JP18 and JP19 linked (720 mode)
JP22: 2&3 (8MHz 1772)
Are those the ones you are referring to?
JP18 and JP19 linked (720 mode)
Oh, interesting (that the GAL with SJ3 soldered did not work).
720k disk images work fine for me regardless of what the GAL was set to do. Just could not get 1.44mb disks to read from my Gotek. I need to check that 16mhz feed from the shifter looks correct with my scope and do some further testing.AndresPlazaR wrote: ↑Fri Mar 05, 2021 10:09 pm Oh, interesting (that the GAL with SJ3 soldered did not work).
I'm using 720k images.
Pin 1 in the GAL measures 16MHz +/- 0.12 : Pin 18 in the 1772 (@kodak80 ) measures 8MHz +/- 0.13 :
What clock do you get on GAL pin 14 which is clock output from GAL to WD1772?
These look normal clocks.AndresPlazaR wrote: ↑Fri Mar 05, 2021 10:30 pm
Pin 1 in the GAL measures 16MHz +/- 0.12 :
Pin 18 in the 1772 (@kodak80 ) measures 8MHz +/- 0.13 :
There is no clock on GAL pin 14, only 5v.
Did you program the GAL yourself ? Either its not programmed correctly, or faulty GAL by the sounds of it.
Good spot!