- Joined: 14 Aug 2000
- Posts: 742
- Location: Adelaide, Australia
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32Mbit development cart
 Posted: Tue Sep 26, 2000 9:51 am
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some people have been asking about dev carts in the forum, so i'm giving out my design.
it uses 3 commonly available 74HC series logic chips:
frames 0 and 1 are fixed to pages 0 and 1 of the ROM respectively, frame 2 is switchable. a memory write to $F000
(or higher) will cause a page. frame 2 is not initialised in any way.
there are 8 output lines, so 256 16kB pages are supported. alternatively with software control it will support multiple ROMS,
i.e. upto 3 4Mbit ROMs, 4 2Mbit ROMs, etc...
now i just have to wait for my homepage server to come online again!!!
disclaimer: design is untested and at the moment is just a design.
a s out
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