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Re: 8 bit cpu

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David Brown <david.brown@hesbynett.no> writes:
> On 21/12/2025 02:55, Keith Thompson wrote:
>> Kaz Kylheku <046-301-5902@kylheku.com> writes:
>>> On 2025-12-18, Keith Thompson <Keith.S.Thompson+u@gmail.com> wrote:
>>>> BGB <cr88192@gmail.com> writes:
>>>> [...]
>>>>> There are no "true" 8 bit systems in this sense, as pretty much every
>>>>> existing 8-bit CPU has had support for 16-bit operations in some way,
>>>>> though often by using register pairs.
>>>>
>>>> I vaguely recall reading about a true 8-bit system, maybe from the 1950s
>>>> or so.
>>>
>>> Any guitar pedal with an electronic bypass toggle is a 1 bit system.
>> But not a 1-bit computer.
>>
>> The system I referred to above was an actual computer with 8 bits of
>> storage.
>
> Do you really mean a total of 8 bits of storage, or do you mean
> storage addressable by 8 bits (thus avoiding the need for any 16-bit
> registers or other registers bigger than 8 bits) ?

As I wrote in the original followup, in context that was later
snipped, "It had a total of 8 bits of storage."

I think it used vacuum tubes.

I can't find a reference.  As you can imagine, web searches for
"8-bit computer" are not productive.

There could be any number of reasons why it wouldn't qualify as a
programmable computer.  I don't remember, or never knew, the details.

[...]

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */

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8 bit cpu Rosario19 <Ros@invalid.invalid> - 2025-12-18 19:20 +0100
  Re: 8 bit cpu Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-18 20:03 +0000
    Re: 8 bit cpu Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-18 20:49 +0000
  Re: 8 bit cpu BGB <cr88192@gmail.com> - 2025-12-18 16:30 -0600
    Re: 8 bit cpu Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-18 15:36 -0800
      Re: 8 bit cpu Richard Heathfield <rjh@cpax.org.uk> - 2025-12-19 01:12 +0000
      Re: 8 bit cpu Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-20 19:23 +0000
        Re: 8 bit cpu Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-20 17:55 -0800
          Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-21 13:12 +0100
            Re: 8 bit cpu Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-21 16:14 -0800
              Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-22 08:41 +0100
    Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-19 09:49 +0100
    Re: 8 bit cpu Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-20 22:24 +0000
  Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-19 09:19 +0100
    Re: 8 bit cpu bart <bc@freeuk.com> - 2025-12-19 13:43 +0000
      Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-19 16:16 +0100
        Re: 8 bit cpu bart <bc@freeuk.com> - 2025-12-19 16:05 +0000
          Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-19 18:57 +0100
            Re: 8 bit cpu bart <bc@freeuk.com> - 2025-12-20 16:19 +0000
              Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-20 18:29 +0100
  Re: 8 bit cpu Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-20 19:16 +0000
  Re: 8 bit cpu kalevi@kolttonen.fi (Kalevi Kolttonen) - 2025-12-24 01:11 +0000
    Re: 8 bit cpu Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-23 19:35 -0800
      Re: 8 bit cpu BGB <cr88192@gmail.com> - 2025-12-24 03:19 -0600

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