B
NASM
TRIGGER_FORMAT_29F equ $10
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C_FORMAT_29F equ $80
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C_BYTE_PROG_29F equ $a0
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M_SSIZE_29F equ $10000 ; sector size; MAXFlash, protocol compatible with 39sf0x0
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command_ZP = $f0
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flashoppreamble_29F
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pha
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lda #C_BYTE_PROG_29F
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scc
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lda #C_FORMAT_29F ; 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_29F ; 39sf0x0, 29F040
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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 $d502,x
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mva #$aa $b555 ; $5555<$aa
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sta $d501,x
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mva #$55 $aaaa ; $2aaa<$55
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; $5555<$80
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sta $d502,x
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mva command_ZPff $b555; will become command: FORMAT/ID_MODE/BYTE_PROG
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cmp #C_FORMAT_29F
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bne @+ ; if not FORMAT, procedure finishes
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; FORMAT part, more to write
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sta $d502,x
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mva #$aa $b555 ; $5555<$aa
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sta $d501,x
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mva #$55 $aaaa ; $2aaa<$55
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@ pla
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tax
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flash_unlockchip_29F
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rts
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