pako@neuronstar.it.lut.fi (Pasi Koikkalainen) (05/07/90)
SIMMS for Sun4/110 Have anyone upgraded memory for Sun 4/110 ? Our factory configuration was 8Mb with 256 Kb SIMMS and we wanted to upgrade it to 20 Mb using 1Mb SIMMS. We used same type of 1 Mb SIMM:s that we have been using for Sun 3/60 but it seems that the ones for Sun 4/110 are something else. Can anyone inform us what type of SIMMs are correct? The printing on Sun 4/110 SIMMs was NMBS MM2800J95-08 and the chips were AAA2800J-08 NMBJ8804 and I was not able to find them in any of my data books (that are 2-3 years old). Buying SIMMS from Sun would we waste of money: they are 3-6 times more expensive. Impatiently waiting for your advices, Pasi Koikkalainen Lappeeranta Univ. of. Tech. Information Tech. Lab. P.O.Box 20, 53851 Lappeenranta, Finland koikkalainen@ltkka.lut.fi or pako@neuronstar.it.lut.fi
pako@neuronstar.it.lut.fi (Pasi Koikkalainen) (07/16/90)
SIMMS FOR SUN4/110 (Summay at last...) _______________________________________ This is a summary of answers for my inquery that was posted a log time ago. I sorry that it took so long to reply (we spent some time to find out what was the real problem and I have been travelling a lot lately). My original question was: >Have anyone upgraded memory for Sun4/110 ? >Our factory configuration was 8Mb with 256 Kb SIMMS >and we wanted to upgrade it to 20 Mb using 1Mb SIMMS. >We used same type of 1 Mb SIMM:s that we have been using >for Sun 3/60 but it seems that the ones for sun4/110 >are something else. I got many (wrong) answers, thank you anyway.... Most answers suggested that the difference between sun 3/60 and 4/110 SIMMs is 100ns vs. 80ns timing. In fact sun 4/100 works well with 100ns RAMs also and you can mix 100ns and 80ns SIMMs. (We have now 4MB 80ns and 16 MB 100ns SIMMs). The real difference was pointed out by Ken Schmitt (Acropolis Systems, Inc): >Some of the SIMMs that Sun shipped with the 3/60s can be used for >the Sun-4/110; others cannot be used. Sun-4/110 requires 80 nsec. >Static Column DRAM (SCRAM) SIMMs. However, it also works with >80 nsec. Page Mode DRAMs as well (most of Sun-3/60s were shipped >out with 100 nsec. Page Mode DRAMs though). Sun-4/110 do not work >with "regular" (old type) and nibble-mode DRAMs. 80ns is not the requirement but "Static Column DRAM (SCRAM)" is. We have now Toshiba TC511002P/J-10 (Static Column 100ns 1MB DRAM) and it works ok. Compatible RAMs are for example TMX4C1027 (TI), HM511002 (HITACHI), uPD421002C/LA (NEC). I will not include a price list of different suppliers since the ones I have are good only in Finland (I know there are BIG differences, especially in USA and in Japan). Pasi Koikkalainen Lappeenranta Univ. of Tech. Information Tech. Laboratory P.O.Box 20, 53851 LPR Finland e-mail: koikkalainen@ltkka.lut.fi (more secure) or pako@neuronstar.it.lut.fi By the way, some old documentation about memory jumpers in sun 4/110 was wrong too.