My OSI 610 build - Expansion for the OSI 600

[stephen_usher]

*sigh*

[rubber_jonnie]

*sigh*

That's about the top and bottom of it...

[HigashiJun]

And just to annoy me even further, the FDD interface no longer works, even though the RAM upgrade does...

:cry:

[rubber_jonnie]

And we're back up and running :)

IMG20250717112236.jpg

Turns out the FDD side requires PHI2 from the CPU (Pin 39) and there was a bad connection between the CPU and pin 39 of the CPU socket. Now that's remedied I can boot just fine again.

Sometimes it's the simple things that go wrong.

I can get back to looking at FDD's now :)

[HigashiJun]

:bravo:

[rubber_jonnie]

:bravo:

Thanks :)

[rubber_jonnie]

Wow, another ROM just died, that's 5 bad 28C16's now, up and running on another but the other spares I have, UV erasable 27C16's just won't program. I'll have to try them on the other programmer I got from @exxos see if that works.

IIRC I bought them from Ali Express originally, so that probably speaks to their poor reliability. I think the 27C16's were from eBay. If they don't work on my other programmer then they are toast.

[exxos]

What programmer are you using now @rubber_jonnie ? Don't think I ever seen a programmer do the C16 / C32 / C64 chips yet.

[rubber_jonnie]

What programmer are you using now @rubber_jonnie ? Don't think I ever seen a programmer do the C16 / C32 / C64 chips yet.

I was trying with my TL866 Pro, it's 'supposed' to do them but doesn't. Going to try the MQP170 shortly.

[exxos]

I was trying with my TL866 Pro, it's 'supposed' to do them but doesn't. Going to try the MQP170 shortly.

I've no idea if it supports those. I mean is DOS stuff mostly, so it should be old enough..

You maybe have to build a adapter and pretend its a larger size and hardwire the extra address lines low.. If the devices have the same number of pins, you could use a 32 as a 16 etc that way..