Technology and retro computer blog

S100 boards that I've sold

When I first bought my Altair it came with many cards that I determined I just couldn't use.  Here's a description of the cards which I sold.

MITS 1K static memory
MITS 4K dynamic ram
Altair Basic & Programming package

 MITS 1K static memory
This is the original MITS 1k static ram board that came with the Altair.  This one was functional as far as I could tell from the limited front panel testing that I did.  Considering the small capacity of the ram board I decided to sell it.  I kind of regret this as the board was a great collectable, but in reality not much use for anything.


MITS 4K dynamic ram
My machine came with two of these early MITS dynamic 4k ram boards.  But by the original owners admission, both were a bit flakey.  And in my early testing I couldn't get them to work properly.  All of the MITS cards in my Altair came with the original documentation which is a huge bonus as this stuff is very hard to get hold of.


MITS 88-PIO parallel board
My machine came with a MITS parallel card.  But when I asked the owner about this card he told me that he never managed to use it for anything.  These parallel card potentially could be connected to a parallel terminal or printer.  At the time I didin't have enough knowledge of the Altair to do anything with this card.


MITS 88-ACR serial cassette board
My machine had a cassette interface board.  This board could potentially be used to load Basic and save Basic programs written by the user.  In the early stages of owning the Altair I didn't even have a working terminal so this card wasn't much use.


Altair 8k Basic v3.2 and Altair Programming Package #1 3.2 on casette
There were some copies of 8k Basic and the Altair programming package on cassette tape.  You can also see a printout of 8k Basic v3.2 actually running.  By the looks of it, the Altair must have had around 14k of working memory as the bytes free displayed on the printout is around 6k.

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