Re: 6569 luminances

From: silverdr_at_wfmh.org.pl
Date: Sat, 4 May 2013 18:59:12 +0200
Message-Id: <C9E126BE-4EFD-4C7E-A8F2-557ABE75D7C7@wfmh.org.pl>
On 2013-05-04, at 18:09, Gerrit Heitsch wrote:

>> I had a moment of inspiration today (after Michau asked about the SX ROMs) to check how it is done in the SX (I thought it was like in the older 64s) and.. it occured that there are actually /two/ crystals piggybacked one on another and just three 74LS chips next to the passive stuff on the daughterboard called "clock unit".
> 
> Would it be possible to post the frequencies of the 2 crystals and what 74LSxxx are on the clock board?

LS thingies are just a D flip-flop (74LS74), an inverter (74LS04), and a counter (74LS161). One crystal is the regular phi_color clock crystal (either PAL or NTSC - 17.xx or 14.xx) and the other one is not visible as the mentioned one sits on top of it well soldered together. I'd have to disassemble the first one but I ran out of desoldering wick and I don't want to go any quick'n dirty way so it will have to wait until next week(end?).

-- 
SD!


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