At 2003-02-26 07:10 -0800, Joe wrote: >At 02:38 AM 2/26/03 -0800, Jaap wrote: >>At 2003-02-25 17:18 -0800, Joe wrote: >>>Can anyone tell me what this is? It's a 16 pin SSI IC and it's date coded 8327. My >>>guess is that it's an early 64k x 1 DRAM. Google didn't get any hits and chip >>>directory keeps popping up a "404 Not Found" error. >> >>The Intel 2101 was an 1K*1 SRAM,
Correction: The 2101 was an 256*4 SRAM, the 2102 was an 1K*1 SRAM. My TRS-80 had 2102's and not 2101's. > so the 2164 is probably >>a 64K*1 SRAM. > >Except that the intel 2104, 2107 and 2116 are all DRAMs (4k, 4k and 16k respectively). And the 2115, 2125, 2141, 2147 are xk*1 SRAM's. But I should have looked more carefully. Apparently Intel called all it's memory 21xx. >AFIK Intel never made any "big" DRAMs. You can read about this in one of prof. Andrew Grove's (ex-CEO of Intel) book. He describes that at a certain time (probably around 1985) they felt that they were a memory-company, but their processors (which started as a side-product) were very succesful and they couldn't compete against the Japanese memory makers, so they stopped making memory and started focussing on processors. >>'20' probably means that it's access time is 200 ns. >> >>Around 1983 seems right for this type of density. >>My Tandy/RadioShack TRS-80 of 1978/79 used 6 of >>the 2101's as video screen memory. (We had to add >>an extra one ourselves to get lower case characters. Correction: That 6 should have been 7. The SRAM for bit 5 (which distinguishes between upper and lower case characters) was missing, but bit 7 was present to be able to generate graphics. The graphics also only used 6 bits, each character consisted of a 2 by 3 array of rectangles that could be either on or off. The screen was only 64 characters by 16 lines (but much nicer than most of the other computers that had 40 by 24) and therefore the 'hi-res' was only 128 by 48. 128 was nice enough for those days, but the 48 was really too little. >That's interesting. Which model TRS-80? I was looking for some 2101s a while back >but couldn't find any. It was a TRS-80 Model I. Have you tried: http://www.chipdir.org/js/reqchip.htm Greetings, Jaap -- Author: Jaap van Ganswijk INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
