[A83] Re: Printerdriver for the TI-83(+)
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[A83] Re: Printerdriver for the TI-83(+)
> > sendData:
> > ld a,(hl) ;hl=input
> > inc hl
> > or a
> > jr z,sendDataDone
> > ld b,8
> > ld c,a
> > sendByteLoop:
> > ..[wait]..
> > rr c
> > jr c,sendBit1
> > sendBit0:
> > ld a,$C0
> > jr sendBitDone
> > sendBit1:
> > ld a,$C3
> > sendBitDone:
> > out (0),a
> > djnz sendByteLoop
> > jr sendData
> > sendDataDone:
> > ld hl,txt
> > bcall(_puts)
> > ret
> > txt:
> > .db "Thank you for "
> > .db "using [name] "
> > .db "made by http:// "
> > .db "zeekoe.cjb.net "
> > .db "Thanks to: "
> > .db [list of names]
>;I'm just starting asm coding (well, 6 months probably)
>;so I don't know many commands. What does 'rr' do? Roll
>;Right & bit? This could be extremely useful, because
>;if the bits should be rolled left it can be done by
>;changing one command instead of 8.
Yes, 'rr' Rotates a byte Right. In this case register C. If the bit that
falls of is set, then 'rr' sets the carry, if not then it doesn't.
About that delay you need, I can't really help. I think you should start
looking for more specific information about the communication protocol. What
bytes do what, etc.
What also might help is a computer program that scans the serial port for
data and tells you in what speed the data gets send or something.
Tijl Coosemans
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