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View Full Version : Interior mostly modified Altair 8800 spotted on ebay.



leiy
January 28th, 2015, 06:16 PM
This one is severely modified.

There has a nice 88 2 SIO rev 0 board in the case. I still have no 88 2 SIO board in collection.

The back of this Altair also drilled.

http://www.ebay.com/itm/331462324818?

Seems in none working condition.

leiy
January 29th, 2015, 12:37 AM
I just ordered an Altairclone computer, to take the full experience of Altair.

Corey986
January 29th, 2015, 01:43 AM
This one is severely modified.

There has a nice 88 2 SIO rev 0 board in the case. I still have no 88 2 SIO board in collection.

The back of this Altair also drilled.

http://www.ebay.com/itm/331462324818?

Seems in none working condition.

The machine started out as an 8800A I think, the serial number sticker is missing also. I think the only thing Rev-0 is the 2SIO, which is a later card that was released well after the Rev-0 Atair. at one point it had a cassette board set also since the wiring is there. I think this seller purposely wrote their title to try to trick someone into buying the machine.

TJ_Mossman
January 29th, 2015, 03:26 AM
The machine started out as an 8800A I think, the serial number sticker is missing also. I think the only thing Rev-0 is the 2SIO, which is a later card that was released well after the Rev-0 Atair. at one point it had a cassette board set also since the wiring is there. I think this seller purposely wrote their title to try to trick someone into buying the machine.

What are the telltale signs of an 8800a?

Corey986
January 29th, 2015, 04:23 AM
http://www.vintage-computer.com/altair8800a.shtml

One of the big weak points in the early Altair was the motherboards. 4slot Rev-0 were too thin, rev-1 still sucked so companies like processor tech created 18 slot single piece motherboards. So MITS did the same and made the A model. This one on eBay looks like a MITS large motherboard. The PT one had terminators and different card guides. This one looks like it has MITS card guides, another weak point as they break easily.

Then MITS fixed the other major weak point the power supply in the "B" model among other things.

Cheers,
Corey

snuci
January 29th, 2015, 05:36 AM
While I usually defer to Corey for his expertise, this example is actually an early 8800 with an upgraded backplane and added fan. Tell-tale signs include the "straight line" graphic on the front panel and the black capacitors (that looks like D cell batteries) on the inside.

TJ_Mossman
January 29th, 2015, 05:38 AM
http://www.vintage-computer.com/altair8800a.shtml

One of the big weak points in the early Altair was the motherboards. 4slot Rev-0 were too thin, rev-1 still sucked so companies like processor tech created 18 slot single piece motherboards. So MITS did the same and made the A model. This one on eBay looks like a MITS large motherboard. The PT one had terminators and different card guides. This one looks like it has MITS card guides, another weak point as they break easily.

Then MITS fixed the other major weak point the power supply in the "B" model among other things.

Cheers,
Corey

Hmm, I think the motherboard is from Jade Computer Products (http://s100computers.com/Hardware%20Folder/Jade/History/History.htm), if you look closely at the pics you can make out most of the logo. The card guides also aren't screwed directly to the board like they were on the MITS board, and the front panel connections appear to be soldered to that small board with the resistors. I still wouldn't be suprised if this is a rebadged 8800a though.

Corey986
January 29th, 2015, 07:35 AM
You guys might be right I was using my iPhone to view the pictures not the best resolution

Corey986
January 29th, 2015, 10:33 PM
OK, finally got to a computer with a big screen. Yep, this is obviously not a MITS motherboard, should have noticed it earlier. Interesting how the MITS card edge guides are used. Looks like they drilled the chassis to attach them. So this was either a rev-0 or rev-1 machine but that has been "upgraded" back in the day.

Cheers,
Corey