PET 2001 oddity - solved! - test-drb@ccmp.vtda.org

18 Jan 2003

On Jan 18, 13:28, Adrian Vickers wrote:

...
  Turned out to be dead simple; yet another blown 2114.

 I figured the chip @ $0400 (i.e. the start of BASIC) was faulty, seeing as
...
  how the machine wouldn't take a single line of
BASIC. So, I swapped the
 appropriate bank out to another bank - and presto! BASIC worked again. 
Good!

...
  Having done this, I then swapped *one* of the two
chips (according to the
 schematic, there are two chips for each $0400 block of memory - why is
 this?) 
A 2114 is 1K x 4 bits wide, so they're used in pairs to make bytes.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York