118 lines
1.6 KiB
ArmAsm
118 lines
1.6 KiB
ArmAsm
;autoload.s
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org = $BF00 ; should be $BF00
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cout = $FDED ; character out sub
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crout = $FD8E ; CR out sub
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prbyte = $FDDA
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warm = $FF69 ; back to monitor
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readblk = $FEFD
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pointer = $06
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endbas = $80C
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;target = $1000
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target = $801
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chksum = $00
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inflate = $BA00
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inf_zp = $0
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start:
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.org endbas
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move:
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ldx #0
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move1: lda moved,x
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sta load,x
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inx
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bne move1 ; move 256 bytes
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jmp load
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moved:
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.org org
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load:
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lda #<loadm
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ldy #>loadm
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jsr print
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lda ld_beg
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sta $3C ; starting tape address low
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lda ld_beg+1
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sta $3D ; starting tape address high
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lda ld_end
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sta $3E ; ending tape address low
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lda ld_end+1
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sta $3F ; ending tape address high
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jsr readblk ; read block from tape
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lda inf_flag ; if inf_flag = 0 runit
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beq runit
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inf:
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jsr crout
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lda #<infm
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ldy #>infm
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jsr print
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lda inf_src ;src lsb
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sta inf_zp+0
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lda inf_src+1 ;src msb
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sta inf_zp+1
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lda inf_dst ;dst lsb
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sta inf_zp+2
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lda inf_dst+1 ;dst msb
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sta inf_zp+3
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jsr inflate
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lda inf_end ;dst end +1 lsb
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cmp inf_zp+2
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bne error
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lda inf_end+1 ;dst end +1 msb
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cmp inf_zp+3
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bne error
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runit:
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lda warm_flag ; if warm_flag = 1 warm boot
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bne warmit
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jmp (runcode)
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warmit:
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jmp warm ; run it
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sumerror:
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jsr crout
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lda #<chkm
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ldy #>chkm
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jsr print
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error:
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lda #<errm
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ldy #>errm
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jsr print
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jmp warm
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print:
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sta pointer
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sty pointer+1
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ldy #0
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lda (pointer),y ; load initial char
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print1: ora #$80
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jsr cout
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iny
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lda (pointer),y
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bne print1
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rts
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chkm: .asciiz "CHKSUM "
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errm: .asciiz "ERROR"
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infm: .asciiz "INFLATING "
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ld_beg:
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.org *+2
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ld_end:
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.org *+2
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inf_src:
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.org *+2
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runcode:
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inf_dst:
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.org *+2
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inf_end:
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.org *+2
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inf_flag:
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.org *+1
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warm_flag:
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.org *+1
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loadm:
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;.asciiz "LOADING "
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end:
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