EDO RAM question

[oldpx]

My 1200 came with a blizzard 1230 IV board with 16 mb edo ram. It has single ram slot and I had to replace the existing one with a 32 mb edo. I bought an IBM 32mb 60ns ram but it does not work. Amiga simply doesn't boot, just displays a black screen. I can return it anytime but I'm discouraged to buy another one at the moment :p

Here are the numbers written on the ram. I'm alien to most of this stuff and some parts are unreadable:

32 Mb 60 NS (8MX40) 5.0V E
118 33G0728 530323002
FRU39H8312 806 VIM UO 33G0822

Do I have a wrong type of ram or do I need to tweak my expansion card somehow? :confused

[RetroMan]

Is this a single or a double sided module ?? Some double sided modules refuse to work on a blizzard ! But anyway, which Blizzard Card you got ? Some of them don´t have auto configure for RAM so you may have to change Jumper settings for matching you new amount of Ram !

[oldpx]

There are chips on the both sides of the ram but old 16 one is double sided as well (which works).

This (http://www.amiga-hardware.com/blizzard1230iv.html) is my board.

[jmmijo]

@Burseg and Retroman, note that this module appears to be a 5vdc one, SIMM's can come in 3.3vdc types as well. Not sure if the card supports only one type or not, but you should check this as well. Normally a 3.3v type will work in a 5v card but will eventually give out due to having the extra voltage applied to it, this is not however the case when you reverse this, so sticking a 5v type into a SIMM slot that only supports 3.3v will usually not work as there is not enought voltage applied to the SIMM.

EDIT: one other note, perhaps this board doesn't like EDO memory, only FPM type. The info in your link only mentions autoconfig and up to 128MB of ram. Yes you can get SIMM's that go all the way up to 256MB now.

[RetroMan]

Hmmm, the 1230-IV got self configured memory ! Try disabling the MAPRom feature, maybe it helps ! I got a 1230-II here and with 8 MB the MapRom feature works kewl, with 40 MB attached, it won´t work at all (Black Screen) ..... Do you have any 486 or Pentium Board to test the Edo Ram ?

[oldpx]

No I don't have any way to test it but I'm nearly sure it works.
How do I disable the feature? I don't have any documents about the board at all.

jimmijo's idea makes sense but it's early to give up ;)

[oldpx]

Ah I found the jumper let me play with it...

[jmmijo]

Something else I just remembered, there are a lot of buffered type of SIMM's out there, some memory interfaces support this and some do not. This is something else to check out!

[RetroMan]

Originally posted by jmmijo
EDIT: one other note, perhaps this board doesn't like EDO memory, only FPM type. The info in your link only mentions autoconfig and up to 128MB of ram. Yes you can get SIMM's that go all the way up to 256MB now.
Nope, these Boards are designed to work with EDO, not Fast Page ;)

[oldpx]

No luck. Jumpers don't effect anything. I'm open to suggestions. Should I give up?

[oldpx]

It's better to return it and test before getting another one. Anyway thanks for all the info, I'll remember to check the jumpers if other modules don't work in the future.

[jmmijo]

Do you have any other SIMM's to try out? Here in the states these kinds of memory modules are dirt cheap, not sure about Turkey however.

[oldpx]

Yes they are quite cheap it's not a matter but 32mb modules are rare.

[oldpx]

Found a working one that also works when maprom is enabled :D :D :D

[oldpx]

WRONG! I don't believe this. It is not recognized as 32mb but 4Mb !!!!! :kill :kill :kill

[jmmijo]

There seems to be something that is causing some timing issues with the SIMM's and the accelerator. This is most likely the cause of the problems. Seems that perhaps only a select few will work with your board :(

I've seen this happen with PC's too so don't feel like it's the Blizzard board.

[oldpx]

I tried another one and it works. At last :) Thanks a lot to you all :)