rbo@bs2001.informatik.uni-dortmund.de (Ralf Bormann) (01/24/91)
My boss asked me whether it is possible to upgrade the memory in our 4/390 to more than 56 MB. Our current configuration is 32 MB, i.e. 8 MB on the CPU-board and 24 MB on a separate memory board. Some time ago, we upgraded some 4/330's by replacing the 8 1-MB simms of the CPU-board by 8 4-MB simms. Additionally, we had to set the 4-MB-simm jumper. Up to now we haven't had any problems with that configuration. Though the CPU-boards of the 4/330 and the 4/390 are identical, the situation for the 4/390 is a little bit more complicated (at least for me) because of the separate memory board. This board consists of 6 banks, each one for 8 1-MB-simms. And there is a jumper called "4 Meg". I have two questions: 1. Is it possible to replace the 1-MB-simms of the CPU-board by 4-MB-simms? 2. Ditto for the memory board. Ralf Bormann e-mail : rbo@unido.uucp University of Dortmund, IRB ..uunet!unido!rbo P.O.Box 500500 BITNET : rbo@ddoinf6.bitnet D-4600 Dortmund 50, West Germany voice : +49 231 7552747
labman@ecr.mu.oz.au (Bruce Robertson) (01/29/91)
In article <1444@brchh104.bnr.ca>, rbo@bs2001.informatik.uni-dortmund.de (Ralf Bormann) writes: > 1. Is it possible to replace the 1-MB-simms of the CPU-board by > 4-MB-simms? Yep it is OK all you need do is exactly what you did for the 4/330 - the second memory board will auto relocate it starting address to the first hard LOC after the CPU onboard 32Meg. > 2. Ditto for the memory board. I have not done this at all. All information I have says that the board was designed to support 4Meg SIMMS so give it a go by. First putting the 4Meg simms into the memory expansion board and see if the boot code in the eeprom sizes the memory correctly If so get some more 4Megs for the CPU. Regards, Bruce Robertson | labman@gondwana.ecr.mu.OZ.AU Department of Engineering Computer Resources, | labman@128.250.1.63 C/o Faculty of Engineering, | Besides; It's not the Principle University of Melbourne, 3052. AUSTRALIA | of the thing, it's the money.