piclist 2017\09\26\065008a >
Thread: Lost Souls
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face BY : mike brown email (remove spam text)


That's a cool piece of trivia reminiscent of the PIC list days of lore.
Alas, it uses a pair of 256x4 2101 chips.  You should check out what kids
today are doing.  They are building emulators and copies in FPGAs of the
old Elf.  I was astounded to see that there were people doing such things.

They still use 1801 processors for satellite/space usage.  Apparently they
have a natural resistance to radiation in the gold and ceramic packages.

The CDP1861 video generator is now truly as rare as proverbial hens teeth,
but I think someone is making a pin compatible copy using a small CPLD.

http://cosmacelf.com

On Sep 26, 2017 01:15, "RussellMc" <apptechnz@spam@spamgmail.com> wrote:

​Probably 5101 low power CMOS memory.
(256 x 4 from memory).

If loaded regularly with the same code these started to "remember" their
prior contents when powered off overnight and then restarted.
This could not be relied on as "ROM: but seemed to become more ROM like
with time.
- This was discovered by some students who had a system that ran the same
code which was rekeyed in each day. (Why it was not just left on I know
not).

Russell
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