22 May 2023, 21:28 | #1 |
Q
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AST 4MB 64-Pin SIMM for GVP
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22 May 2023, 22:45 | #2 |
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No - the pinout for GVP 64-pin SIMMs are unique.
Also, GVP 4MB SIMM32's are all 60ns, and IIRC uses a more rare 4K-type refresh part. Last edited by thebajaguy; 22 May 2023 at 22:51. |
23 May 2023, 07:08 | #3 |
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If you need GVP Simms, you can usually buy freshly made simms on Amibay. Worked fine for me.
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23 May 2023, 14:25 | #4 | |
0ld0r Git
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Quote:
I wasn't aware GVP or any SIMM for that matter could go "Stale". You're probably watching too much of the "Travel Show" on BBC1. Last edited by Kin Hell; 23 May 2023 at 14:32. |
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24 May 2023, 07:56 | #5 |
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24 May 2023, 11:10 | #6 | |
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Quote:
https://www.ebay.com/itm/334471303537 |
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24 May 2023, 15:23 | #7 | |
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As is mentioned previously, GVP branded Zorro expansions and other products had a specific requirement for GVP style simms only. I have a GVP TBC+ in my A3000 with such simms giving 8mb Z2 ram. I bought them on eBay listed as GVP 4mb simms. |
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24 May 2023, 16:30 | #8 | |
ex. demoscener "Bigmama"
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Quote:
Why one of the ram chips in the photo of the linked SIMM is different from the others, I don't know, they are all 1Mx4 DRAMs. If the SIMM supports FPM (almost all do), all the ram chips supports this, there is no separate chip for the FPM support. Last edited by hooverphonique; 24 May 2023 at 16:36. |
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25 May 2023, 19:08 | #9 |
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Motorola chose to ignore the use of the parity bit. That's the reason for the x8 or x32 -bit nature of SIMMs used by the Amiga.
During the late 1980's/early 1990's, 8-bit/9-bit memory on 30-pin SIMMs was the standard. 32-bit memory standards had yet to be established. PC/Intel chose to use the parity bit, so there is always an extra bit, so x9 or x36 (and what became the 72-pin SIMM standard through the 'EDO' period). Later server memories went one further (ECC), and wit that, could repair one bit, and detect a second, in an 8-bit grouping. Desktops eventually dumped the parity bit detection. FWIW - You don't really want to know what goes on inside modern DDR3/DDR4 server memory today, which now has a form of self-healing properties/spares. There has been an intermittent eBay seller from the UK which makes and sells the cloned GVP SIM32's. That's your best option. |
27 May 2023, 08:39 | #10 |
0ld0r Git
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tbtorro designed some "fresh" GVP SIMM's a while back.
https://eab.abime.net/showthread.php...p+simms&page=2 https://www.amibay.com/threads/4mb-6...erators.94046/ Might be worth a P.M. at least. |
29 May 2023, 00:17 | #11 | |
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29 May 2023, 04:08 | #12 | |
0ld0r Git
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