Thanks to Bruce Mardle I now have 2 MC68012. I have designed a low-cost pc board for it and started a homepage. https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:mb012fully expect it will run OK at 12MHz. The existing Tiny68K software, including CP/M68K should run just fine on MB012.
It is a 4"x4" 2-layer pc board with 2 I/O expansion slots. The design is based on Tiny68K and since the large 64-pin DIP is replaced with a compact PGA, the space freed up is filled with two I/O expansion slots. The MC68012 is rated at 10MHz, but I
Bill
Le 22/02/2020 à 05:10, a écrit :fully expect it will run OK at 12MHz. The existing Tiny68K software, including CP/M68K should run just fine on MB012.
Thanks to Bruce Mardle I now have 2 MC68012. I have designed a low-cost pc board for it and started a homepage. https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:mb012
It is a 4"x4" 2-layer pc board with 2 I/O expansion slots. The design is based on Tiny68K and since the large 64-pin DIP is replaced with a compact PGA, the space freed up is filled with two I/O expansion slots. The MC68012 is rated at 10MHz, but I
Bill
Hi Bill,
That's good news! Keep us informed.
I also have MC68012 from Bruce.
If anyone needs MC68000P12F (68000 16Mhz DIP64), I have some available.
Marc
--
The 68K Documentation http://marc.retronik.fr/motorola/68K
Received the pc board a few days ago and populate one board. It seems to run fine. CP/M68K is up and running. It passes memory diagnostic. I need to do more test, but this is very promising. Look at the picture of the assembled board here: https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:mb012
On Thursday, 5 March 2020 02:55:46 UTC, coinst...@gmail.com wrote://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:mb012
Received the pc board a few days ago and populate one board. It seems to run fine. CP/M68K is up and running. It passes memory diagnostic. I need to do more test, but this is very promising. Look at the picture of the assembled board here: https:
Looks great! Did you solder the CPLD on by hand?Bruce,
On Friday, March 6, 2020 at 6:33:33 AM UTC-7, Bruce Mardle wrote:it should run. The 2nd board will have all the surface mount components populated and CPLD programmed. You'll need to provide the remaining parts.
Looks great! Did you solder the CPLD on by hand?Bruce,
Yes, the CPLD is hand soldered.
I'm waiting on 68010 PGA sockets that I'll modify slightly to accommodate 68012. Once I have the design in reasonable shape (in a week or two), I'll send you two boards, one is fully populated (but without 68012) so you can just plug in your 68012 and
Bill
Nice board!
Next with 2 GB of RAM?
Received the pc board a few days ago and populate one board. It seems to run fine. CP/M68K is up and running. It passes memory diagnostic. I need to do more test, but this is very promising. Look at the picture of the assembled board here: https://www.retrobrewcomputers.org/doku.php?id=builderpages:plasmo:mb012
Bill
On Friday, 6 March 2020 19:43:58 UTC, Marc J. wrote:
Nice board!
Next with 2 GB of RAM?
:-)
As Bill pointed out, a processor running at a humble 10MHz would take a long time to process 2GB of anything.
(At 10MHz, with 4 clock cycles per word, that works out to a minimum a little over 7 minutes.)
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