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Questions tagged [s-100]

The S-100 (later the IEEE696) bus is a backplane standard introduced in 1975 supporting configurable card types.

3
votes
1answer
196 views

Can anyone help provide more information regarding an operating system called I/OS by Infosoft in the early 1980's?

The title pretty much says it all. I'm looking for information about an operating system called I/OS by a company called Infosoft in the early 1980's. I think it might have been a CP/M variant and ...
5
votes
1answer
159 views

Why were the data lines of the original S-100 bus unidirectional?

The bi-directional 8-bit data bus of the Intel 8080 was split into two unidirectional 8-bit data buses. Later these two 8-bit busses would be combined to support a 16-bit data width for more advanced ...
3
votes
2answers
239 views

Can S-100 cards attach to the ZX machines?

S-100 was, as I understand, a very popular way to connect various computer equipment together in the past. Also, from what I understand, S-100 closely matches the same signals as the Intel 8080, as ...
1
vote
4answers
321 views

Intel 8080 and Altair 8800. 256 I/0 ports, but only 7 free RST (interrupt subroutine) - how it works?

I have looked this video - Altair 8800 - Interrupt Acknowledge Cycle and have few questions (I have read wikipedia Intel 8080 article, Altair 8800 Operator's manual, Charles Petzold "Code" and few ...
6
votes
1answer
182 views

Differences between 4k, 8k and Extended Altair BASIC?

Various histories state that there were at least three versions of Altair BASIC, 4k, 8k and Extended - plus modifications like Disk. I've found some listings of the 4k, but does anyone have a short ...
8
votes
1answer
406 views

Is S-100 alive?

1) Is S-100 still supported or available for serious home brew? Does anyone still actively sell new boards, cases, designing, support, etc? If not, then about what year did S-100 development stop? 2) ...
9
votes
3answers
1k views

Game cartridges on the S-100 bus?

Many Z80 computers in the seventies and early eighties used the S-100 bus, into which you could plug many kinds of expansion cards. Would it have been possible to plug suitably designed game ...
1
vote
0answers
177 views

How many CP/M machines ever shipped?

How many machines for which CP/M was the primary operating system (so not counting the Commodore 128) ever shipped? I would also be interested in knowing how many S-100 machines ever shipped. I get ...