riiali@kannel.lut.fi (Pekka Riiali) (07/18/90)
I have a Tandon XT with 4.77 MHz 8088 processor. I'd like to know if it is possible to change the processor to 8 MHz NEC V20. Half of the memory chips are 64-15RS and the other half are 256-12. I guess that there will be some problems with the slow memory. Any kind of help is appreciated. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + internet: riiali@kannel.lut.fi ++ Pekka Riiali + + irc: beke ++ Karikatu 11 + + The evil that men do lives on and on..++ SF-48910 KOTKA FINLAND + +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
d89os@efd.lth.se ((Mr)) (07/18/90)
In article <2330@kannel.lut.fi> riiali@kannel.lut.fi (Pekka Riiali) writes: >I have a Tandon XT with 4.77 MHz 8088 processor. I'd like to know >if it is possible to change the processor to 8 MHz NEC V20. Half of >the memory chips are 64-15RS and the other half are 256-12. I guess >that there will be some problems with the slow memory. >Any kind of help is appreciated. Yes, I believe it's ok to change the processor. However, the crystal for the clock generator is o u t s i d e the processor. This means that if you pull out the 8088 and put the V20 in you will have a V20 running at 4.77 MHz. The V20 will still be faster than the 8088 though. (Due to a number of boring technical details.) There will be no problem with the memory. If you want to run the V20 at 8 MHz you'll have to change the crystal also. In this case there might be a memory problem, but as I haven't got any information about the chip access times I cannot answer your question.
wdarden@nrtc.nrtc.northrop.com (Bill Darden <wdarden>) (07/19/90)
In article <2330@kannel.lut.fi> riiali@kannel.lut.fi (Pekka Riiali) writes: > >I have a Tandon XT with 4.77 MHz 8088 processor. I'd like to know >if it is possible to change the processor to 8 MHz NEC V20. Half of >the memory chips are 64-15RS and the other half are 256-12. I guess >that there will be some problems with the slow memory. >Any kind of help is appreciated. Your problem will not be the speed of the memory chips. You will need to provide a second oscillator circuit into the 8284 and control the switching of it. The other problem *might* be the speed of the other chips. It will be cheaper to buy an 8 MHz XT mother board, since you already have your DRAM. Good luck, BiLL.....