Hello all:
I am building up a Klyball Superboard 600 replica and have most parts for it on hand or ordered. I wasn't able to find a source for the 3.932160 MHz crystal. Unicorn Electronics has both 3.6864 Mhz and 4.000 Mhz, so I thought I would try those and see if they are close enough.
Any idea on the tolerance for the crystal? I imagine it depends on the monitor being used. A 4 MHz crystal will put the vertical refresh signal at around 61 Hz rather than 60 Hz, which is not too far off.
Another option could be to use a programmable oscillator chip like this one: https://www.digikey.com/products/en?key ... 2DC-PTB-ND
It is not a drop in replacement for a crystal but should work with some simple circuit modifications.
Regards,
Jeff
Source for 3.932160 MHz Crystal?
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- Posts: 62
- Joined: Thu Jul 18, 2013 11:24 am
- Location: Dorrigo, NSW , Australia
Re: Source for 3.932160 MHz Crystal?
Superboard II - RevD, 8Kb, DABUG monitor ROM.
C1P - RevD, 610, 2 drives, CEGMON.
FPGA C1P/C2/C4. 1-8MHz, 48Kb ram, CEGMON, 16KB Hires.
C1P - RevD, 610, 2 drives, CEGMON.
FPGA C1P/C2/C4. 1-8MHz, 48Kb ram, CEGMON, 16KB Hires.
- jefftranter
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- Joined: Sun Dec 29, 2019 7:32 pm
Re: Source for 3.932160 MHz Crystal?
That looks like a good option. Thanks!
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- jefftranter
- Posts: 15
- Joined: Sun Dec 29, 2019 7:32 pm
Re: Source for 3.932160 MHz Crystal?
Those are through-hole, so even better.
I'm starting to build up a 600 board and am putting some files, including a Bill of Materials, here:
https://github.com/jefftranter/6502/tre ... Superboard
I'm starting to build up a 600 board and am putting some files, including a Bill of Materials, here:
https://github.com/jefftranter/6502/tre ... Superboard