• Prime bitslice processor

    From Jim Wilcoxson@21:1/5 to All on Fri Apr 24 07:44:00 2020
    Is this the chip that Prime used to implement its CPUs?

    http://www.righto.com/2020/04/inside-am2901-amds-1970s-bit-slice.html

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  • From Dennis Boone@21:1/5 to All on Fri Apr 24 11:04:56 2020
    Is this the chip that Prime used to implement its CPUs? http://www.righto.com/2020/04/inside-am2901-amds-1970s-bit-slice.html

    The 2900 family was used in at least some of the designs.

    There's another common ALU, the 74181, which might be a candidate
    for the earliest machines.

    De

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  • From Bob Allison@21:1/5 to Jim Wilcoxson on Wed Oct 21 19:12:37 2020
    On Friday, April 24, 2020 at 10:44:01 AM UTC-4, Jim Wilcoxson wrote:
    Is this the chip that Prime used to implement its CPUs?

    http://www.righto.com/2020/04/inside-am2901-amds-1970s-bit-slice.html
    The 2901 bit slices were used in the early ecl machines but once we got to the 6000 series we were
    designing our own chips using Motorola MCA2500 ECL Macrocell Arrays on all the boards of the CPU.

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  • From Daiyu Hurst@21:1/5 to bobbya on Sat Jul 10 19:55:40 2021
    On Wednesday, October 21, 2020 at 10:12:38 PM UTC-4, bobbya wrote:
    On Friday, April 24, 2020 at 10:44:01 AM UTC-4, Jim Wilcoxson wrote:
    Is this the chip that Prime used to implement its CPUs?

    http://www.righto.com/2020/04/inside-am2901-amds-1970s-bit-slice.html
    The 2901 bit slices were used in the early ecl machines but once we got to the 6000 series we were
    designing our own chips using Motorola MCA2500 ECL Macrocell Arrays on all the boards of the CPU.

    Were the P300 and P400 ECL machines? I hadn't thought so. I have the P300 microcode manual, and we once had the microcode boards for the P400 at Greater Clark County Schools. I remember looking at them, and I'm pretty sure that's what I recall was used.

    On Friday, April 24, 2020 at 12:05:02 PM UTC-4, Dennis Boone wrote:
    Is this the chip that Prime used to implement its CPUs? http://www.righto.com/2020/04/inside-am2901-amds-1970s-bit-slice.html
    The 2900 family was used in at least some of the designs.

    There's another common ALU, the 74181, which might be a candidate
    for the earliest machines.

    I have the data sheets for the 54181/74181 ALU in my 1976 (second printing) Texas Instruments TTL Data Book. if they're not already online somewhere, let me know, I'll scan the pages.

    But I'm a stroked-out old lady; what do I know, lol.

    -Dai

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  • From Dennis Boone@21:1/5 to All on Sun Jul 11 20:24:33 2021
    Were the P300 and P400 ECL machines? I hadn't thought so. I have the
    P300 microcode manual, and we once had the microcode boards for the P400
    at Greater Clark County Schools. I remember looking at them, and I'm
    pretty sure that's what I recall was used.

    No, pretty sure the first ECL machine was the 9950.

    I have the data sheets for the 54181/74181 ALU in my 1976 (second
    printing) Texas Instruments TTL Data Book. if they're not already
    online somewhere, let me know, I'll scan the pages.

    Check http://bitsavers.org/components/ti/_dataBooks/ - I suspect
    it's in there.

    De

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  • From Daiyu Hurst@21:1/5 to Dennis Boone on Tue Jul 13 10:18:09 2021
    On Sunday, July 11, 2021 at 9:24:39 PM UTC-4, Dennis Boone wrote:
    Were the P300 and P400 ECL machines? I hadn't thought so. I have the
    P300 microcode manual, and we once had the microcode boards for the P400
    at Greater Clark County Schools. I remember looking at them, and I'm
    pretty sure that's what I recall was used.
    No, pretty sure the first ECL machine was the 9950.
    I have the data sheets for the 54181/74181 ALU in my 1976 (second
    printing) Texas Instruments TTL Data Book. if they're not already
    online somewhere, let me know, I'll scan the pages.
    Check http://bitsavers.org/components/ti/_dataBooks/ - I suspect
    it's in there.

    De

    Yup. Minus the faux-leather covers. Al seems not to favor the covers.

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  • From Dennis Boone@21:1/5 to All on Tue Jul 13 20:18:04 2021
    Yup. Minus the faux-leather covers. Al seems not to favor the covers.

    Given the volume he scans, if it won't go through the sheet feeder,
    I suspect they sometimes get skipped. :)

    De

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