Blue PRAM Battery Leaked! Radius 81/110 victim and assorted questions . . .

[Trash80toHP_Mini]

. . . at least I think I pulled out one of the Naked Blue Cells I bought new in the 20Kteens? Gotta find the baggie, definitely wasn't MAXELL anyway.

At any rate, if you have the plain Blue 1/3AA cells, pull 'em! Never seen one of these fail before. Been trying to get at every machine to make sure no cells remain in any of them. I'll install them for playtime only.

Which brings up the question of the day; who makes/sells the best button battery holder/replacement thingie for the stationary setups?

edit: https://68kmla.org/bb/threads/radius-81-100-yet-another-battery-acid-victim.51438/post-580071

 

[Trash80toHP_Mini]

Another Question: Are all Macintosh II PRAM Battery pairs Axials that are soldered to the logic board?

I've got a first release Macintosh II.0 that I haven't even tested yet. It pre-dates the NuChip ASIC Macintosh II.1. So wondering if this is just my problem or everyone with a Macintosh II has gone through it?

How are they usually replaced? Seems like the perfect victim for a soldered down Button Cell mod? Is it safe to test it with those suckers still in there?

 

[Phipli]

Another Question: Are all Macintosh II PRAM Battery pairs Axials that are soldered to the logic board?

Some are soldered straight to the board, some have a funny little daughter card thing that Apple started fitting to later IIxes and retrofitting to older ones and Mac IIs.

PS never consider any battery to be leak proof.

How are they usually replaced? Seems like the perfect victim for a soldered down Button Cell mod? Is it safe to test it with those suckers still in there?

I got a two battery cell switched coin cell holder on flying leads, and modified it to take a wire from the middle of the two batteries, then wired it into my IIx and velcro'd it down to stop it rattling.

 

[Trash80toHP_Mini]

Thanks, got pics? I have an early rev of a button cell battery adapter, but the cells rattle about. I'll likely make a custom PCB with button cell clips to keep things cool as can be.
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This Macintosh II.0 is just getting better and better the more I check it out! Almost like my (unbeknownst to me what it meant) oddly branded "D" Drexel 128K/Plus/Performer upgraded treasure.

First off, it's near immaculate inside and out, almost no dust collected inside! Feets look extremely low mileage.
37 year old caps in there with zero signs of leakage!
The only thing missing is the HDD mounting tray.
MINT Toby Card . . .

. . . and when I removed the drive shelf, I found this puppy inside!



MacSprint II 32K cache card accelerator! NOT FOR RESALE? I have to wonder if this was a test machine at Orchid and shelved when the NuChip Macintosh II.1 version was released? I hate it when things that aren't are claimed to be prototypes. Might could be "factory installed" upgrade thing, hence the NFS sticker, but no ROM revision stickers?

But it might just be an early revision that Orchid didn't bother to pull when the machine went into storage? Wondering if the ROMs are socketed on production boards? Very strange that they aren't socketed on this board? Dunno about the guesswork on any of that, but this thing sure is purty!

Is it safe to power it up to test? Thinking it won't boot due to dead batteries, but if it does, might a cap explode as some do in Duos?

edit: ROM is socketed on the Macsprint II JRL found on what appears to be a production board. NFS sticker replaced with serial no. sticker, but again, no Revision Sticker on the ROMs. At least the IC info is there. Can't tell if the ROMs on mine were scrubbed off with solvent on a Q-Tip or gone over with a magic marker. I've seen ICs with identifiers sanded off the top on a lot of boards from the day, but a ROM???

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edit: this turned into quite the tangent, but it's my thread, LOL! I'll do a resto project thread at some point copying this drivel over.

 

[Phipli]

It's just one of these with an extra wire added.

https://ebay.us/m/ipx6cp

You could also use two single cell holders. The switches would work properly then.

https://ebay.us/m/tVfBI1

https://ebay.us/m/jLlkNB

 

[Trash80toHP_Mini]

Yah! But I like the idea of using the button cell holders @Bolle put on his SE/30 Remix. A custom PCB soldered into the battery thruholes will be solid. No need for Velcro and look cool as all get out.