granteri@pnet51.orb.mn.org (Grant Erickson) (09/24/89)
After a long run down of the Macintosh IIci and the Macintosh Portable and the Minnesota Macintosh Users Group meeting, I was enlightend to the fact that in the IIci you must use 80 nanosecond F)ull P)age M)ode SIMMs. These must be used to take advantage of the burst-mode of the 68030. My question is, will these cost more than current SIMMs and how much more will they be? Please respond to both the net and E-Mail if possible. Grant Erickson ._________________________________________________________. | UUCP: {rosevax, crash, orator}!orbit!pnet51!granteri | | ARPA: crash!orbit!pnet51!granteri@nosc.mil | | INET: granteri@pnet51.cts.com | |---------------------------------------------------------| | The right half of the brain controls the left half | | of the body. This means that only left-handed people | | are in their right mind. | !_________________________________________________________!
jeff@ndcheg.cheg.nd.edu (Jeffrey C. Kantor) (09/25/89)
In article <1149@orbit.UUCP>, granteri@pnet51.orb.mn.org (Grant Erickson) writes: > After a long run down of the Macintosh IIci and the Macintosh Portable and the > Minnesota Macintosh Users Group meeting, I was enlightend to the fact that in > the IIci you must use 80 nanosecond F)ull P)age M)ode SIMMs. These must be > used to take advantage of the burst-mode of the 68030. > > [stuff deleted] What is a F)ull P)age M)ode SIMM? I know what the 80ns bit is all about, but what does the FPM bit mean? More to the point, if I order 80ns SIMMs from the usual list of SIMM vendors, will they work in a MacIIci? -- Jeff Kantor US Mail: Dept. of Chemical Engineering internet: jeff@ndcheg.cheg.nd.edu University of Notre Dame uucp: iuvax!ndmath!ndcheg!jeff Notre Dame, IN 46556 USA
granteri@pnet51.orb.mn.org (Grant Erickson) (09/25/89)
jeff@ndcheg.cheg.nd.edu (Jeffrey C. Kantor) writes: >In article <1149@orbit.UUCP>, granteri@pnet51.orb.mn.org (Grant Erickson) writes: >> After a long run down of the Macintosh IIci and the Macintosh Portable and the >> Minnesota Macintosh Users Group meeting, I was enlightend to the fact that in >> the IIci you must use 80 nanosecond F)ull P)age M)ode SIMMs. These must be >> used to take advantage of the burst-mode of the 68030. >> >> [stuff deleted] > >What is a F)ull P)age M)ode SIMM? I know what the 80ns bit is all about, >but what does the FPM bit mean? > >More to the point, if I order 80ns SIMMs from the usual list of SIMM vendors, >will they work in a MacIIci? > > >-- >Jeff Kantor > US Mail: Dept. of Chemical Engineering >internet: jeff@ndcheg.cheg.nd.edu University of Notre Dame > uucp: iuvax!ndmath!ndcheg!jeff Notre Dame, IN 46556 USA Well as Paul Pashibin of Apple Corporate in Bloomington, MN explained it as being this. Lets say you have a data word. The 68030 grabs the first 1/4 in 5 cycles, the 2nd 1/4 in 5 cycles, the 3rd 1/4 in 5 cycles, and the final 1/4 in 5 cycles. This ends up taking 20 cycles consequently. So with the FPM SIMMs together with the 68030's burst mode, it reads 1st: 5 Cycles and the next consecutive 3 in 2 Cycles each. There for you have a total of 11 Cycles compared to 20 giving you a 181% speed increase in that situation. I myslef do not know if people like Chip Merchant will have these at the current low $89 price for NORMAL 80Ns SIMMs. Disclaimer: I have no affiliation with Apple nor Chip Merchant or anyother company that you might want to dream up. Grant Erickson ._________________________________________________________. | UUCP: {rosevax, crash, orator}!orbit!pnet51!granteri | | ARPA: crash!orbit!pnet51!granteri@nosc.mil | | INET: granteri@pnet51.cts.com | |---------------------------------------------------------| | The right half of the brain controls the left half | | of the body. This means that only left-handed people | | are in their right mind. | !_________________________________________________________!
mdj@apple.com (Michael D. Johnson) (09/25/89)
In article <781@ndcheg.cheg.nd.edu> jeff@ndcheg.cheg.nd.edu (Jeffrey C. Kantor) writes: > What is a F)ull P)age M)ode SIMM? I know what the 80ns bit is all about, > but what does the FPM bit mean? FPM stands for *Fast* Page Mode not Full Page Mode. Page Mode RAM allows the RAS line to be held down while the CAS line is used to pulse bits out quickly. ----------------------- Just remember; I said it, Apple didn't.
hodas@eniac.seas.upenn.edu (Josh Hodas) (09/26/89)
In article <1150@orbit.UUCP> granteri@pnet51.orb.mn.org (Grant Erickson) writes >jeff@ndcheg.cheg.nd.edu (Jeffrey C. Kantor) writes: >>In art <1149@orbit.UUCP>, granteri@pnet51.orb.mn.org (Grant Erickson) writes: >>> ... I was enlightend to the fact that in >>> the IIci you must use 80 nanosecond F)ull P)age M)ode SIMMs. These must be >>> used to take advantage of the burst-mode of the 68030. >>> [stuff deleted] >> >>What is a F)ull P)age M)ode SIMM? I know what the 80ns bit is all about, >>but what does the FPM bit mean? >>More to the point, if I order 80ns SIMMs from the usual list of SIMM vendors, >>will they work in a MacIIci? >Well as Paul Pashibin of Apple Corporate in Bloomington, MN explained it as >being this. Lets say you have a data word. The 68030 grabs the first 1/4 in 5 >cycles, the 2nd 1/4 in 5 cycles, the 3rd 1/4 in 5 cycles, and the final 1/4 in >5 cycles. This ends up taking 20 cycles consequently. So with the FPM SIMMs >together with the 68030's burst mode, it reads 1st: 5 Cycles and the next >consecutive 3 in 2 Cycles each. There for you have a total of 11 Cycles >compared to 20 giving you a 181% speed increase in that situation. I myslef do >not know if people like Chip Merchant will have these at the current low $89 >price for NORMAL 80Ns SIMMs. > >Grant Erickson Well, I called Chip Merchant this afternoon and the woman on the phone claimed that their Samsung 80ns SIMMS are FPM. I do not know how one could confirm this though. If I post a chip # from the simm, does someone have a Samsung part list to look it up on. Speed was always an easy thing to identify from the -xx number, but I have no idea what identifies an FPM chip. Josh ------------------------- Josh Hodas (hodas@eniac.seas.upenn.edu) 4223 Pine Street Philadelphia, PA 19104 (215) 222-7112 (home) (215) 898-5423 (school office)