Circuitbenders Forum
Circuitbenders Forum => Parts, Components, Unbent machines & Junk => 'Offload Your Shit' => Topic started by: selfpreservation on June 22, 2011, 12:32:50 PM
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I NEED 24 of these
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what on earth for? Are you messing around with ancient computers or something?
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powertran ddl 8)
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Rework it to use a more modern static RAM. Forget 2114s, they are unmitigated shite. Not convinced?
Okay.
Even when they were new, they were expensive. The six 2114L chips for the RAM in the Commodore VIC 20 were approximately half of the cost of *all* the silicon in the damn things. They were way more than half the current draw, since each chip draws about 200mA each.
I have an Acorn Atom which is fully loaded with 12K of 2114s (24 of the bastards). It draws fully 6A from a regulated 5V supply, since the internal regulators can't hack the pace with all those memory chips. Very nearly 5A of that is just down to the memory!
The MTBF was - when new - about fifteen minutes, until you finally picked out a good set. The primary failure mode was to go dead short across the power pins, burning the power tracks off the board in a big expensive smelly cloud of obscenity and fail.
Do yourself a favour. Make a board with a couple of 6264s on it.
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id love to know how to expand the ram on the powertran apparently it can be modified to 6 seconds !!! but i havent a clue how to do it cant find any info, it can take up to 32 2114ls to give 1.6 secs but if these could be somehow replaced with a couple of larger easy to find cheaper chips that would be ideal