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https://github.com/deater/dos33fsprogs.git
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130 lines
2.2 KiB
ArmAsm
130 lines
2.2 KiB
ArmAsm
;license:BSD-3-Clause
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; vaguely based on the minimal open/read binary file in ProDOS filesystem
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; from 4cade
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;
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;copyright (c) Peter Ferrie 2016-2019
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.include "hardware.inc"
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.include "zp.inc"
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; start of boot sector, presumably how many sectors to load
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; 512 bytes on prodos/hard-disk(???)
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.byte 1
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proboot_start:
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txa
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pha ; save slot for later
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; init. is all this necessary?
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; originally "4cade.init.machine.a"
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cld ; clear direction flag
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sta $C082 ; read rom / no write (language card)
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sta PRIMARYCHARSET ; turn off mouse text
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sta EIGHTYCOLOFF ; disable 80-col mode
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sta CLR80COL
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sta READMAINMEM ; make sure not using aux mem
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sta WRITEMAINMEM
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sta SETSTDZP
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; more init
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; originally "4cade.init.screen.a"
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; initializes and clears screen using ROM routines
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jsr INIT_TEXT ; setup text mode
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jsr HOME ; clear screen
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jsr SETNORM ; normal text
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jsr SETKBD ; keyboard input
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jsr SETVID ; video output
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; set up disk stuff?
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pla ; restore slot
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sta UNIT ; save for later
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tax
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; X = boot slot x16
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; Y = 0
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; 4cade calls a print-title routine here that exits with Y=0
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ldy #0
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; set up ProDOS shim
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; from IIgs smartport firmware manual
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; prodos entry point is $CX00+($CXFF)
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; so if slot 7, $C700 + value in $C7ff (say, A) so $C70A
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; smartport entry point is $CX00+(CXFF)+3
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setup_loop:
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txa
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lsr
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lsr
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lsr
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lsr
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and #7
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ora #$c0
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sta slot_smc+2
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sta entry_smc+2 ; set up smartport/prodos entry point
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slot_smc:
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lda $cfff
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sta entry_smc+1 ; set up rest of smartport/prodos entry
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;opendir:
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; we want to load 5 blocks from 1024 to $1600
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QLOAD_BLOCK = 1024
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QLOAD_ADDR = $1600
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ldy #>QLOAD_BLOCK ; high
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ldx #<QLOAD_BLOCK ; low
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lda #>QLOAD_ADDR ; high
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sta ADRHI
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lda #0
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sta ADRLO
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jsr seekread
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done:
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jmp done
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;================================
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; seek read
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;================================
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; this calls the smartport PRODOS entrypoint
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; command=1 READBLOCK
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; I can't find this documented anywhere
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; but the paramaters are stored in the zero page
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;================================
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; Y:X = block number to load (???)
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; ADRHI preserved
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seekread:
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stx BLOKLO
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sty BLOKHI
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lda #1 ; READBLOCK
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sta COMMAND
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lda ADRHI
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pha
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entry_smc:
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jsr $d1d1
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pla
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sta ADRHI
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rts
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