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- Path: EU.net!sun4nl!xs4all!hell!mario
- Date: Mon, 15 Jan 96 23:08:45 GMT+1
- Newsgroups: comp.sys.amiga.hardware
- Distribution: world
- Subject: Re: gvp 64 pin memory, anybody got a p
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- From: mario@hell.xs4all.nl (Mario Rhynsburger)
- Message-ID: <mario.0d7a@hell.xs4all.nl>
- Organization: -=The Hell BBS=- Call: +31-70-3468783
-
- In a message of 13 Jan 96 Gene Heskett wrote to All:
-
- GH> Help! I have a gvp accelerator card for an A1200 here on my service
- GH> bench.
-
- GH> It won't recognize a perfectly good 4 meg 64 pin GVP sim in either
- GH> socket.
-
- GH> Running the program "addmem" as a memory tester, it gets to random
- GH> places,
- GH> kicks out a bad memory at $xxxxxxxx error and exits. The quitting point
- GH> is
- GH> of course on a 4 byte boundary cause thats the granularity of a 32 bit
- GH> stick of memory. It also errors when the msnibble of the last byte is
- GH> 8+
- GH> about 90% of the time. It may find the error in the first 500 bytes, or
- GH> may
- GH> trundle thru nearly the full 4 megs before finding it. The one time I
- GH> got
- GH> it to add 1/2 meg of it, the machine was instantly frozen and had to be
- GH> rebooted.
-
-
- Here are the pinouts of the famous 64 pin GVP simms:
- I have drawn from A 1Meg simm, but the changes on 4Meg
- simms are clear (just the A9 pin). Whether the RAM chips
- are static column or whatever, I don't know. The pinouts
- of the RAM chips are standard. A PCB of at least 4 layers
- is recommended.
-
- Pin# Pin#
- 1 GND 33 GND
- 2 | 34 _CAS46
- 3 | 35 _CAS57
- 4 | 36 _RAS0246
- 5 |D0-7 37 _RAS1357
- 6 | 38 NC
- 7 | 39 NC
- 8 | 40 _W23
- 9 | 41 _W45
- 10 VCC 42 |
- 11 A0 43 |
- 12 A1 44 |
- 13 A2 45 |D16-D23
- 14 A3 46 |
- 15 A4 47 |
- 16 A5 48 |
- 17 A6 49 |
- 18 A7 50 VCC
- 19 A8 51 |
- 20 A9 (4Mb) 52 |
- 21 | 53 |
- 22 | 54 |D24-D31
- 23 | 55 |
- 24 |D8-D15 56 |
- 25 | 57 |
- 26 | 58 |
- 27 | 59 _W67
- 28 | 60 GND
- 29 _W01 61 connect to pin 62
- 30 _CAS02 62 connect to pin 61
- 31 _CAs13 63 _G01234567
- 32 VCC 64 GND
-
- The indexes behind _W, _G, _CAS and _RAS show wich RAM chip to connect to.
- There are 8 chips either 4x1Mbit or 4X4Mbit, with index 0-7. Index 0 is for
- datapins 0-3, 1 for datapins 4-7 and so on... Remember the order of the
- datapins 0-7, 8-15, 16-23 and 24-31 can be mixed in refrence to the number
- on the RAM chips. I hope anybody can make cheaper SIMMS from now on... Maybe
- someone can make an adapter for 72 pins?
-
- -Morten Leikvoll / leikvoll@hsr.no (Is it short enough?)
-
- -------------------------------->B---------------
-
- c^&u
-
-
- Mario Rhynsburger
- -- Via Xenolink 1.981, XenolinkUUCP 1.1
-