S
Scott Parsons
Guest
Hi All
I am trying to repair a wesmar sonar and have traced the probelem to the
CRT Controller IC UM6845B. The IC was not producing any sync pulses and
so the display was the usual mess. I found that some of the early Amstrad
computers (CPC464) had the same IC. I finally managed to get hold of an
Amstrad and dutiflully pulled the IC out (Motorola MC6845 in this one)
popped it in and ..... a perfectly synced BLACK screen(sync pulses present
on the chip, but video blanked). Further research suggests that the
Motorola and UMC versions may not be interchangeable....
So I am trying to find the UMC chip.
Can anyone help
Thanks
Scott
I am trying to repair a wesmar sonar and have traced the probelem to the
CRT Controller IC UM6845B. The IC was not producing any sync pulses and
so the display was the usual mess. I found that some of the early Amstrad
computers (CPC464) had the same IC. I finally managed to get hold of an
Amstrad and dutiflully pulled the IC out (Motorola MC6845 in this one)
popped it in and ..... a perfectly synced BLACK screen(sync pulses present
on the chip, but video blanked). Further research suggests that the
Motorola and UMC versions may not be interchangeable....
So I am trying to find the UMC chip.
Can anyone help
Thanks
Scott