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- Path: news.lut.fi!news
- From: petsalo@lut.fi (Jyrki Petsalo)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: AgaEXTENDER + diagrams in Aminet
- Date: 02 Apr 1996 12:34:32 +0300
- Organization: Lappeenranta University of Technology, Finland
- Sender: petsalo@boa.cc.lut.fi
- Message-ID: <wltu3z3as0n.fsf@boa.cc.lut.fi>
- References: <1082.6658T243T809@mbox.vol.it>
- <xWdrbMD0aez4@point86.people-s.people.de>
- <4jgpcf$elr@freenet-news.carleton.ca> <1094.6664T961T1734@mbox.vol.it>
- NNTP-Posting-Host: boa.cc.lut.fi
- In-reply-to: bizzetti@mbox.vol.it's message of 31 Mar 1996 17:16:51 GMT
- X-Newsreader: Gnus v5.1
-
- >I haven't seen the circuit nor have an AGA machine to play with. :( I had
- >one of the Philips TDA8708 may be 6 -7 years ago for $20. It does 32MHz
- >sampling rate at 8-bit. It also has a multiplexor input. It is also used
- >in various Amiga video boards for digitizing video. Right now Ram are
- >still $18 a meg and VRAM is about 2X (roughly).
- Moreover, the AgaEXTENDER's ADC are only 3 bits each (one is only 2 bits!).
-
- Philips has a triple-ADC with 6 bits per channel, which would be
- about perfect.
-
- I've scanned through the AgaEXTENDER doc (the one with 80bit mask,
- dunno if it's the latest). Some things I'm wondering about:
-
- 1. How the hell do you upload those 65536 palette registers?
-
- 2. Isn't it pretty slow using a 1536x625 screenmode with AGA?
-
- 3. How did you propose doing the scandoubling thing? It's
- really more than doubling one clock.
-
- Without making too exact calculations, the screenmodes you suggested
- might in fact be possible... with quite a lot of fiddling.
-
- -JP
-
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