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17 September 2015, 18:24
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#141 |
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Posts: n/a
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Hi, anyone considered possibility of adding more than 2MB RAM? Might be configured as fast...
Got a bunch of GM71C18163BJ6 chips 1024kx16 They have additional pair of pins, which include 9th Address line. That is clearly available, so I'm going to give it a shot. but... there are 2 RAS lines - so total 4MB could be theoretically used. Am I right? AFAIR it would require super agnus or so to use that as chip. Last edited by stachu; 17 September 2015 at 18:31. |
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18 September 2015, 13:28
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#142 |
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Posts: n/a
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...or does 2MB itself require using 2 separate chips (or set of chips) and therefore both RAS signals?
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18 September 2015, 14:52
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#143 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,861
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The Agnus will only address 2MB of chip RAM.
You could potentially use it as ranger fast at $c00000. Time to study the A500 service manuals and think about how you would assert _RAMEN to get it visible. |
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25 September 2015, 17:33
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#144 |
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Posts: n/a
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Yeah, that's not the issue here. I could just use single chip to get 2MB chipmem, but is it going to work, since there are 2 RAS lines?
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