From: utzoo!decvax!ucbvax!ARPAVAX:C70:info-cpm Newsgroups: fa.info-cpm Title: Re: Memory Test Article-I.D.: ucb.1942 Posted: Tue Sep 14 03:06:59 1982 Received: Fri Sep 17 02:09:01 1982 >From tj@Okc-Unix Tue Sep 14 03:06:44 1982 memory test for what??? 8080? z80? 8085? different processors put different constraints on their dynamic rams. my system is a z80 and when I upgraded my 2 Mhz cpu to 4 Mhz, my "memory test" (supplied in my monitor provided my SD Systems) said that my memory Worked Perfectly. But for some reason, My system would no longer boot. It might sometimes do a partial boot before croaking or once in a while, it might even get to the cpm login message before dying. Came to find out later, after several fistfuls of hair, that the instruct fetch and data fetch cycles for a z80 were not the same length. instruction fetches were faster (beats me why) so while normal memory tests might work, the placing of accual code in that memory and then jumping to it might not. so, now ask, what kind of memory test do ya want now? tj