Re: IBM 5140 - schematics?

[Anders Nelson via cctalk]

Hey Mike, thanks for the suggestion!

I found an eBay auction for TWO of these serial/parallel add-ons plus a
128K RAM card. If I buy this, would anyone like to take the second unit off
my hands? I have one 5140 and I intend to keep it that way.

=]

--
Anders Nelson

+1 (517) 775-6129

www.erogear.com

On Sun, May 27, 2018 at 2:10 PM, Michael Brutman 
wrote:

> Forgive me for replying to a nearly month-old post.
>
> You definitely want the "serial/parallel" slice option.  They are
> relatively cheap on eBay.  Besides all of the goodness of the serial port,
> you can also get a Xircom PE3-10BT Ethernet adapter that attaches to the
> parallel port and connect it to a modern network.
>
> Using it as a terminal is cute.  Running telnet on it natively and playing
> Netris is cool. :-)
>
> On a slightly different topic, the tech ref describes the interface to the
> LCD screen.  I have a few bad LCD screens - they have lines through them.
> I've thought about trying to debug them, but the thought of just replacing
> them outright with newer tech that can do color is really appealing too.
> (The original screens are LCDs, sometimes with a backlight option.  But
> they can do greyscale, so detecting the levels and doing color should be
> feasible.)
>
> On Sat, Apr 28, 2018 at 7:57 AM, Anders Nelson via cctalk <
> cctalk@classiccmp.org> wrote:
>
>> Hey all,
>>
>> I have an IBM 5140 portable with a printer but I'd really like to use it
>> as
>> a terminal among other things. Any chance there's documentation available
>> for that Centronics connector or another internal header with RS232 or
>> whatever?
>>
>> =]
>> --
>> --
>> Anders Nelson
>> +1 (517) 775-6129
>> www.erogear.com
>>
>
>

Re: IBM 5140 - schematics?

[Michael Brutman via cctalk]

Forgive me for replying to a nearly month-old post.

You definitely want the "serial/parallel" slice option.  They are
relatively cheap on eBay.  Besides all of the goodness of the serial port,
you can also get a Xircom PE3-10BT Ethernet adapter that attaches to the
parallel port and connect it to a modern network.

Using it as a terminal is cute.  Running telnet on it natively and playing
Netris is cool. :-)

On a slightly different topic, the tech ref describes the interface to the
LCD screen.  I have a few bad LCD screens - they have lines through them.
I've thought about trying to debug them, but the thought of just replacing
them outright with newer tech that can do color is really appealing too.
(The original screens are LCDs, sometimes with a backlight option.  But
they can do greyscale, so detecting the levels and doing color should be
feasible.)

On Sat, Apr 28, 2018 at 7:57 AM, Anders Nelson via cctalk <
cctalk@classiccmp.org> wrote:

> Hey all,
>
> I have an IBM 5140 portable with a printer but I'd really like to use it as
> a terminal among other things. Any chance there's documentation available
> for that Centronics connector or another internal header with RS232 or
> whatever?
>
> =]
> --
> --
> Anders Nelson
> +1 (517) 775-6129
> www.erogear.com
>

Re: IBM 5140 - schematics?

[Paul Berger via cctalk]

On 2018-04-28 5:00 PM, Bill Degnan via cctalk wrote:

6280655_PC_Convertable_Technical_Reference_Volume_1_Feb86.pdf

which I think I got from Bitsavers. Page 46 and following of that .pdf
(page 2-37 and following of the original manual) give the pinout and
signals on the 'I/O Channel connector' which I think is the one you
are asking about. Looks to be pretty much the 8 bit ISA bus
signals.

It's a 72 pin connector, good luck in finding something to fit it!

-tony


Surprised there is no regular rs232 port

There is an add on serial/parallel port that has a standard RS-232 port, 
they are pretty common.


Paul.

Re: IBM 5140 - schematics?

[Bill Degnan via cctalk]

>
> 6280655_PC_Convertable_Technical_Reference_Volume_1_Feb86.pdf
>
> which I think I got from Bitsavers. Page 46 and following of that .pdf
> (page 2-37 and following of the original manual) give the pinout and
> signals on the 'I/O Channel connector' which I think is the one you
> are asking about. Looks to be pretty much the 8 bit ISA bus
> signals.
>
> It's a 72 pin connector, good luck in finding something to fit it!
>
> -tony
>

Surprised there is no regular rs232 port

>

Re: IBM 5140 - schematics?

[Tony Duell via cctalk]

On Sat, Apr 28, 2018 at 3:57 PM, Anders Nelson via cctalk
 wrote:
> Hey all,
>
> I have an IBM 5140 portable with a printer but I'd really like to use it as
> a terminal among other things. Any chance there's documentation available
> for that Centronics connector or another internal header with RS232 or
> whatever?

I've never seen schematics for this machine (and as I don't own one, I
haven't reverse-engineered it).

However there is a technical reference manual,

6280655_PC_Convertable_Technical_Reference_Volume_1_Feb86.pdf

which I think I got from Bitsavers. Page 46 and following of that .pdf
(page 2-37 and following of the original manual) give the pinout and
signals on the 'I/O Channel connector' which I think is the one you
are asking about. Looks to be pretty much the 8 bit ISA bus
signals.

It's a 72 pin connector, good luck in finding something to fit it!

-tony

IBM 5140 - schematics?

[Anders Nelson via cctalk]

Hey all,

I have an IBM 5140 portable with a printer but I'd really like to use it as
a terminal among other things. Any chance there's documentation available
for that Centronics connector or another internal header with RS232 or
whatever?

=]
-- 
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com