Questions tagged [apple-1]

Topics relating to the Apple 1 computer.

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8
votes
3answers
405 views

Were any Apple 1s sold with non-ROR 6502s?

The first production runs of the MOS 6502, in mid-1975, had a bug in the ROR instruction that caused MOS to "remove" it from the instruction set by omitting it in the intial documentation. ...
2
votes
1answer
149 views

What is the format of the Apple 1 character set ROM?

What is the format of the video character ROM used in the Apple 1?
12
votes
1answer
457 views

How did the Apple 1 video circuit work?

One of the major innovations of the Apple 1 when it was released in April 1976 was that instead of using a serial interface requiring an expensive external terminal it had a built-in 40×24 text video ...
19
votes
2answers
2k views

Was there ever any real use for a 6800-based Apple 1?

This is kind of a difficult question to phrase since the Apple 1 wasn't really that well adopted of a platform - under 200 of them made and mostly abandoned by the company within 2 years. That being ...
14
votes
1answer
345 views

Could suitably-written Apple-I software force bytes into the display shift register, and do modern recreations emulate that?

The original Apple I didn't use RAM to hold the contents of the display, but instead used a group of six 1024-bit shift registers to hold the display contents and a seventh 1024-bit shift register to ...
19
votes
2answers
2k views

Why was the original Apple Computer labeled as the Apple I?

As we all know, the Apple I computer didn't last very long as it was supplanted by the hugely successful Apple II about a year later. From what I've been able to find, it seems that since Woz was the ...