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Read text and data offset/length

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This commit is contained in:
Byron Lathi
2023-08-25 19:22:21 -07:00
parent becc9094c8
commit 21b456067a
3 changed files with 209 additions and 133 deletions
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76
sw/bios/boot2.s
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@@ -11,6 +11,14 @@
fatbuf = $A000
filebuf = $B000
.zeropage
tbase: .res 2
tlen: .res 2
dbase: .res 2
dlen: .res 2
.segment "BOOTLOADER"
sectors_per_cluster = $800D
@@ -18,6 +26,20 @@ reserved_sectors = $800E
fat_count = $8010
sectors_per_fat = $8024
O65_NO_C65 = $00
O65_MAGIC = $02
O65_VERSION = $05
O65_MODE = $06
O65_TBASE = $08
O65_TLEN = $0a
O65_DBASE = $0c
O65_DLEN = $0e
O65_BBASE = $10
O65_BLEN = $12
O65_ZBASE = $14
O65_ZLEN = $16
O65_STACK = $18
_start:
lda #<str
ldx #>str
@@ -151,6 +173,60 @@ _start:
ldx #>filebuf
jsr _SD_printBuf
lda #<word_str
ldx #>word_str
jsr pushax
ldy #O65_TBASE
lda filebuf,y
sta tbase
iny
ldx filebuf,y
stx tbase + 1
jsr pushax
ldy #$4
jsr _cprintf
lda #<word_str
ldx #>word_str
jsr pushax
ldy #O65_TLEN
lda filebuf,y
sta tlen
iny
ldx filebuf,y
stx tlen + 1
jsr pushax
ldy #$4
jsr _cprintf
lda #<word_str
ldx #>word_str
jsr pushax
ldy #O65_DBASE
lda filebuf,y
sta dbase
iny
ldx filebuf,y
stx dbase + 1
jsr pushax
ldy #$4
jsr _cprintf
lda #<word_str
ldx #>word_str
jsr pushax
ldy #O65_DLEN
lda filebuf,y
sta dlen
iny
ldx filebuf,y
stx dlen + 1
jsr pushax
ldy #$4
jsr _cprintf
@end: bra @end