> On 3 Nov 2018, at 01:27, Paul Berger via cctalk <cctalk@classiccmp.org> wrote:
> 
> Are you saying that there is a capacitor between input? output? of the 79L05 
> and the ground pins of the chips?  If so that would seem pretty normal as it 
> is usually recommended that you have capacitors to ground on both the input 
> and output side of a 3 terminal regulator.  Are the ground pins on the three 
> chips you mentioned isolated from the ground of the rest of the board?

Hi Paul,

The trace goes from power socket to pin 2 of the 79L05 and a small value cap 
which is connected to the GND plane along with pin 1 of the regulator. Pin 3 
goes directly to a decoupler then straight to those 3 chips which are isolated. 
Today I’ll break out the ’tin foil covered sponge’ method of tracing any other 
points on the board that I might have missed last night.

Cheers,
 
-- 
adrian/witchy
Owner of Binary Dinosaurs, the UK's biggest home computer collection?
t: @binarydinosaurs    f: facebook.com/binarydinosaurs
w: www.binarydinosaurs.co.uk



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