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View Full Version : AT&T PC 6300 video card swap? (Olivetti 224)



Fire-Flare
May 18th, 2017, 09:49 AM
Someone dropped off an AT&T PC 6300 with no monitor or keyboard. Both use non-standard connectors.

I can order a keyboard, but before I do go through the trouble of opening the machine, will I be able to run a CGA/VGA ISA card in one of these?

KenEG
May 18th, 2017, 10:08 AM
Someone dropped off an AT&T PC 6300 with no monitor or keyboard. Both use non-standard connectors.

I can order a keyboard, but before I do go through the trouble of opening the machine, will I be able to run a CGA/VGA ISA card in one of these?

I know several users on here have this machine, so you should be able to get help. The keyboard is unusual, but the video should be standard CGA. I believe this is a backplane system, but I don't know if the video card is separate from the CPU board. If it is, any 8 bit ISA video card should work.

Chuck(G)
May 18th, 2017, 10:55 AM
No--the video is not standard CGA, but you can use a VGA monitor to view it. Cable details (http://www.olivettim24.hadesnet.org/docs/video_converter.pdf) The video cards are a permanent feature--you can disable them and install a different one, but they are not removable.

Can't help on the keyboard, however.

Fire-Flare
May 18th, 2017, 11:21 AM
No--the video is not standard CGA, but you can use a VGA monitor to view it. Cable details (http://www.olivettim24.hadesnet.org/docs/video_converter.pdf) The video cards are a permanent feature--you can disable them and install a different one, but they are not removable.

Can't help on the keyboard, however.

Well that's a start, how do I disable the built-in video in favor of an add-in card?

lutiana
May 18th, 2017, 11:31 AM
Does anyone have a service manual for the 6300?

1ST1
May 18th, 2017, 11:44 AM
Search for "AT&T 6300 shrine". There you find all informations and software for it (Olivetti M24, AT&T 6300, Xerox 6060, Logabax Persona 1600, they are all the same.)

Trixter
May 18th, 2017, 01:49 PM
The keyboard is typically considered mandatory for using the system; pinout and details here (go to Olivetti M24 section): https://www.win.tue.nl/~aeb/linux/kbd/scancodes-2.html
You can use a 6300 keyboard or an M24 keyboard, they're the same. I saw a 6300 keyboard (only) on ebay a few weeks ago, it might still be there.

The display adapter can be used with a VGA monitor as described above; the adapter is simple to wire up.

Chuck(G)
May 18th, 2017, 01:53 PM
It's also on bitsavers.

lutiana
May 18th, 2017, 02:00 PM
You can use a 6300 keyboard or an M24 keyboard, they're the same. .

Or look for an Omnikey 101/102 keyboard. Apparently they can be set to be used with the 6300 (as well as XTs, ATs and Amigas). Might be a bit easier to find than an actual 6300 keyboard. Just make sure to get the one with a detachable cable, and you may need to make your own cable to physically connect it though.

Chuck(G)
May 18th, 2017, 02:02 PM
Well that's a start, how do I disable the built-in video in favor of an add-in card?

One way is to pull a PAL that decodes video addresses (I'd have to look at my own 6300 to remember); another way is to change some jumpers (see the maintenance manual).

Chuck(G)
May 18th, 2017, 02:04 PM
Or look for an Omnikey 101/102 keyboard. Apparently they can be set to be used with the 6300 (as well as XTs, ATs and Amigas). Might be a bit easier to find than an actual 6300 keyboard. Just make sure to get the one with a detachable cable, and you may need to make your own cable to physically connect it though.

The keyboard is not power-compatible--it takes +12V, as opposed to most PC keyboards which use +5.

That being said, I have a PC-ish keyboard here with pads for a 7805 regulator. I've wondered if it cam be made 6300-compatible.

lutiana
May 18th, 2017, 05:53 PM
The keyboard is not power-compatible--it takes +12V, as opposed to most PC keyboards which use +5.

That being said, I have a PC-ish keyboard here with pads for a 7805 regulator. I've wondered if it cam be made 6300-compatible.

You sure? The manual for the keyboards specifically says it would work on the 6300, though I did not did read it in much detail, so if there was a caveat I missed it.

evildragon
May 18th, 2017, 05:56 PM
The manual also says 5Vdc only. It says AT&T WGS computers, but I saw no mention of 6300.

Chuck(G)
May 18th, 2017, 06:07 PM
See that nice TO-220 on the PCB? It's what? A 7805 regulator. :)

https://deskthority.net/w/images/thumb/e/ed/Olivetti_ANK_2463_PCB_detail.JPG/800px-Olivetti_ANK_2463_PCB_detail.JPG

Also, this (http://www.olivettim24.hadesnet.org/docs/keyboard_pinout.pdf)