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G0FTD > IBM 08.05.04 23:45l 32 Lines 985 Bytes #999 (0) @ WW
BID : 9D5222G0FTD
Read: GUEST DC9BM
Subj: Re: Serial I/O from LPT1 ??
Path: DB0FHN<DB0FOR<DB0MRW<OK0PPL<DB0RES<ON0BEL<CT4DK<ZL2TZE<GB7YFS<GB7CIP<
GB7SXE
Sent: 040508/1811Z @:GB7SXE.#38.GBR.EU #:47235 [Hastings] FBB7.00i $:9D5222G0FT
From: G0FTD@GB7SXE.#38.GBR.EU
To : IBM@WW
VK6JY wrote:-
>
> Can you supply a simple machine code routine to do serial I/O
> from a PC at TTL level from a parallel port without a UART in
> hardware - a software UART is the essential requirement.
>
> It would suit my purpose if there were two routines that can
> be called from say Q-BASIC to allow TTL ASCII transfers such
> as to a radio without RS-232c level signalling.
>
> A baudrate range including 4800 is needed.
I can't help but the following my give some clues.
I recently sent a small file called EMBAYCOM which allowed the LPT port
when combined with the serial port to allow a HAMCOM interface to be used
on packet for tx and rx.
I think it's max speed was 1k2 and the LPT port generated the tones
whilst the serial port was the receive side of things.
I don't know your intended application, but perhaps this might give a clue
as to the capabilites of using an LPT port ?
Sorry I can't help anymore.
- Andy -
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