Re: 6569 luminances

From: Gerrit Heitsch <>
Date: Sun, 02 Sep 2012 18:34:41 +0200
Message-ID: <>
On 09/02/2012 12:23 PM, wrote:
> On 2012-05-13, at 19:36, Gerrit Heitsch wrote:
>> I kind of like the 250407 boards. The last board revision with the discrete PLL using the MC4044P and 74LS629.
> Can the MC4044 be still easily obtained?

That's the only chip so far that I haven't been able to get cheaply. On 
the other hand, so far I didn't have one fail on me.

> 74LS629 doesn't seem to be very common anymore either and when still available then for some 4-5

As far as I know, that one is still in production and at least I was 
able to get my handy on 5 of them for less than 10 Euros incl. shipping. 
Didn't have a dead LS629 yet either, so it's just to be sure.

Also, the 74LS629 ist, according to the datasheet, similiar to the 
74LS124 (maybe only different pinout?). Might be possible to get that 
working in a C64.

> I take 8701 is gone together with CSG or is there some kind of replacement available? Or is it another candidate to be placed inside FPGA?

The 8701 was MOS/CSG only. Sometimes you can find them cheaply on ebay.

It should be easy to come up with a circuit that does the same thing, 
take the crystal clock and divide by 2.25 (for PAL). The 8701 does that 
by doubling and then dividing by 4.5 (PAL).


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Received on 2012-09-02 17:00:04

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