elliot@alfred.UUCP (Elliot Dierksen) (11/13/89)
I have a 3B1 (used to be a 7300 before I hacked it to bits!!) that currently has 3.5MB of RAM. I have a 512K RAM card & a 1MB Combo card currently installed. My question is: If I fully populate the Combo card, am I going to be able to get to that 4MB point or is that 512K that I add just going to step on the 512K card. I thought I had heard something about being able to path the cards so they would run correctly. If it's not possible, please let me know. I would hate to have a 512K paperweight and still only 3.5MB. Any assistance/comments is greatly appreciated.. Thanx, EBD -- Elliot Dierksen Home: {peora,ucf-cs,uunet}!tarpit!alfred!elliot Work: {att,codas}!candi!ralph!ebd "What's another word for Thesaurus??" -- Steven Wright
flinton@eagle.wesleyan.edu (11/14/89)
In article <553@alfred.UUCP>, elliot@alfred.UUCP (Elliot Dierksen) writes: > I have a 3B1 (used to be a 7300 before I hacked it to bits!!) that currently > has 3.5MB of RAM. I have a 512K RAM card & a 1MB Combo card currently > installed. My question is: If I fully populate the Combo card, am I going to > be able to get to that 4MB point or is that 512K that I add just going to > step on the 512K card. I thought I had heard something about being able to > path the cards so they would run correctly. > > If it's not possible, please let me know. I would hate to have a 512K > paperweight and still only 3.5MB. Any assistance/comments is greatly > appreciated.. Thanx, In the First Edition (November 1986) of the "S/50 Reference Manual" -- aka the UNIX(r) PC Reference Manual -- page 7 of Appendix C (Expansion Memory Locations) clearly suggests that the _only_ way to achieve 4.0 Meg is with 2.0 Meg on the CPU board and a fully populated 2.0 Meg RAM card in any slot. If someone knows a hardware mod with which to overcome this -- or better still a hardware mod to utilize all 24 RAM address lines (instead of the 22 actually used -- see above-mentioned Ref. Man. Chapter 2 pages 2-2 and 2-3) -- there'll surely be wide interest in seeing such info posted. -- fejlinton