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- Path: rzstud1.rz.uni-karlsruhe.de!uj3w
- From: uj3w@rzstud1.rz.uni-karlsruhe.de (Martin Gierich)
- Newsgroups: comp.sys.amiga.programmer,comp.sys.amiga.hardware
- Subject: Chunky <-> Planar conversion hardware
- Date: 19 Apr 1996 15:17:56 GMT
- Organization: University of Karlsruhe, Germany
- Message-ID: <4l8ar4$dfi@nz12.rz.uni-karlsruhe.de>
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-
- More and more games (and other programs) need to convert chunky gfx data
- to planar gfx data for displaying it on ECS or AGA. Using a little bit
- hardware, this could be done significantly faster.
-
- My idea is to use 8 serial TTL (or high speed CMOS) chips with parallel
- input/output capabilities to do this. You push 8 bytes chunky data in and
- then pull 8 bytes planar data out. The same way you can store 8 planar
- bytes in and get 8 chunky bytes out without additional hardware.
-
- Except for some wiring you just need the 8 standard TTL chips which are
- quite cheap. The only problem is: How can you get it into the Amiga,
- especially the A1200 ?
-
- Using a Zorro slot you can use some kind of memory mapping without auto-
- configuring and a software hack, which adds it to expansion.library,
- but the A1200 does not have a Zorro slot. :-(
-
- And the parallel port is a bad choice, because it is intended for the
- printer and it is quite slow.
-
- If people are interested, I post the schematics or put them on Aminet.
-
- PS.: This hardware is not compatible to the one supported by
- graphics.library, but is it more flexible (can do conversions in
- both directions) and cheaper and it should not be a problem to
- patch graphics.library to make use of it.
-
- --
- /\/\ o o
- / __ \ artin <
- (_/ \_) `---' uj3w@rz.uni-karlsruhe.de (Martin Gierich)
-