28 March 2008, 18:24 | #1 |
Registered User
Join Date: Mar 2008
Location: Waterlooville, UK
Posts: 68
|
GVP 64 pin RAM
So... I've recently (re)bought myself and A1200 and have tricked it up. I am very pleased with it, and also Bloodwych's Workbench installer . I've picked up a GVP 1230+ accelerator with with an 030 onboard running at 40MHz. I wanted something that would take 72 pin SIMMs and had an RTC, but got sick of waiting for one to turn up on FleaBay and go for silly money. I've been trawling the InterWebNetDotCom for some GVP style RAM but I have found absolutely none...... My questions to you wise people are therefore:
1) Will RAM made for a Mac IIFX (also 64 pin) slot into the board and work OK? 2) Does anybody make a 64 to 72 pin SIMM adapter so I can use more common RAM? 3) Why the hell did GVP decide on a rare RAM configuration anyway? TIA |
28 March 2008, 18:30 | #2 |
hastala vista winny vista
|
1)No
2)you have to make one yourself 3)to be able to sell them at stupid prices without competition from cheap imitators ? |
12 April 2008, 23:50 | #3 |
Registered User
Join Date: Mar 2008
Location: Waterlooville, UK
Posts: 68
|
Thanks for the reply. I just got back from being away. Are you sure that the 64-pin Mac RAM does not work....? I mean.... the chips will have been made by a third party and will therefore be some "standard" voltage, so why wouldn't a 64-pin Mac SIMM work? Has anybody tried it?
|
13 April 2008, 06:33 | #4 |
hastala vista winny vista
|
I tried it. It doesn't work because probably pinout is completely different. There's no standard on 64 pin SIMMs, so GVP and apple adopting the same pinout would be a really small probability anyway.
|
13 April 2008, 13:56 | #5 |
Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
|
@Skote
I looked into building a Adapter board, but the memory controllers for both type are differnet, so its not just differently arranged signals, there are different signals to boot. The linkie Coze has provided, is the only realy method at the moment for said hackery, infact i was going to make and Adapter board that went from gvp64 to standard 72pin edo/fpm there were a few of problems
I even thought well hey, just build a controller for the missing circuit, but GVP have what can only be considered archaic in memory controll so yes,.... get hacking.... |
13 April 2008, 16:00 | #6 |
hastala vista winny vista
|
I think instead of an adapter board, building the GVP 64pin SIMM board PCB would be more trouble free. You'ld then need to desolder chips on a 16 mb SIMM and solder on the new board.
Of course this would require lots of time and money, cause you probably wouldn't get the PCB in the right form factor in the first prototypes ... |
13 April 2008, 17:05 | #7 |
Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
|
@Coze
would you have a proper pinout for the GVP 8MB sticks ? or some nice hi-res photo's back and front ? |
13 April 2008, 17:30 | #8 |
hastala vista winny vista
|
I have some pinouts I made myself but they're a mess (and you may already have them ) Also, there are no 8mb GVP sticks. They only come in flavours of 4 and 16. Almost all GVP stuff I had had jumpers to set 4 and 16 mb sticks, so you can't mix-match them and there's no auto recognition, so it shouldn't be too complex really. Also the GVP hack at Aminet is only re-routing of signals (no logic involved) so it should be possible. There was only one issue of OE or something to be solved, and the guy had to connect it to Parity line or something, can't remember right now ...
|
22 April 2008, 20:43 | #9 |
Registered User
Join Date: Mar 2008
Location: Waterlooville, UK
Posts: 68
|
Softhut are selling 4MB SIMMS at the moment.....
|
22 April 2008, 21:26 | #10 |
Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
|
dare i ask how much, and if they actually respond LOL.
|
23 April 2008, 05:37 | #11 |
I hate potatos and shirts
|
A leg and an internal organ, I dare to bet.
The problem on the aminet hack is only the special SIMM socket (lacks in any serious PCB program). But I think it is only a matter of making a 4-layer mini-board and solder (yes, solder!) the regular 72-pin SIMM on it to achieve a nice GVP SIMM "emulator"... |
29 April 2008, 19:34 | #12 |
Registered User
Join Date: Mar 2008
Location: Waterlooville, UK
Posts: 68
|
Well... I got a single 4MB SIMM for £21 including delivery from Softhut this morning. It took one week after I paid with PayPal for it to arrive. It was well packed and I've been offered a $5 discount off a future purchase. Now I have a whopping 8MB of FastRAM. Je suis le Papa? Of course I would have liked to get a pair of 16MB SIMMs, but they guy said he couldn't get me any, and in any case I suspect they would have been mega money. A good experience I reckon.
|
29 April 2008, 20:46 | #13 |
Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
|
well played Skote,
i am truly pleased for you! alas i have never had any luck with Software Hut... ..... so Skote...... whats your lottery numbers |
29 April 2008, 23:26 | #14 |
Registered User
Join Date: Mar 2008
Location: Waterlooville, UK
Posts: 68
|
Um.. it's the same as my PIN... 1,2,3,4,......
|
29 April 2008, 23:58 | #15 |
Ya' like it Retr0?
Join Date: Jul 2005
Location: United Kingdom
Age: 49
Posts: 9,768
|
|
04 May 2008, 16:13 | #16 |
Registered User
Join Date: Mar 2008
Location: Waterlooville, UK
Posts: 68
|
I have noticed something now that I have 10MB in total on the 1200. The boot time is MUCH reduced. Is this because the Kickstart is now being loaded into FastRAM when I boot? The reason I ask is that there is a command to do this in my startup sequence and I used to get an error message saying that there wasn't enough RAM when I only had 6MB...? |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Wanted: GVP Simm32 64 pin 4mb modules | k4lmp | MarketPlace | 0 | 07 November 2012 21:48 |
GVP 1230 64 pin ram required | mjnurney | MarketPlace | 2 | 24 February 2011 09:57 |
SWAP - GVP 64 pin RAM 4Mb module for... | Loedown | Swapshop | 7 | 18 April 2009 22:46 |
Wanted: GVP 64 pin ram | AmigaOasis | MarketPlace | 3 | 05 March 2007 01:31 |
128 MB RAM SIMM 72-PIN - FPM RAM - 66 MHz - 5V - 60ns - Parity | Effy | MarketPlace | 8 | 29 April 2005 17:21 |
|
|