Caps! -- Macintosh Quadra/Centris 610

[uniserver]

Macintosh Quadra/Centris 610

10 - 16v 47uf



$0.10

Aluminum Electrolytic Capacitors - SMD 47uF 16V 85C

http://www.mouser.com/ProductDetail/Cornell-Dubilier/AVE476M16D16T-F/?qs=sGAEpiMZZMsh%252b1woXyUXj1I8HhXNTU4SVfWs1%252bYL9m0%3d

$0.34

Tantalum Capacitors - Solid SMD 16volts 47uF 10%

http://www.mouser.com/ProductDetail/AVX/TAJD476K016RNJ/?qs=sGAEpiMZZMtZ1n0r9vR22f0Jgorj1M1ux2eqZRFky9I%3d

Thread linked: Capacitor Replacement Thread . . .

 

[uniserver]

Just got done with this one: Tantalum Capacitors.

This one was easy, Zero Corrosion.

 

[bbraun]

I can hear it crying out for a rom SIMM socket, a rom SIMM, and two 128mb sticks of ram!

 

[leitec]

bbraun, I ran across your site while googling the true RAM limit for these guys. (that's my board that uniserver recapped) So it sounds like you could do 64mb or 128mb SIMMS, but the OS would need to be patched, correct? I use this primarily for running A/UX, so there's no hope of changing anything.

 

[bbraun]

To support larger SIMMs, you need a modified ROM (which is why I commented that it needs the ROM SIMM socket populated), at least for Mac OS. I'm really not sure about A/UX, I haven't tried it with the modified ROM. It is likely that it uses whatever the ROM sets up, I doubt it reconfigures the memory controller. Reconfiguring the memory controller while running from the memory you're reconfiguring gets a bit touchy.

 

[uniserver]

so as it is, 128 megs is the memory cap?

 

[bbraun]

There are 2 RAM banks per SIMM slot, and with the stock ROM, those banks are limited to 32MB each, so 32MB x 4 = 128MB, plus whatever is soldered onboard. You can get this by using 128MB SIMMs in those sockets, you just get half the capacity.

 

[leitec]

Thanks. I noticed OWC has a 64mb SIMM listed for the Centris 610, but they didn't get back to me on whether it was actually compatible or listed by mistake. From your explanation it sounds like it is indeed possible, despite what Apple says. I might take a chance on those at some point. It'd be nice (and definitely sufficient) to have 132MB.

 

[uniserver]

Ah yeah… well this board seems great for A/UX now all you need to do is OC it to 30mhz Get a couple 64's in there,

I would assume you already have a Full 040 installed.

And maybe get one of these scsi hard drives kits from me

for 25 bucks, 73gig 10K RPM

 

[bbraun]

To clarify, I don't think 64MB SIMMs will show up as 64MB. Likely just 32MB, which is why you need the 128MB SIMMs to get 64MB per SIMM slot.

 

[leitec]

Ah, thanks for clearing that up.

uniserver, yeah it's a full 25MHz 040 but running at the stock 20. It came from an Amiga 4000 whose RAM sockets I broke while removing a huge Video Toaster board it had come with. Still one of my greatest retrocomputing-related disasters and regrets.

 

[mcdermd]

Did you replace the broken RAM sockets?

 

[leitec]

I couldn't find anything to replace them with. This was around 1998 (when I was 14... no financial resources) and I had a really hard time finding anything about it. I did once get it to load some early startup screen with the help of someone on Usenet, using something to weigh down the RAM so it stayed in place. But I never got it to boot to the OS.

Actually, now that I think about it the whole reason I took out the VT board was that I was trying to narrow down why it wasn't booting anymore. I had installed Debian on it, and when trying to reboot one time it just never came back.

I kept it for a few years, but--I hate to say it--I threw it out when I went to college. Today there's no way I would have done that.

 

[mcdermd]

I think we all have at least one of those kinds of stories.