As I said in the original post I wrote, sometimes you gotta use flash devices that are WAY faster than common EPROMs...
2015-09-07 12:32 GMT-03:00 John Robertson <j...@flippers.com>: > On 09/06/2015 2:00 PM, Alexandre Souza wrote: > >> Jay, no one is pin compatible, I always make adapters. But at least I make >> it work :D >> >> 2015-09-06 16:00 GMT-03:00 Jay West <jw...@classiccmp.org>: >> >> Alexander wrote... >>> ----- >>> Intersting to note: many times i have used eproms in place of these >>> proms. >>> Usually, flash parts are faster, so better suited to the task. >>> ----- >>> >>> Loader roms: >>> You may be able to get by with that on loader roms. I've never found >>> eproms that were functional & pin compatible. What ones did you use for >>> the >>> 1K variety? >>> >>> Microcode: >>> I doubt seriously the eproms would be stable for microcode. HP specs 5ns >>> speed parts for the microcode; what eproms work and can hit those >>> speeds? I >>> suspect this is one of those "might seem to work" but is a really bad >>> idea. >>> >>> J >>> >>> >>> >>> As Jay points out, it is the access speed required by the device you are > substituting the EPROM for a ROM/PROM that counts. In some cases the 100 to > 400ns access speed of EPROMs won't matter (clock of under 1mHz for 400ns > 2716s to around 4mHz for 100ns EPROMs), but if you are running 10mHz or > faster reads then I suspect you will have problems unless you find faster > devices than EPROMs for your substitute ROM/PROM... > > John :-#)# > > -- > John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 > Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) > www.flippers.com > "Old pinballers never die, they just flip out" > >
