To EDO or not to EDO... this is the question!
 

Hi,

I have a lot of 72-pin SIMMs (2MB, 4MB, 8MB, 32MB, ...) and 30-pin SIMMs.

Many of the 72-pin ones are EDO. Will they work on Amiga accelerators? Or do they only accept non-EDO SIMMs ?

My Blizz 2060 and CSPPC have no probs with EDO.

As far as I heard, this works just fine!

I think they just ignore the EDO part.

Hmmm... AFAIK, years ago, PC's motherboards refused to accept EDO RAM if they were not designed to accept them. But I could be wrong, or it could be true for some motherboards and not for others.

060 accelerators could be "modern" enough to accept those RAM... and what about A1200 030/040 accelerators? Do they accept EDO RAM?

Works fine on an 030.
As Novacoder said, EDO is just ignored.

EDO ram sticks both on 2 accelerators, Apollo 1230/40, and Blizzard 1230/50, working perfect.

64 MB Edo on my Typhoon 030 @ 40.... no probs whatsoever.

Apollo 4060 does not like EDO SIMMs, it sometimes shows only half of capacity.
im using FPM (fast page mode) simms with 2k refresh where its possible

Warpengine works with EDO... (In case this gets picked up by google as the repository for using EDO Simms on amiga accelerators!)

Microbotics MX1230-XA works with EDO SIMM, too. I use to have a 128Mb SIMM stick in it. ;)

blizzard 1240, apollo 1240, Dkb cobra 030 and a dkb 2632 all running edo simms fine here.

Experience with a B1230IV, B2060, CSMK1, 2x CSMK2, CSPPC and never really looked what SIMM I plugged into them, always worked.

I have a mixture of EDO and FPM SIMMs in my box 'o RAM.

I tried the Blizzard 1230/IV with EDO and FPM SIMM, both worked with same performances. However I remember that the Amiga Format or Amiga User magazine reported a review about a 68030 board taking a little advantage on mounting the EDO SIMM. This was manufactured surely after Blizzard 1230/IV, perhaps in 1996 and probably not by Phase5.

A1200 XL, got about 10% speed advantage of using EDO.

Yes, with my old PC (AMD K6-2 400 - or was it 350? - overclocked to 450 MHz) I got a speed difference (with memory tests, not with normal programs) of about 19% between EDO and non-EDO RAM.

my Blizzard MKIII 030 takes both with no problems at all

I'm pretty sure I have EDO in my Apollo 4060, without problems, same for the 1240.
Has anyone ever managed to find the ED RAM which the 4040/60 apparently support? if so, is it noticably faster than FPM or EDO?

Probably the speed gain is not directly related with the EDO part.

EDO RAM came in 60 and 50ns "flavours", and that is the reason why the RAM expansion works faster.;)

You could also get fast page mode in 50ns...although it's hard to find now.

Normaly fast page was 70ns and edo was 60ns.