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80 lines
1.4 KiB
ArmAsm
80 lines
1.4 KiB
ArmAsm
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.include "lynx.inc"
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.include "extzp.inc"
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.interruptor _UpLoaderIRQ
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.export __UPLOADER__: absolute = 1
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load_len=_FileDestAddr
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load_ptr=_FileFileLen
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load_ptr2=_FileCurrBlock
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.segment "UPCODE"
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ComLynxReadAndExec:
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ldy #4
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loop0:
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jsr read_byte
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sta load_len-1,y
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dey
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bne loop0 ; get destination and length
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tax ; lowbyte of length
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lda load_ptr
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sta load_ptr2
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lda load_ptr+1
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sta load_ptr2+1
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loop1:
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inx
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bne cont1
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inc load_len+1
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bne cont1
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jmp (load_ptr)
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cont1:
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jsr read_byte
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sta (load_ptr2),y
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sta PALETTE ; feedback ;-)
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iny
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bne loop1
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inc load_ptr2+1
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bra loop1
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read_byte:
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bit SERCTL
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bvc read_byte
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lda SERDAT
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rts
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_UpLoaderIRQ:
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lda INTSET
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and #$10
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bne @L0
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clc
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rts
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@L0:
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lda SERDAT ; wait for the start sequence
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bit flag ; already seen $81 ?
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bpl again ; >= 0 => no
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cmp #$50 ; "P" ?
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bne again ; not correct, so clear flag
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sei
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jmp ComLynxReadAndExec
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again:
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stz flag
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cmp #$81
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bne exit
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sta flag
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;
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; last action : clear interrupt
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;
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exit:
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clc
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rts
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.segment "UPDATA"
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flag:
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.byte 0
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