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Thread: SDS Z80 Starter Kit. Zbug ROM

  1. #1

    Default SDS Z80 Starter Kit. Zbug ROM

    I have just acquired SDS Z80 Starter.
    And I'm in the need for the Zbug Monitor ROM.

    Would anyone have a copy of this in hex format.?

    Regards
    Vernon

  2. #2

    Default

    Vernon,
    Google find two sites that may be exactly what you are looking for.

    http://www.kswichit.com/68k/68k.html
    https://hackaday.io/project/6150-bec...nguage-monitor

    That should get you started.

    Larry

  3. #3

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    Quote Originally Posted by ldkraemer View Post
    Vernon,
    Google find two sites that may be exactly what you are looking for.

    http://www.kswichit.com/68k/68k.html
    https://hackaday.io/project/6150-bec...nguage-monitor

    That should get you started.

    Larry
    Unfortunately it looks like neither of those have anything to do with the Z80 - they're both 68K-based efforts.

  4. #4

    Default

    Vernon,
    OOPS, I didn't see the Z80 information.

    Maybe this info will help.
    http://www.vcfed.org/forum/showthrea...stem-restorers

    and then Scroll down to MONITORS FOR Z80:

    http://www.nj7p.info/Computers/Software/Mon.html

    Larry

  5. #5

    Default

    Thanks guys. Some good links and info there.
    I managed to make an adapter to read the 8316 ROM as a 2716. And compared it to the source code and they seem the same.
    So I might have another problem with the Z80 Starter Kit.

    Vernon

  6. #6

    Default

    Vernon,
    A good place to start looking for problems is:
    1. VERIFY +5 VDC Power Supply on Pin 11
    2. Z80 CPU Clock Signal on Pin 6
    3. The following Z80 CPU Control Signals (Inputs to Z80) need to be HIGH
    Pin 16 = *INT
    Pin 17 = *NMI
    Pin 24 = *WAIT
    Pin 25 = *BUSRQ
    Pin 26 = *RESET
    (All the above Control Signals are Active LOW which is denoted by the * or / or BAR over Signal.)

    If these are all good (HIGH), then locate a know good Z80 CPU and bend all D0 thru D7 Pins out a bit
    so they won't go into the Z80 IC Socket, Then Jumper all D0 thru D7 Pins to GND, Pin 29.
    Insert the Z80 into the Motherboard, and check each and every Address Line to make sure it is
    being toggled HIGH, then LOW, and none is stuck LOW, or HIGH, or at .7VDC.
    That will check ~80% of the Motherboard. Don't forget that if the Address Lines go through Buffer IC's,
    that you need to check the Buffer Inputs, and then the Buffer Outputs. What remains will just be the
    Data Lines, Data Buffers, ROM, RAM, and Video RAM.

    Larry
    Last edited by ldkraemer; December 8th, 2017 at 05:23 AM. Reason: typo

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