Date   : Wed, 10 Jan 2007 23:31:57 +0000
From   : splodge@... (Richard Gellman)
Subject: 8-bit IDE not interfacing

Hi,

This email is mostly directed at Jonathan Harston, since its his circuit 
I've built, but all input is welcomed...

I've built the 8-bit IDE interface, and connected it up. I soft-loaded 
ADFS 1.53 into sideways RAM (until my EPROM issues get sorted) and... 
nothing.

Some probing on the 1Mhz bus side of the interface shows A0/1/2/5/6/7 
are operating, R/W is operating, and a clock is present on 1MhzE. The 
IDE drive resets as expected on BREAK, but the NPGFC line I can't seem 
to get a reading on. Both my Master 128 and Model B show NPGC as 
hovering around 3.4V, whether the port is being read/written or not.

Is the line supposed to read that way and I'm just missing a vital bit 
of intepretative knowledge? I've checked and rechecked the circuit 4 
times.. its in working order and matches the circuit diagram.

Any thoughts?

-- Richard