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PICList Thread
'[PIC]: ISA board development'
2001\02\13@103154 by Octavio P Nogueira

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I need to develop an 8 bits ISA board, probably with
a 16F877 with slave PORTD.
It's a ISA to RS-232 converter, any link to help me?

Friendly Regards

Octavio Nogueira
===================================================
spam_OUTnogueiraTakeThisOuTspampropic2.com                  ICQ# 19841898
ProPic tools - low cost PIC programmer and emulator
http://www.propic2.com
===================================================

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2001\02\13@124623 by Mitch Miller

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Not meaning to be a smart-a**, but can't you buy those at almost any
computer store for $5-10?  Seems like what you describe is a standard serial
i/o adapter for a PC.  Problem might be finding ISA versions, now-a-day,
though.

--- Mitch

{Original Message removed}

2001\02\14@052035 by Octavio P Nogueira

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No, I need to emulate a serial port but I also need
to do some protocol change, so I need a PIC on it.

Friendly Regards

Octavio Nogueira
===================================================
.....nogueiraKILLspamspam@spam@propic2.com                  ICQ# 19841898
ProPic tools - low cost PIC programmer and emulator
http://www.propic2.com
===================================================

----- Original Message -----
From: "Mitch Miller" <mdmiller2spamKILLspamHOME.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Tuesday, February 13, 2001 2:47 PM
Subject: Re: [PIC]: ISA board development


> Not meaning to be a smart-a**, but can't you buy those at almost any
> computer store for $5-10?  Seems like what you describe is a standard
serial
> i/o adapter for a PC.  Problem might be finding ISA versions, now-a-day,
> though.
>
> --- Mitch
>
> {Original Message removed}

2001\02\14@102144 by James Korman

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Try this at Jameco. This board is an 8-bit serial ISA.
They do have other ISA boards.


http://www.jameco.com/cgi-bin/ncommerce3/ProductDisplay?prmenbr=91&prrfnbr=2743&cgrfnbr=827&ctgys=504;542;827;

Mitch Miller wrote:
>
> Not meaning to be a smart-a**, but can't you buy those at almost any
> computer store for $5-10?  Seems like what you describe is a standard serial
> i/o adapter for a PC.  Problem might be finding ISA versions, now-a-day,
> though.
>
> --- Mitch
>
> {Original Message removed}

2001\02\14@170813 by Wojciech Zabolotny

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On Wed, Feb 14, 2001 at 08:16:28AM -0300, Octavio P Nogueira wrote:
> No, I need to emulate a serial port but I also need
> to do some protocol change, so I need a PIC on it.
>

In fact prices of good multiport RS-232 boards are so high (just check eg.
Cyclades), that it could be nice to develop an Open Hardware version.
I thought about it, however I wanted to connect the PORTD of 16F877 to the
parallel port and use the "bit banging" technology to get 5 RS-232 ports
(Tx, Rx, RTS, CTS).
Certainly each of them should provide the FIFO queue (like 16550A does).
The problem is however how to multiplex the data to/from 5 RS232 ports,
using single 8-bit PORTD. Probably a special protocol using the "escape"
characters would be necessary. Maybe someone could suggest any good
solution...

 Unfortunately this project is on the very last position on my list of
hobbyist projects...
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2001\02\14@172406 by Peter L. Peres

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Why ISA->RS232 with PIC ? It can be done but the usual way is a NS16550(A)
USART and a HCT688 address decoder (and a MAX232 or or other line
interface). You will also have to write a driver for your OS so it is
better if you stick with the USART register model and use standard
drivers. You will also need a single open drain (or collector) driver
for the interrupt line. Get a datasheet of a 16550 or a schematic of an
old additional serial port for clues. These were common in XT days.

Peter

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2001\02\15@023458 by Vasile Surducan

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Wojciech, if you are interested I can send you an ISA, 16bit expansion
board made by Emulex. It has 1M ram and 80286 onboard. Two programable
RS232 or 485 or VT xxx ( 6 different interfaces mode ). Full
documentation. With this board you may add another two RS232 + four on
your computer = six. Enough I hope.
Vasile

On Wed, 14 Feb 2001, Wojciech Zabolotny wrote:

{Quote hidden}

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2001\02\15@050038 by Bill Westfield

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> > No, I need to emulate a serial port but I also need
> > to do some protocol change, so I need a PIC on it.

I think you'd save yourself a world of trouble (especially since intel
wants to get RID of the ISA bus) if you can move the PIC and the
protocol change to AFTER the rs232 port.  Ie - use a magic PIC
daughter card that plugs into the 1489 sockets or hangs off of the
db25 port and has a special connector to get power.

BillW

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2001\02\15@181325 by Wojciech Zabolotny

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On Thu, Feb 15, 2001 at 09:14:01AM +0200, Vasile Surducan wrote:
> Wojciech, if you are interested I can send you an ISA, 16bit expansion
> board made by Emulex. It has 1M ram and 80286 onboard. Two programable
> RS232 or 485 or VT xxx ( 6 different interfaces mode ). Full
> documentation. With this board you may add another two RS232 + four on
> your computer = six. Enough I hope.
> Vasile

Thanks, however in fact the development of such LPT/RS232 converter is
interesting idea itself, and I think it could be useful for many users.
Especially it could be usefull for connecting many RS232 controlled devices
to a laptop.
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2001\02\15@221348 by Bob Ammerman

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> Thanks, however in fact the development of such LPT/RS232 converter is
> interesting idea itself, and I think it could be useful for many users.
> Especially it could be usefull for connecting many RS232 controlled
devices
> to a laptop.

Modern laptops have USB ports,

127 Serial ports anybody :-)

I have 3 on my laptop, COM1: and two on USB. Very helpful for running the
ICD on one port and talking to the device under test on another.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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