Hello All!
For early pre-micro CPU's i.e., before the Intel 8080 suggest you look at
the Intel 4004 and 4040 (assuming that one is listed on any site.
Multi 4004's made up the basic 8080 allthough other logic had to be added.
On Sun, 27 Feb 2022 14:53:47 +1200 nospam.Vincent.Coen@f1.n250.z2.fidonet.org (Vincent Coen) wrote:
Hello All!
For early pre-micro CPU's i.e., before the Intel 8080 suggest you
look at the Intel 4004 and 4040 (assuming that one is listed on any
site.
Those are both microprocessors - the 4004 is usually considered
the first microprocessor. For a construction project for a home
computer based on the 4040 Practical Electronics published the CHAMP
project in 1977 - I did once find reprints online but not this time
round.
Multi 4004's made up the basic 8080 allthough other logic had to be
added.
Er no, the 8080 was not multiple 4004s or even 4040s it was an 8
bit CPU spread over a three chip set, CPU, Bus interface and Clock generator, it also required 12V, 5V and -5V supplies. the Z80 won out
over the 8080 more for it's single chip 5V only convenience than the
extra instructions that hardly anyone used.
Er no, the 8080 was not multiple 4004s or even 4040s it was an 8 bit
CPU spread over a three chip set, CPU, Bus interface and Clock generator,
On Sun, 27 Feb 2022 16:38:27 +0000, Ahem A Rivet's Shot
<steveo@eircom.net> declaimed the following:
Er no, the 8080 was not multiple 4004s or even 4040s it was an 8
bit
CPU spread over a three chip set, CPU, Bus interface and Clock generator,
The 8228 "system controller" chip wasn't a required chip --
I've /seen/ systems built using five 8212 8-bit tri-state buffers (heck,
I still have an Intel $20 evaluation kit that shipped with 8080A, clock
the Z80 won out over the 8080 more for it's single chip 5V only
convenience than the extra instructions that hardly anyone used.
In message <20220227163827.099df7b66fdf32b7b5912203@eircom.net>
Ahem A Rivet's Shot <steveo@eircom.net> wrote:
the Z80 won out over the 8080 more for it's single chip 5V only
convenience than the extra instructions that hardly anyone used.
I was very definitely one of your "hardly anyone".
On 27 Feb 2022 at 22:30:47 GMT, David Higton <dave@davehigton.me.uk> wrote:
In message <20220227163827.099df7b66fdf32b7b5912203@eircom.net>
Ahem A Rivet's Shot <steveo@eircom.net> wrote:
the Z80 won out over the 8080 more for it's single chip 5V only
convenience than the extra instructions that hardly anyone used.
I was very definitely one of your "hardly anyone".
I tried to use them but not sure I found them very convenient.
I'm guessing that way was cheaper in chip cost and more expensive
in board area, hole count etc - the kind of things that only matter in >production.
The Newbrain was first prototyped on double eurocard wire-wrap
boards, I got very slick with a wire-wrap gun on that job.
On Sun, 27 Feb 2022 20:10:03 +0000, Ahem A Rivet's Shot
<steveo@eircom.net> declaimed the following:
I'm guessing that way was cheaper in chip cost and more expensive
in board area, hole count etc - the kind of things that only matter in >production.
The "system" I'd seen in use with the mass of 8212s, if you'd
believe it, was the floppy disk controller board used on a CRDS LSI-11.
However, as a two-session per week, 11 week course, we
never really got far in wiring up candidate systems (S-100 covered with wire-wrap sockets, anyone?).
On Mon, 28 Feb 2022 17:23:52 +0000, Ahem A Rivet's Shot
<steveo@eircom.net> declaimed the following:
The Newbrain was first prototyped on double eurocard wire-wrap
boards, I got very slick with a wire-wrap gun on that job.
<envy> All I had (and should have in a box of chips somewhere)
was the double-ended (wrap/unwrap) "pencil".
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