GVP Simm<->72Pin Simm
Ben Scarboro
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Hi Ya All,
I believe that there was a thread about making an adaptor for 72 pin simms to
be used in a GVP accc.
Did anything ever become of this ??? If so did it work ???
What was the cost ??
If you've got the circuit digs, any chance you could e-mail them to:
Ben.Sc...@p3.f40.n254.z2.fidonet.org
Thanks for ya Time
... XExtEdTag : And remember kids, DON'T try this at home!
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Carl Mueller
Ben Scarboro <b...@woodybbs.netkonect.co.uk> wrote:
>I believe that there was a thread about making an adaptor for 72 pin simms to
>be used in a GVP accc.
>
>Did anything ever become of this ??? If so did it work ???
>
>What was the cost ??
>
>If you've got the circuit digs, any chance you could e-mail them to:
>Ben.Sc...@p3.f40.n254.z2.fidonet.org
I've seen nothing come up yet.
In fact, I took a look at the various pinouts just now and it seems
that such an adapter may not be feasible. The problems are:
1. The GVP SIMM has seperate WE (write enable) for each byte
on the 32-bit SIMM.
The 72-pin SIMM has only a single WE.
Are the seperate WEs actually used seperately on the GVP?
2. The GVP SIMM has a pin labeled "_G01234567". I'm guessing
this is an output-enable.
The 72-pin SIMM has no output-enable.
3. On the GVP SIMM, The RAS and CAS lines are interleaved in a
funny way, especially with respect to the WE lines. I don't
really know what the deal is with these.
The GVP SIMM info I used was posted here a while back.
The 72-pin SIMM info I used was from the PC HW FAQ and from
various places on IBM's website, including:
http://www.chips.ibm.com/products/memory/72simm/72simm.html
Sigh.
-Carl (mue...@cs.unc.edu)
DAN B HUPY
GVP simms: I have been told that the MAC IIfx (cant remember the model)
also use these 64 pin simms and should work just fine.
Another untested therory....
Du...@trader.com
I Love My AMIGA !!!
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Carl Mueller
DU...@trader.com (DAN B HUPY) writes:
>GVP simms: I have been told that the MAC IIfx (cant remember the model)
>also use these 64 pin simms and should work just fine.
>
>Another untested therory....
I'm pretty sure you've heard incorrect information.
While the Mac IIfx does use 64-pin SIMMs, they must be installed
in that Mac in sets of 4. This would seem to indicate that they
are only 8-bits wide, not 32.
The only Mac-type SIMM that may have a chance of being adapted
to the GVP board is the SIMM for the Mac 8*24 GC card. While
the connections are in the wrong place, the right set of connections
appears to be present. Please refer to:
http://dev.info.apple.com/technotes/Archive/Hardware/hw_555.html
and
http://www.kdcol.com/~val/amiga/hw/GVP-SIMMs.html
for more info. Of course, I have no idea where you can find
even these SIMMs, much less how much they might cost.
-Carl (mue...@cs.unc.edu)
Nigel Shearman
Gentlemen,
There was an article in AmigaNews a french magazine as to how to convert
a 72pin
simm to make it work on a GVP board. This was in the March or April
edition. I
have the exact magazine at home now. The modifications that were
described were
not for the faint hearted. I personally decided that it was dodgy cuting
smt chip
legs and then trying to solder to them.
Cheers Nigel
--
===============================================================================
N. J. Shearman
Senior Software Engineer
Lucent Technologies UK
Swindon Road, Malmesbury
Wiltshire, England SN16 9NA ext 2779
email nshe...@mltsa.mlm.att.com Tel +44 1666 832779
"Run like the wind,
As excitement shivers up and down my spine"
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Mathias Thorell
DAN B HUPY wrote:
>
> GVP simms: I have been told that the MAC IIfx (cant remember the model)
> also use these 64 pin simms and should work just fine.
>
> Another untested therory....
>
Well, I tried to use two 70ns 72-pin SIMMS from the MAX IIfx a while
ago.
It didn't work, but my GVP Combo 030/40MHz card really needs 60ns SIMMS,
not 70 ns.
The GVP RamTest program did cope with the first 1-2 megs though, after
that it always chrashed the machine...
I don't know if this means that some of the chips did actually work
at my processor's speed, or is there a serious "byte-mixup" problem
on the way ?
No Apple dealer im my area can get hold of the 60 ns version of the
SIMMS because they're not produced anymore (that's what I'm told,
anyway).
/MT
Hardware:
Amiga A2000C
GVP 030/882/40MHz
4 Mb 32-bit/2 Mb 16-bit/1 Mb Chip
160 Mb SCSI-II Hd (30 Mb Mac formatted)
Picasso-II/2Mb
Internal HD floppy/External DD floppy
Software (at least some of it) :
AmigaDOS 3.1 (SoftKicked from KS 2.04)
ShapeShifter 3.3, registered user
MUI 3.3, registered user
------------------------------------------------------------------------
Mathias Thorell Voice: +46 13 18 15 37
Flight Test Leader Fax: +46 13 18 42 83
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Flight and Systems Test Department ma...@limes.air.saab.se
Travis
In article <319829...@weald.air.saab.se>, Mathias Thorell
<ma...@weald.air.saab.se> wrote:
> Well, I tried to use two 70ns 72-pin SIMMS from the MAX IIfx a while
> ago.
> It didn't work, but my GVP Combo 030/40MHz card really needs 60ns SIMMS,
> not 70 ns.
A service tech remarked(to me) that memory chips for the PS/2 were
physically similar, but DID NOT know if they were electically compatible.
Anyone even know how to find out? Is there some master IC guide that could
compare those two types of RAM?
Stephane PEROLINI
Kal...@AzStarnet.com (Travis) wrote:
AST use 64 pin SIMMS in there computer and I send some to the man who
do the article in the Amiga New (French Magazin). I am waiting his
answer because he has the material to test the pin out of the SIMMS.
Bye
Stephane Perolini