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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Newsgroups | comp.os.linux.misc, alt.unix.geeks |
| Subject | Re: CPU architecture (was Re: Mercury) |
| Followup-To | alt.unix.geeks |
| Date | 2026-04-03 15:11 +0200 |
| Message-ID | <ktq4amxpo1.ln2@Telcontar.valinor> (permalink) |
| References | (20 earlier) <njt0amx477.ln2@Telcontar.valinor> <8f2cnUWvT4L8SFD0nZ2dnZfqnPidnZ2d@giganews.com> <20260402104302.00007623@gmail.com> <10qmdf3$1athg$8@dont-email.me> <hz6dnYbHp57II1P0nZ2dnZfqnPSdnZ2d@giganews.com> |
Cross-posted to 2 groups.
Followups directed to: alt.unix.geeks
{Note Followups-To} ==== means ====> do not post on comp.os.linux.misc
On 2026-04-02 21:06, c186282 wrote:
> On 4/2/26 14:44, The Natural Philosopher wrote:
>>
>> On 02/04/2026 18:43, John Ames wrote:
>>> The basics aren't really that complex; a Platonic CPU is just a state
>>> machine sequencing the operation of an ALU and register file according
>>> to a rules table, with some of its outputs directing the flow from one
>>> state to another, and the clock latching the prior out-state to become
>>> the in-state for the next operation, like a two-stroke engine.
>>>
>>> while (!halt) {
>>> state = rulesTable[state];
>>> }
>>
>> I looked at that, thought about it, and them realised that it is
>> exactly correct.
>>
>> And is probably the neatest way of describing a Turing machine
>
> Now start wiring up transistors to DO it.
>
> NOT so clear and easy eh ?
It is trivial.
You draw the block diagram, then expand to the individual gates, then
replace each gate with its transistors. Just a copy paste job.
>
> You fetch instruction zero from the ROM *how* ?
Place a voltage in the read memory line. Place several voltages in the
address bus. Repeat for all necessary lines. Subsequently, read the data
bus, store the contents in the instruction register.
> You start decoding it *how* ?
A big multiplexer.
> You use the decode
> to route more info here and there *how* ? I'm
> talking WIRING here, hardware, how it's really done.
>
> I may look into the 4004 again, but frankly I'm getting
> too old to dive deep on this kind of stuff. I'll just
> have to accept that CPUs work on magic smoke.
Somebody posted recently the transistor schematic of a simple CPU. Just
look at it. Ah, Paul.
+++--------------------
This SVG (Scalable Vector Graphics) file is a representation of the 6502
at transistor level.
The size of the transistors is intended to show drive strength, some
bus driver pads having more milliamps of drive than other signals.
https://davidmjc.github.io/6502/cd.svg
( https://davidmjc.github.io/6502/ )
--------------------++-
From: Paul <nospam@needed.invalid>
Newsgroups: alt.os.linux,alt.comp.os.windows-11
Subject: Re: Is it possible .....??
