• Early Micro based product

    From Vincent Coen@2:250/1 to All on Sun Feb 27 14:53:46 2022
    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.
    This around 1973 - 4 - sorry my memory is getting a bit dull these days and
    yes was involved with them and the very early 808, 6502, 68000 (hmm may be not that one) etc.

    Vincent

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  • From Ahem A Rivet's Shot@3:770/3 to Vincent Coen on Sun Feb 27 16:38:26 2022
    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.

    --
    Steve O'Hara-Smith
    Odds and Ends at http://www.sohara.org/

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  • From Vincent Coen@2:250/1 to Ahem A Rivet's Shot on Sun Feb 27 18:40:08 2022
    Hello Ahem!

    Sunday February 27 2022 16:38, you wrote to me:

    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.

    I was referring to the internals not the physical and I was told by Intel in the early 70's of some of the details but have not kept the document's - at least to my knowledge.

    I did play with a very early micro based board around that time and it consisted of multi 4004's and some other elements, seems to recall a small board say of less than a foot square, possibly a lot less - sorry to long ago and I had a lot of others systems to look after or was playing with.

    My first board was (going by my poor memory) a 6502 followed around the same time of a proto 8080 with a mind bending Ram size of 4K but I could connect it to a teletype 33 for I/O a later one had a link to a tape drive - that's a Philips device.

    About the same time as I had a PDP 8 and PDP 11 in my spare bedroom.
    [ Yes, hard work to get them up the stairs ]


    Vincent

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  • From Dennis Lee Bieber@3:770/3 to All on Sun Feb 27 14:43:36 2022
    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 generator, the
    said five 8212s, some memory chips -- 8x 2102 [1K by 1bit] static RAM, and
    1KB worth of UV ROM [1702 256 by 8bit, I recall]; I subsequently sourced an 8228 and some other memory chips... Never did finish the Wirewrap card for
    it -- nor test the "monitor" program I'd written to handle a calculator
    keypad and 2-digit LED display.).

    Two 8212s used to latch/buffer the 16 address lines.
    One 8212 used to latch/buffer the data OUT
    One 8212 used to latch the data IN
    One 8212 (as I recall) used to latch/buffer the control signals (after they'd gone through some AND/OR/etc. gates to combine things like "IO/MEM"
    & "RD/WR" -- Intel influenced chips support separate I/O "ports" rather
    than relying upon memory-mapped I/O as with 6800/6502 systems). The 8228
    took care of the bottom three 8212s, but did not handle the address lines.



    --
    Wulfraed Dennis Lee Bieber AF6VN
    wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/

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  • From Ahem A Rivet's Shot@3:770/3 to Dennis Lee Bieber on Sun Feb 27 20:10:02 2022
    On Sun, 27 Feb 2022 14:43:36 -0500
    Dennis Lee Bieber <wlfraed@ix.netcom.com> wrote:

    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 --

    Thank you, system controller not bus interface - it's been a while.

    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

    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.

    --
    Steve O'Hara-Smith
    Odds and Ends at http://www.sohara.org/

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  • From David Higton@3:770/3 to Ahem A Rivet's Shot on Sun Feb 27 22:30:46 2022
    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".

    David

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  • From TimS@3:770/3 to David Higton on Sun Feb 27 22:55:52 2022
    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.

    --
    Tim

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  • From Andy Leighton@3:770/3 to TimS on Mon Feb 28 03:41:28 2022
    On 27 Feb 2022 22:55:52 GMT, TimS <timstreater@greenbee.net> wrote:
    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.

    It depends what extra instructions.

    DJNZ and the JR family got tons of use.

    --
    Andy Leighton => andyl@azaal.plus.com
    "We demand rigidly defined areas of doubt and uncertainty!"
    - Douglas Adams

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  • From Dennis Lee Bieber@3:770/3 to All on Mon Feb 28 11:18:00 2022
    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. The two computers were kept in a narrow room which tended to overheat, so in summer/fall the covers were often slid back to let a fan blow into the
    boxes. They were used for (UCSD) Pascal, and for the OS course (can't risk letting us barbarians into the campus mainframe for that).

    The "evaluation kit" was just the reference manual, and a bunch of "cosmetic defect" chips in anti-static foam. A number of these were bought
    by the students in the digital electronics III course (at the time, CompSci
    was a MATH major, exposure to digital stuff was from the PHYSICS department <G>). 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?).


    --
    Wulfraed Dennis Lee Bieber AF6VN
    wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/

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  • From Dennis Lee Bieber@3:770/3 to All on Mon Feb 28 12:55:50 2022
    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".


    --
    Wulfraed Dennis Lee Bieber AF6VN
    wlfraed@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/

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  • From Ahem A Rivet's Shot@3:770/3 to Dennis Lee Bieber on Mon Feb 28 17:23:52 2022
    On Mon, 28 Feb 2022 11:18:01 -0500
    Dennis Lee Bieber <wlfraed@ix.netcom.com> wrote:

    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.

    Wow, but yeah controller boards often seemed to get odd chip
    choices that probably make good sense when you know the whole story.

    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?).

    The Newbrain was first prototyped on double eurocard wire-wrap
    boards, I got very slick with a wire-wrap gun on that job.

    --
    Steve O'Hara-Smith
    Odds and Ends at http://www.sohara.org/

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  • From Ahem A Rivet's Shot@3:770/3 to Dennis Lee Bieber on Mon Feb 28 19:33:50 2022
    On Mon, 28 Feb 2022 12:55:51 -0500
    Dennis Lee Bieber <wlfraed@ix.netcom.com> wrote:

    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".

    My own wire-wrap tool was one of those golden barreled things with
    a stripper (wire) in the middle. The Gardner-Denver tools Newbury labs
    sprung for were *expensive*, but pretty much essential if you're going to
    get a board built and tested in a day - along with endless tubes of
    pre-cut, pre-stripped wire in several lengths (a very exoensive

    --
    Steve O'Hara-Smith
    Odds and Ends at http://www.sohara.org/

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