xodaraP
Legendary
Hi guys,
I have a Truxton board that isn't working - I've checked all the ROMs which are present and correct, the customs are all making good contact (that wasn't a quick job with a multimeter) and both the Z80 and 68k appear to be fine (I have replaced the Z80 as I believe it wasn't happy). I know that the 68k won't start unless the Z80 is running correctly, but I'm not sure what's holding up the Z80.
- Z80 is stuck on reset, 68k is running (reset line is high)
- Both CPUs have clock
- ROMs have tested ok
- Main program RAMs (6264) have been pulled and tested ok
- Sound RAM (6116) pulled and tested ok
- Sound ROM replaced
- Yamaha YM3812 pulled and replaced (connected to Z80 reset line)
This is what I get when I plug it into the Astro:
And I probed the sync line with the scope to see what I get there:
I have a Truxton board that isn't working - I've checked all the ROMs which are present and correct, the customs are all making good contact (that wasn't a quick job with a multimeter) and both the Z80 and 68k appear to be fine (I have replaced the Z80 as I believe it wasn't happy). I know that the 68k won't start unless the Z80 is running correctly, but I'm not sure what's holding up the Z80.
- Z80 is stuck on reset, 68k is running (reset line is high)
- Both CPUs have clock
- ROMs have tested ok
- Main program RAMs (6264) have been pulled and tested ok
- Sound RAM (6116) pulled and tested ok
- Sound ROM replaced
- Yamaha YM3812 pulled and replaced (connected to Z80 reset line)
This is what I get when I plug it into the Astro:
And I probed the sync line with the scope to see what I get there: