Date   : Tue, 14 Sep 1982 00:47:32 EST (Tuesday)
From   : Cal Thixton <tj@Okc-Unix>
Subject: Re: Memory Test

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