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- Path: cs.duke.edu!cmueller
- From: cmueller@cs.duke.edu (Carl Mueller)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: gvp ram is it the same as pc ram?
- Date: 26 Feb 1996 19:57:45 GMT
- Organization: The University of North Carolina at Chapel Hill
- Message-ID: <4gt3bp$2pq@duke.cs.duke.edu>
- References: <4gs9oa$qcq@otis.netspace.net.au> <19960226.441290.EE45@ai038.du.pipex.com>
- NNTP-Posting-Host: romeo.cs.duke.edu
-
- Mathew Hendry <m.hendry@dial.pipex.com> wrote:
- >richard gormley (rgormley@netspace.net.au) wrote:
- >>I was wondering if the ram on the gvp boards is the same as pc ram? I
- >>know it is physicaly diferent but would it be possible to make a one
- >>to one converter for the gvp board (say hard wire a simm socket via
- >>wire wrap wire to a old ram module with the corect pitch?)
- >
- >Yes. I am unsure of the exact SIMM type needed, but it is possible to make an
- >adaptor. The main problem you will have is finding the pinouts (particularly
- >for the GVP RAM)...
-
- I've been wondering something similar. I've even been contemplating
- hardwiring a standard SIMM directly to the GVP board. Here's some
- info I've collected:
-
- ---------------------------------->B--------------------------
-
- From: Morten Leikvoll <leikvoll@hsr.no>
- Newsgroup: comp.sys.amiga.hardware
- Receive-Date: Freitag, 22-Apr-94 14:52:38
- Message-ID: 2o0s9f$8eq@marton.hsr.no
- Date: 7 Apr 1994 11:54:23 GMT
- Subject: -= HERE ARE THE GVP-SIMM PINOUTS!=-
- Organization: Rogaland University Centre
- UserFlags: ReadAccess
- GlobalFlags: Exported
-
- 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---------------
-
- From the IBM PC Hardware FAQ:
-
- 72 pin Fast Page Mode SIMM 256k/512k/1M/2M/4M/8M x 32/36 bit
- pin assignment|pin assignment|pin assignment|pin assignment
- 1 Gnd |19 A10 |37 MP1 |55 DQ11
- 2 DQ0 |20 DQ4 |38 MP3 |56 DQ27
- 3 DQ16 |21 DQ20 |39 Gnd |57 DQ12
- 4 DQ1 |22 DQ5 |40 -CAS0 |58 DQ28
- 5 DQ17 |23 DQ21 |41 -CAS2 |59 Vcc
- 6 DQ2 |24 DQ6 |42 -CAS3 |60 DQ29
- 7 DQ18 |25 DQ22 |43 -CAS1 |61 DQ13
- 8 DQ3 |26 DQ7 |44 -RAS0 |62 DQ30
- 9 DQ19 |27 DQ23 |45 -RAS1 |63 DQ14
- 10 Vcc |28 A7 |46 N/C |64 DQ31
- 11 N/C |29 N/C |47 -WE |65 DQ15
- 12 A0 |30 Vcc |48 N/C |66 N/C
- 13 A1 |31 A8 |49 DQ8 |67 PD1
- 14 A2 |32 A9 |50 DQ24 |68 PD2
- 15 A3 |33 -RAS3 |51 DQ9 |69 PD3
- 16 A4 |34 -RAS2 |52 DQ25 |70 PD4
- 17 A5 |35 MP2 |53 DQ10 |71 N/C
- 18 A6 |36 MP0 |54 DQ26 |72 Gnd
-
- Notes:
- MP0,MP1,MP2,MP3 are N/C on all x32 bit modules [MP = memory parity?]
- a9 is a N/C on 256k and 512k modules
- a10 is a N/C on 256k, 512k, 1M and 4M modules [4M should be 2M?]
- RAS1/RAS3 are N/C on 256k, 1M and 4M modules
-
- ----------------------------------------------------------------------
-
- So the question is what should connect to what?
-
- About those 72-pin SIMMs: I believe that 512k, 2M, 8M SIMMs are
- really just 2 banks of 256k, 1M, or 4M (hence the extra RAS lines).
-
- -Carl (mueller@cs.unc.edu)
-