Hi there,
I saw many kind of MOSTEK ram chips like 4027N-1 or 4027N-3 or 4096-11... I think the last digit is the speed. Does someone know if they all work on the ALLPE 1, due to his low working speed?
Thank you,
Gabriele
Hi there,
I saw many kind of MOSTEK ram chips like 4027N-1 or 4027N-3 or 4096-11... I think the last digit is the speed. Does someone know if they all work on the ALLPE 1, due to his low working speed?
Thank you,
Gabriele
Please support the defense of Ukraine.
Credit card, bank transfer
Bitcoin, Ethereum, Polkadot, USDT
via Unclutter App for Mac
No Ads.
No Trackers.
No Social Media.
All Content Locally Hosted.
40 Gigabytes and Growing.
Built on Free Software.
This page, the entire Applefritter site, and all subsites of are copyright 1999-2999 by Tom Owad unless otherwise noted. All rights reserved. Apple, the Apple logo, Macintosh, Mac, MacOS, MacBook, iMac, and Mac Pro are trademarks of Apple Computer, Inc. LEGO®is a trademark of the LEGO Group of companies which does not sponsor, authorize or endorse this site (the feeling's mutual).
I also found some TMS-4027-30 or ITT 4027-6J memories... will they work?
Hello asbesto,
not all extensions clearly indicate the speed.... common endings like -1 or -2 or -3 do so.
-1 is = 100 nS, -2 = 200 nS and -3 = 300 nS.
usualy you should use for the apple1 rebuild the Mostek MK4096 which is also indicated by the circuitplan of the apple 1
( see apple 1 manual ) and the common used chips were -2 or 200 nanoseconds... -3 probably are to slow and can cause errors by to slow timing.... ROMs have other timing and therefor may be slower --- up to maximum of 350 nanoseconds...
sincerely speedyG
Most original units were populated with MOSTEK 4096-11. Those are the slowest of the MOSTEK chips of that era - 350ns access time and 500 ns cycle time and 320mW power consumption.
Faster parts may work, but be aware that they draw more power and there is marginal power distribution, especially to the DRAM on the Apple 1 motherboard. I vaguely remember someone telling me that they tried MK4027s and they worked.
Regards,
MIke Wilelgal