Re: C64 PCB

From: silverdr_at_wfmh.org.pl
Date: Sun, 7 Jul 2013 19:16:21 +0200
Message-Id: <00E4562D-5088-4DD0-9EBD-249C1B5822FA@wfmh.org.pl>
On 2013-07-07, at 18:56, Gerrit Heitsch wrote:

>>> 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.
> 
> Still, it's nice to make sure to understand the methology behind it, calculate it and then check if it is correct.

Agreed.

>>> 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"
> 
> Still comes out to 1"... I used a tape measure.

This means that in fact the raster is bigger than in the SX. And judging by the photo, the "5pin" has also 1.0" raster there, although the illusion is that it looks wider than KU.

-- 
SD!
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Received on 2013-07-07 18:00:04

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