I have a programmer and probably have EPROMs I can donate to the cause if
there are dumps available I can use. My scope is a 2465B, so I can¡¯t just
clone ones from that.
On Sat, Jun 6, 2020 at 17:08 <trogg58@...> wrote:
Hi, Andy, thanks for your reply, yes I do have the manual and have waded
through the self test routines and blinky Leds, or lack of! ... they only
come on and stay on so i have looked at the p.o.s.t order, waveforms and
flowcharts, I think i have possibly.... narrowed it down to the the 2
eeproms on the A5 Control board, U2378 and U2162. In fact I can remove both
of these and it makes no difference to where the bootup sticks or the whats
on the CRT display. I am beginning to wonder if ... while I was waiting for
the Caps to arrive, I put the scope back on the shelf in the garage
(without the outer sleeve), now most unusually it has been quite sunny the
last couple of weeks here in the UK and i'm wondering if the UV erasable
EPROMs have been erased to some degree..... I am trying to get my hands on
a copier so i can try and....
a) attempt to checksum and or
b) recopy, if i can find the hex/bin files
I have added another couple of piccys to the "John 2465 Project" photos.
Just a quick note, I have also added a close up pic of the leds, difficult
to see which ones are on or is it bleed over ?
Thanks again
--
Andy
