kent@lloyd.camex.uucp (Kent Borg) (09/13/88)
Does somebody out there know the pinout of a Mac compatible SIMM? Thanks. Kent Borg kent@lloyd.uucp or hscfvax!lloyd!kent
edc@aeras.UUCP (news guest account) (09/14/88)
In article <190@lloyd.camex.uucp> kent@lloyd.camex.uucp (Kent Borg) writes: >Does somebody out there know the pinout of a Mac compatible SIMM? > >Thanks. > >Kent Borg >kent@lloyd.uucp >or >hscfvax!lloyd!kent Please post the responses! I wanna kludge me some cheap memory too!! -edc-
kent@lloyd.camex.uucp (Kent Borg) (09/16/88)
In article <274@aeras.UUCP> edc@aeras.UUCP (news guest account) writes: >In article <190@lloyd.camex.uucp> kent@lloyd.camex.uucp (Kent Borg) writes: >>Does somebody out there know the pinout of a Mac compatible SIMM? > >Please post the responses! I wanna kludge me some cheap memory too!! >-edc- Turns out the answer was from in-house. From a Toshiba data book, page A-191 the THM91000S/L-10/12, 1M bit x 1 bit: (Looking down on component side of the SIMM, connector on the left.) VCC 1 *CAS 2 DQ0 3 A0 4 A1 5 DQ1 6 A2 7 A3 8 VSS 9 DQ2 10 A4 11 A5 12 DQ3 13 A6 14 A7 15 DQ4 16 A8 17 A9 18 N.C. 19 DQ5 20 *W 21 VSS 22 DQ6 23 N.C. 24 DQ7 25 Q8 (DQ8??) 26 *RAS 27 *CAS8 28 D8 29 VCC 30 Good luck! Kent Borg kent@lloyd.uucp or hscfvax!lloyd!kent
ching@pepsi.amd.com (Mike Ching) (03/29/89)
I am trying to make a memory expansion board using SIMMs but can't find the pin definition of the 30 pin connector. I suppose I could buy the module and ohm it out but prices seem to be dropping and I'd prefer to delay the purchase until I've built the motherboard. Any help would be appreciated. Thanks in advance, Mike Ching ching@lassen.AMD.COM
spraggs@ve7apu.UUCP ( VE7ADE) (03/30/89)
This is the pinout for a 1 Meg SIMM. I have shown the assignments for a 9 bit part for completeness. The ninth chip is missing on a Mac SIMM so these (*) are NC as well. A 256k part is NC on A9. I expect a 4 Meg part puts A10 on pin 19 and a 16 Meg one has A11 on pin 24. X ___ X Vcc CAS DQ1 A0 A1 DQ2 A2 A3 Vss DQ3 A4 A5 DQ4 A6 A7 .. continued in line X 1 15 X X _ ___ ___ X .. DQ5 A8 A9 NC DQ6 W Vss DQ7 NC DQ8 Q9 RAS CAS9 D9 Vcc X 16 * * * 30 Vcc = +5V Vss = ground DQ = Data I/O A = Address ___ ___ CAS = Column Address Strobe RAS = Row Address Strobe Since the Mac + at least does not pull down D9 or CAS9, by 9 SIMMs should not be used since these inputs can float through the mid voltage region. When this happens excessive current flows, causing over heating and possibly enough noise to corrupt data. John Spraggs