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Thread: MicroPDP-11 - some questions

  1. #71

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    Still no luck figuring this out. Does anybody have any idea what's going on here? I kind of suspect the OEM bootstrap theory, and I'm up for getting a couple EEPROMs and trying it with a known-good set, but the 11/73 firmware images on Bitsavers are 2x16KB, and according to the manual the MXV11 only supports up to 2x8KB...
    Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
    Synthesizers: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, E-mu Proteus/2, Moog Satellite, Oberheim SEM
    "'Legacy code' often differs from its suggested alternative by actually working and scaling." - Bjarne Stroustrup

  2. #72
    Join Date
    Aug 2012
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    California
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    Quote Originally Posted by commodorejohn View Post
    Still no luck figuring this out. Does anybody have any idea what's going on here? I kind of suspect the OEM bootstrap theory, and I'm up for getting a couple EEPROMs and trying it with a known-good set, but the 11/73 firmware images on Bitsavers are 2x16KB, and according to the manual the MXV11 only supports up to 2x8KB...
    Looks like you change the ROM size with jumpers on it:

    prom size J50-J51 J49-J51
    none
    2K x 8 R R factory default
    4K x 8 R I
    8K x 8 I I used with MXV11-B boot roms *
    J20-J21 specifies 2K user UVROMS (2716) directly addressed
    J20-J19 specifies 4K or 8K ROM directly addressed.
    Note J21 is a +5V post

    Caution to use the MXV11-B diagnostic boot rom set the
    jumpers noted with * must be selected (J-15-J17,J50-J51,
    and J49-J51) as well as the boot mode option of J44-J45

  3. #73

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    Yes, but there's no setting for 16K x 8 ROMs, which is what these are. Unless that's not the MXV11-B ROM?
    Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
    Synthesizers: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, E-mu Proteus/2, Moog Satellite, Oberheim SEM
    "'Legacy code' often differs from its suggested alternative by actually working and scaling." - Bjarne Stroustrup

  4. #74
    Join Date
    Aug 2012
    Location
    California
    Posts
    140

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    Ya those can't be right but, I found them for you. I can't post urls so, I'll PM the address to you

  5. #75
    Join Date
    Dec 2010
    Location
    Seattle, WA
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    The 16KB images are for the KDJ11-B M8190 11/73.

    For the MXV11-B you use the 8KB images.

    http://www.dunnington.u-net.com/public/DECROMs/ROMlist
    http://www.dunnington.u-net.com/public/DECROMs

  6. #76

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    Thanks so much. I'll give those a try as soon as I get my hands on a couple suitable EEPROMs.
    Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
    Synthesizers: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, E-mu Proteus/2, Moog Satellite, Oberheim SEM
    "'Legacy code' often differs from its suggested alternative by actually working and scaling." - Bjarne Stroustrup

  7. #77
    Join Date
    Dec 2010
    Location
    Seattle, WA
    Posts
    1,758

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    You can get 68766 EPROMs for $8 each at http://www.unicornelectronics.com but there is also a minimum order amount, maybe $25.

    You can sometimes find better deals for them on eBay. I don't see any listed currently. I have a handful myself which I got on eBay a while back.

  8. #78

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    Unicorn Electronics is great except for that order minimum. But I'd rather go with EEPROMs anyway as I don't have a UV eraser; I got a couple from Jameco, so hopefully I'll be able to get this figured out by next weekend.
    Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
    Synthesizers: Roland JX-10/SH-09/MT-32/D-50, Yamaha DX7-II/V50/TX7/TG33/FB-01, Korg MS-20 Mini/ARP Odyssey/DW-8000/X5DR, Ensoniq SQ-80, E-mu Proteus/2, Moog Satellite, Oberheim SEM
    "'Legacy code' often differs from its suggested alternative by actually working and scaling." - Bjarne Stroustrup

  9. #79
    Join Date
    Dec 2010
    Location
    Seattle, WA
    Posts
    1,758

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    Is there an 8KB EEPROM part with the correct pinout for the MXV11-B?

    I wasn't aware of any suitable reprogrammable 8KB parts other than the MC68766.

    Opps. I was thinking of the 24-pin sockets on the M8189 KDF11-B 11/23-Plus, where I have used 8KB MC68766 parts.

    I just looked at my MXV11-B and I do have a pair of much more common 28-pin 8KB EPROM parts installed.
    Last edited by gslick; September 28th, 2012 at 02:23 PM.

  10. #80
    Join Date
    Mar 2008
    Location
    Westchester County, NY
    Posts
    1,225

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    Gents,

    Check this out: http://www.vintage-computer.com/vcfo...achmentid=2719

    You'll see how I got around not having 68766s when I wanted to upgrade an 11/23+.

    Lou

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