17 February 2014, 22:20 | #1 |
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Amiga 1200, Virtual Memory?
I have an Amiga 1200 & Apollo 1260 (32mb RAM)
As it is a desktop, I cannot fit another 32mb SIMM and I will not towerize it... As some demos and games (Quake II) require 64mb, I was wondering if virtual memory was a possibility? |
17 February 2014, 22:28 | #2 |
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not without using the MMU, which AmigaDOS doesn't.
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17 February 2014, 22:32 | #3 |
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17 February 2014, 22:40 | #6 |
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there's also GigaMem 3, look in EAB ftp.
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18 February 2014, 02:48 | #7 |
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I couldn't get them to work, oh well....
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18 February 2014, 05:28 | #8 |
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18 February 2014, 08:30 | #9 |
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18 February 2014, 09:41 | #10 | |
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Quote:
Can some wizard alter the bios to accept 64mb Simms? That would be ideal! (Probably not as it would have been done already) Last edited by Amicol; 18 February 2014 at 10:00. |
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18 February 2014, 11:01 | #11 | |
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Quote:
I'd have probably kept my Apollo 1260 if I'd know about that 64MB mod |
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18 February 2014, 19:27 | #12 |
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19 February 2014, 05:33 | #13 |
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19 February 2014, 10:53 | #14 |
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19 February 2014, 11:05 | #15 |
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I've seen that done. The only thing that bothers me is if the SIMM became faulty it would be an absolute nightmare to replace it. In fact it would possibly be easier to replace the faulty IC rather than the entire SIMM.
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19 February 2014, 11:14 | #16 |
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19 February 2014, 22:29 | #17 | |
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Quote:
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20 February 2014, 05:00 | #18 |
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Regarding the 32MB limit per SIMM, it seems to be a hardware limitation (e.g.: not enough address lines on PCB), which can’t be by-passed by means of a BIOS update. May be some other knowledgeable user can explain this better than me.
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20 February 2014, 10:54 | #19 |
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There was some time ago a bit of discussion about Apollo's memory:
http://eab.abime.net/showthread.php?t=72049 |
20 February 2014, 15:24 | #20 |
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@ShK: Thanks mate, that’s were I’ve read about such limitation.
A bit off-topic, but what about the BIOS? Has anybody ever tried to dissassembly it and document its contents? Could a stable 100MHz mode be achievable through proper optimization of its code? |
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