Re: C64 PCB

From: silverdr_at_wfmh.org.pl
Date: Sun, 7 Jul 2013 18:45:26 +0200
Message-Id: <DCC3F645-175E-4C77-B602-901AC0B874B0@wfmh.org.pl>
On 2013-07-07, at 16:31, Gerrit Heitsch wrote:

>> I think I have this KU photo from you already (1894x953 px)
>> 
>>> As for the raster... so far all boards I had use a raster based on 1/10th" (2.54mm), not only between pins, but also between ICs.
>> 
>> I mean the ROM chips placement raster.
> 
> So do I... The later boards have 2 ROMs spaced apart 5,08mm (You can put one extra component hole between them. Between ROM and CIA, you have 7,62mm (3/10th") space (space for 2 extra component holes). The ROMs are twice that wide (15,24mm or 6/10th")

This methodology is a bit "overengineered" to me ;-) What counts is actually the distance from pin 1 of one of the chips to pin 1 of the adjacent chip. This way we don't need to involve any arithmetics.

> Just checked on the KU, there you have space for 3 pins between the ROMs, making it 10,16mm. So a ROM is 15,24mm wide, the space between them is 10,16mm which will give you 25.4mm between Pin 1 of 2 ROMs. That would be 1".

If you have a caliper, could you please just measure the distance from pin 1 to pin 1? I am somewhat anxious with this calculated 1.0"

-- 
SD!
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Received on 2013-07-07 17:02:00

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