[A83] Re: Distance RAM clearer :-)
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[A83] Re: Distance RAM clearer :-)
> From: "Ronald Teune" <rtwolf@gmx.net>
>
> Does someone know how to use this?
> It could make things a lot easyer, I think.
> Ronald
>
> ASM_IND_VALUE
> -------------
>
> 19d REC1STBYTE : This routine goes into idle
> or low power mode and waits for
> the data lines to change. Then
> reads a byte of data using the TI-83
> bit protocol. This only reads the 1st
> byte of data. The byte is returned
> in the accumlator.
>
> 20d REC1STBYTENC : The same as REC1STBYTE except
> that the cursor does not flash.
> The byte is returned in the
> accumulator.
>
> 22d RECABYTE : This routine looks at the data
> lines for activity for about
> 2 seconds and reads in a single
> byte of data. If no data is found
> an error will be generated.
> The byte is returned in the
> accumulator.
>
> 11d SENDABYTE : This routine sends a byte of
> data across the data lines
> using the TI-83 bit protocol. If
> there is no response within about 2
> seconds an error is generated.
> The data to be sent needs to be in
> the accumulator.
You should load (asm_ind_call) with one of the values (19d, 20d, 22d, 11d)
and then call _io_exec. This routine checks the value stored at
(asm_ind_call) and then calls the necessary routines. Do know that these
routines generate system errors.
example: ; (let the calc wait until a byte is received)
ld a,19
ld (asm_ind_call),a
call _io_exec
Tijl Coosemans
References: