29 October 2019, 17:58 | #1 |
Bane of Magic
Join Date: Nov 2005
Location: Bradford, UK
Age: 38
Posts: 335
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A500(plus) memory expansion
Been doing some fiddling with my 500 lately and trying to find more info on the RAM expansion, but found no info on BBoAH or anywhere else.
The label (second image) reads as such - "1/2 & 1 Meg A500 Plus EXPANSION" "(c) DJ For CORTEX DESIGN & TECHNOLOGY LTD" Anyone seen one of these before and know anything about them? |
29 October 2019, 18:43 | #2 |
ex. demoscener "Bigmama"
Join Date: Jun 2012
Location: Fyn / Denmark
Posts: 1,624
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I don't know anything about this specifically, but my bet is, it's a 512kB slow expansion for A500/1MB chip expansion for A500+.
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29 October 2019, 18:43 | #3 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,861
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That looks the bare minimum 1MB trapdoor expansion for the A500+.
Were you interested in knowing something about the company who made this or what? The schematics for these were printed in the back of the A500 and A500+ user's guide, so it was not very difficult for lots of companies to make different kinds of 512k and 1M RAM expansions. |
29 October 2019, 19:48 | #4 |
Registered User
Join Date: Mar 2004
Location: finland
Posts: 1,837
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Cortex was pretty popular here early 90s, my A500 has a ½Meg Cortex in it.
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29 October 2019, 20:46 | #5 | |
Bane of Magic
Join Date: Nov 2005
Location: Bradford, UK
Age: 38
Posts: 335
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Quote:
Knowing more is always a nice thing, though. All the pictures I've seen generally show much larger boards that do basically the exact same thing as this one. |
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29 October 2019, 21:38 | #6 |
Registered User
Join Date: Dec 2016
Location: East Kilbride, Scotland
Posts: 451
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8 x 51C4256 chips makes it a 1Mb RAM expansion. Pretty bare bones card, just the 8 RAM chips and associated decoupling caps
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