pgn@osupyr.mast.ohio-state.edu (Paul G. Nevai) (11/02/88)
HELP!!! HELP!!! HELP!!!
I screwed it up! I had 4 256 Kbyte Ram chips for a MacPlus and
4 256 Kbyte Ram chis for a Mac II. But I kept them in the same
place and now I can't tell them apart. Can you tell me which one
is which?
Set #1 says:
-12 TIH8817C9SN
TMS 4256FMC Singapore E
TM4256HU8
-12L 8817 SNK N4V0
Set #2 says:
MH25608J -15
Japan 63410T
M5M4256J
63235A -15
Would the real Mac II RAM please step forward?
Please Email answer! 10^6 thanks!
Paul Nevai pgn@osupyr.mast.ohio-state.edu
Department of Mathematics TS1171@OHSTVMA.bitnet
The Ohio State University 73057,172.Compu$erve
231 West Eighteenth Avenue 1-614-292-5310.office
Columbus, OH 43210, U.S.A. 1-614-292-4975.deptfriedman@porthos.rutgers.edu (Gadi ) (11/03/88)
In article <1014@osupyr.mast.ohio-state.edu> pgn@osupyr.mast.ohio-state.edu (Paul G. Nevai) writes: > Set #1 says: > > -12 TIH8817C9SN > TMS 4256FMC Singapore E > TM4256HU8 > -12L 8817 SNK N4V0 Mac II. The 12 stands for 120ns access time, required for the Mac II. > > Set #2 says: > > MH25608J -15 > Japan 63410T > M5M4256J > 63235A -15 > Mac SE. The 15 stands for 150ns access time, which is enough for the MacSE Gadi -- uucp: {ames, cbosgd, harvard, moss}!rutgers!aramis.rutgers.edu!friedman arpa: FRIEDMAN@ARAMIS.RUTGERS.EDU
nghiem@ut-emx.UUCP (Alex Nghiem) (11/03/88)
In article <1014@osupyr.mast.ohio-state.edu>, pgn@osupyr.mast.ohio-state.edu (Paul G. Nevai) writes: > Set #1 says: > > -12 TIH8817C9SN > TMS 4256FMC Singapore E > TM4256HU8 > -12L 8817 SNK N4V0 > > Set #2 says: > > MH25608J -15 > Japan 63410T > M5M4256J > 63235A -15 Note that set 2 is has a marking of "15." Set 1 has a marking of "12" These markings mean the speed of the chip. 12 stands for 120 nanoseconds. The Mac II needs these chips because of it's higher microprocessor speed. 15 stands for 150 nanoseconds. Most microcomputer systems use 15 nanosecond chips. 150 nanoseconds is appropriate for the Mac +, Mac SE, etc..