Date: Mon, 23 Mar 2026 20:28:17 -0400
Organization: A noiseless patient Spider
Lines: 67
Message-ID: <10pslr2$kc1a$1@dont-email.me>
--
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;
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Re: Mercury c186282 <c186282@nnada.net> - 2026-04-02 13:33 -0400
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Re: Mercury c186282 <c186282@nnada.net> - 2026-04-03 11:06 -0400
Re: Mercury Rich <rich@example.invalid> - 2026-04-03 16:51 +0000
Re: Mercury c186282 <c186282@nnada.net> - 2026-04-03 14:47 -0400
CPU architecture (was Re: Mercury) John Ames <commodorejohn@gmail.com> - 2026-04-03 12:57 -0700
Re: CPU architecture (was Re: Mercury) c186282 <c186282@nnada.net> - 2026-04-03 22:45 -0400
Re: CPU architecture (was Re: Mercury) Rich <rich@example.invalid> - 2026-04-04 03:27 +0000
Re: CPU architecture (was Re: Mercury) rbowman <bowman@montana.com> - 2026-04-04 04:57 +0000
CPU design "Carlos E.R." <robin_listas@es.invalid> - 2026-04-03 22:00 +0200
Re: CPU design c186282 <c186282@nnada.net> - 2026-04-03 16:29 -0400
Re: CPU design "Carlos E.R." <robin_listas@es.invalid> - 2026-04-04 13:20 +0200
Re: CPU design c186282 <c186282@nnada.net> - 2026-04-04 13:57 -0400
Re: CPU design "Carlos E.R." <robin_listas@es.invalid> - 2026-04-04 22:18 +0200
Re: CPU design Rich <rich@example.invalid> - 2026-04-05 03:44 +0000
Re: CPU design "Carlos E.R." <robin_listas@es.invalid> - 2026-04-05 13:58 +0200
Re: CPU design c186282 <c186282@nnada.net> - 2026-04-05 17:19 -0400
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Re: Mercury Rich <rich@example.invalid> - 2026-04-03 21:57 +0000
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Re: Mercury Rich <rich@example.invalid> - 2026-04-04 14:32 +0000
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Re: Mercury "Carlos E.R." <robin_listas@es.invalid> - 2026-04-05 13:59 +0200
Re: Mercury The Natural Philosopher <tnp@invalid.invalid> - 2026-04-05 13:10 +0100
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Re: Mandriva was Re: Mercury rbowman <bowman@montana.com> - 2026-04-06 16:02 +0000
Re: Mandriva was Re: Mercury Rich <rich@example.invalid> - 2026-04-06 18:09 +0000
Re: Mandriva was Re: Mercury rbowman <bowman@montana.com> - 2026-04-07 02:15 +0000
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Re: Mercury The Natural Philosopher <tnp@invalid.invalid> - 2026-04-06 11:01 +0100
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Re: CPU architecture (was Re: Mercury) The Natural Philosopher <tnp@invalid.invalid> - 2026-04-02 19:44 +0100
Re: CPU architecture (was Re: Mercury) c186282 <c186282@nnada.net> - 2026-04-02 15:06 -0400
Re: CPU architecture (was Re: Mercury) The Natural Philosopher <tnp@invalid.invalid> - 2026-04-03 10:32 +0100
Re: CPU architecture (was Re: Mercury) rbowman <bowman@montana.com> - 2026-04-03 23:58 +0000
Re: CPU architecture (was Re: Mercury) "Carlos E.R." <robin_listas@es.invalid> - 2026-04-03 15:11 +0200
Re: CPU architecture (was Re: Mercury) c186282 <c186282@nnada.net> - 2026-04-02 14:56 -0400
Re: CPU architecture (was Re: Mercury) John Ames <commodorejohn@gmail.com> - 2026-04-02 15:31 -0700
Re: CPU architecture (was Re: Mercury) c186282 <c186282@nnada.net> - 2026-04-02 22:46 -0400
Re: CPU architecture (was Re: Mercury) rbowman <bowman@montana.com> - 2026-04-03 07:03 +0000
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Re: CPU architecture (was Re: Mercury) Richard Kettlewell <invalid@invalid.invalid> - 2026-04-03 10:04 +0100
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Re: CPU architecture (was Re: Mercury) c186282 <c186282@nnada.net> - 2026-04-03 10:35 -0400
Re: CPU architecture (was Re: Mercury) rbowman <bowman@montana.com> - 2026-04-03 07:00 +0000
Re: CPU architecture (was Re: Mercury) The Natural Philosopher <tnp@invalid.invalid> - 2026-04-03 11:27 +0100
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Re: CPU architecture (was Re: Mercury) Rich <rich@example.invalid> - 2026-04-03 03:45 +0000
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Re: CPU architecture (was Re: Mercury) c186282 <c186282@nnada.net> - 2026-04-03 15:04 -0400
Re: CPU architecture (was Re: Mercury) The Natural Philosopher <tnp@invalid.invalid> - 2026-04-03 10:13 +0100
Re: CPU architecture (was Re: Mercury) Rich <rich@example.invalid> - 2026-04-03 00:29 +0000
Re: Mercury rbowman <bowman@montana.com> - 2026-04-02 19:50 +0000
Re: Mercury Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-04-02 20:53 +0000
Re: Mercury The Natural Philosopher <tnp@invalid.invalid> - 2026-04-03 10:51 +0100
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