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I did miss it. Ah, that’s a shame. The latest one I’ve been trying to fix is a PB180 daughtercard - it is unstable (locks up after a few minutes doing a RAM test) with a RAM expansion card above 6MB installed. I’ve found out that if I blow a fan over the CPU card it remains completely stable...

Poo-ma

I can help. I have an iBook running OS 9 with a registered copy of Quark 4.1 installed. It’s actually a legitimate copy my Dad bought back in 1998!

I could swap the chips out for DIP sockets if you don’t mind posting the board to the UK. DM me if you are interested :)

How about a PowerBook?

Bombat

Are you contacting the pin momentarily, or keeping it held there during the read?

I’ve been messing around with the GALs on a Micron Xceed SE/306-48 according to your notes but haven’t got any to reveal their contents yet. I’m using a T48. Unfortunately, my bench PSU only goes up to 15.5V so this could be a bit of a show stopper. I just wanted to check: - that the...

double post

No, it’s definitely the CPU card in that case. Sorry if I’ve been a bit misleading. You could connect up to another Mac via serial after it sad chimes and see what the reported error is via terminal emulator. There’s lots of discussion about how to do this, also see Adrian’s Digital Basement...

I’m a bit suspicious of the MOSFETs on the underside of the main motherboard - I’ve seen these overheat and fail. I wonder if they could be relevant. Although, the problems here seem like a logic issue rather than power issue.

Ask @Melkhior

I wonder if it says anything under the label. It’s hideous!

The 475 wouldn’t have come with anything as small as a 40 - I think they were specified with 80, 160 or 250mb drives. It’s normal to have a speed differential between different brands/models of drives - the faster 40meg unit might be a newer design with a single platter vs multiple platters...

Sometimes LCPDS ethernet cards come with the machines and you end up paying the same as a standalone card. My vote goes to the 475 - soft overclock and an easily replaceable PSU are big advantages.

Has anyone designed a pcb for this?

Not sure about that, I’ve spent literally years trying to fix ongoing issues with PowerBook 160/180 boards, without a great deal of success.

The write up is definitely AI.

LLM alert :poop:

Not really. I’m grasping at straws…