jmacz
Well-known member
Will add this to my todo list at some point.
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PowerBook 540c black coffee edition
- Thread starter MacUp72
- Start date
Will add this to my todo list at some point.
3lectr1cPPC
Well-known member
I'm gonna have to do this too! Very cool. What's the link to the crystal you bought? And how tough are they to solder in.
MacUp72
Well-known member
I got that crystal from Bolle, so I dont know, I think its an obsolete Epson part. When I google '20 mhz sg-615p d152e', there come up some very similar ones:
croissantking
Well-known member
Done it!yes, do it..desoldering is a bit fiddly but doable..
Seems stable so far.
The new crystal was almost too small for the pads, but I made it work.
This is a pretty tricked out 540c - max ram, bluescsi and 40mhz cpu.
3lectr1cPPC
Well-known member
Which part there is the crystal?
croissantking
Well-known member
The mouser part is 449-LFSPXO018787REEL
3lectr1cPPC
Well-known member
That’s good to know - I was wondering which part on the board physically that is.
Edit: it’s top right, isn’t it?
Edit: it’s top right, isn’t it?
croissantking
Well-known member
Ah, it’s G700 in the top right hand corner.
3lectr1cPPC
Well-known member
Well I’ve gotta make a mouser order in a couple days, so I think I’m gonna get two of these and overclock my 540 and 540c!
How hot is it getting? That would be my only concern.
How hot is it getting? That would be my only concern.
croissantking
Well-known member
It’s certainly warm around the CPU after having it on for a bit - but that doesn’t really mean much without comparing to how it was before. I may run my 520c (@25MHz) alongside for a while and feel the temperature difference.
3lectr1cPPC
Well-known member
As long as it's stable... I think I'm gonna do it! Would certainly be a fun project.
croissantking
Well-known member
Go for it. Let us know how you get on.
3lectr1cPPC
Well-known member
I'll certainly update here! I'll likely also do a video on it for my YouTube channel at some point too.
It's perfect timing really, I'm anticipating a cap order in the near future. I'm supposed to be getting in something Tuesday that's gonna need work...
It's perfect timing really, I'm anticipating a cap order in the near future. I'm supposed to be getting in something Tuesday that's gonna need work...
MacUp72
Well-known member
great, looks good, your crystal looks like newer part..and you alss have a BlueScsi in it..
did you solder your 32MB RAM yourself?
croissantking
Well-known member
Yes, I did! It started life as a 4MB module.
jmacz
Well-known member
Is there a slightly larger part on Mouser available?
croissantking
Well-known member
Go rummage, haha. I couldn’t find a better option - seems this is the standard footprint nowadays.
jmacz
Well-known member
You're right... don't see 4-SOJ package crystals on Mouser.
croissantking
Well-known member
I salvage them from dead PowerBooks, but I didn’t have a 20MHz part handy.
croissantking
Well-known member
So with the overclock. Tattletech claims the bus speed is still 33MHz, but I wonder if this is erroneous. I would have thought the bus speed would be 40MHz as well.
What’s the best 68k utility (like Gauge Pro) for looking at this sort of info?
