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elbaroni

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Got the MacRescue working — six 1 meg SIMMs, recognised as as four megs. I was hoping that I could get the RAM disk working, but Connectix Compact Virtual which was reported on vcfed.org to be the right software is actually a virtual memory utility, not a RAM disk one. Bummer. It would be really good if we could get the proper driver for this, or at least find out its name. 

 

Also managed to zap myself while reassembling the 512. Always fun, not. 

 

*All three jumpers set to "on", by the way .

Edited by elbaroni

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Are you sure the MacRescue supports a RAM Disk?   The Newlife upgrades did not.   They had eight SIMM sockets for versatility, but the largest RAM configuration was 4 MB, no RAM Disk.    It's hard to remember what RAM prices were like back then, but there was a period when 256KB SIMMs were almost free, and 1MB SIMMs were still $100+.    So one could save a bit by installing the NewLife upgrade in a 512KE and then using six 256K and two 1MB SIMMs to get 4MB total.   I think 4 X 1MB was also an option, but that then ignored the 512KB on the logic board.

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Fair point Trag - I don't think I've seen any contemporaneous information to that effect, but everything I read online indicates that it does. It would make sense to let people use more SIMMs, but I wonder if a Mac Plus can actually address more than four? Mine seemed not to work with six 256k SIMMs installed, but perhaps that's a symptom of something related to the "256k only" jumper on a Mac Plus logic board. 

 

I'm pretty happy with my SCSI-clad and 4meg-stuffed Mac 512 though, RAM disk or no. 

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Once the SIMM sockets are on  an upgrade it's an open question.   The CPU just puts out addresses and Read/Write signals (and a bit more bus mananagement cruft).   The memory controller logic determines how many SIMM sockets are supported and of what capacity.   Does that MacRescue upgrade have a 68000 on board or is it just memory and some extra logic?

 

It doesn't seem to make sense that there would be six sockets and then not support having six SIMMs installed.  But it might not support 6 X 1MB.

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It has a 68k chip on board, which sits right above the one on the motherboard. Not sure if it *is* the one from the motherboard resocketed or not. 

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A LaserWriter Plus update. I have a "new" cartridge for it.

 

Boots up happily, tries to draw paper from the sheet feeder and jams without moving anything. Not unexpected. What is irritating is that the foam sealing the little door over the imaging drum of the cartridge melted immediately. I always thought that was a function of the thing having sat around for a million years (which of course may well be the case for this one too). 

 

Tried from the manual feed and...we're not as far off as we might be:

Screen_Shot_2019-07-28_at_2_08.47_pm.thumb.png.00a00e4215d145dd5650660057ee914c.png

 

Not a total triumph, but not too shabby. 

 

The thing won't show up in AppleTalk from my Plus. Anyone know if there's a upper limit to the LaserWriter driver that'll see one of these? More probably it's one of my network cables being problematic, but I only have one Appletalk cable and one DE-9 Appletalk box. Will need to see about that. Screen_Shot_2019-07-28_at_2_10.52_pm.thumb.png.10078fa810127119267b8952b87fe558.png

 

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Odd about it not showing up, I've got both of mine (Plus and original-upgraded-Plus) to show under the original LaserWriter drive, and the "LaserWriter 8" driver.

 

The jams caused when using the paper tray are caused by the degrading of the paper pickup rollers. I've had two variations of this problem. The first involved the rollers turning to sticky goo. For this, I cleaned it all off, and then (this took a while!) stick double sided sticky tape on them, and then a rubber band onto that. This isn't a recommended fix - but it's been working for more than 5 years like that now!

 

The rollers on my second LaserWriter have hardened rather than softened, which means they just slide over the paper rather than gripping it. I'll probably take this one apart and fix the rollers properly, now that I have the service manual and take apart instructions for it.

 

Where did you get the toner from? I'm guessing you got a HP 92285A rather than an Apple original? I'm having a hard time finding a toner cartridge that's in any way usable.

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I think mine have hardened, but need to look closer. 

 

I got a knockoff cartridge to see if the printer worked. Wouldn’t recommend it - foam seal on it melted as soon as I put it in, so I think it’s very old. I’ll see if I can work out where, but it’s not showing up in email search for some reason. 

 

‘his is right, but expensive (although I suspect you get what you pay for):

https://www.tonercartridgedepot.com/canon-lbp-cx-4875-d.html

 

‘If I can get it working fairly well I’ll buy a proper cartridge. 

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Further on the LaserWriter — might be some liquification of rollers:

 

 

027EE077-FA54-4D2C-83A5-A43E8C6E19DA.jpeg

 

Service manual tells me this is called the “Transfer Guide Assy”, but I’m pretty sure I’m going to need to take the whole thing apart and clean everything. 

Edited by elbaroni

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try washing the board with 90% or higher alcohol, soap, and water.  then dry it thoroughly.  see if it turns off.  usually washing a board will give you an idea of if recapping will solve the issue

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I've not had much luck with NOS unsealed toner for my other laserwriters, so I've always been reluctant to spend the higher prices on the 92285A.

 

The picture you posted is of the separation belt - the small plastic strip with the spring on the end. There's a little bit of info on this in the owners guide - which I can't seem to find online, do I can send you pictures if you want? This is rather crucial to getting the paper through it unharmed - and it's a consumable part, but impossible (imo) to find new ones any more.

 

I'm not quite sure which roller the stick black mess in the photo has come off - but I can have a look in mine and post pictures if that would help.

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I think it's the gunked-up roller that's the issue rather than the separation belt itself, which looks to be intact. Stripping the whole thing down, cleaning it thoroughly, and treating or replacing the rubber rollers everywhere is in order. Hopefully the problem with Appletalk is the cable. Will have to check the cable with a 512. 

Edited by elbaroni

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@olePigeonMaybe, but wouldn't most be NOS at this point? If so, they could have the same problem. The good thing there is that most would likely be quite a bit newer than any original part, so the odds of finding some intact and usable are better, and with the benefit of experience (knowing how and why they fail), measures can be taken to preserve and prolong their useful lifespan.

 

And maybe, if there's enough demand, some enterprising person could contact some Chinese factory and have new replicas made using all new materials. Such things have been done before (eraser's IWII color ribbons, BMoW's DB19 floppy port, etc.), so there is a precedent.

 

c

Edited by CC_333

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17 hours ago, CC_333 said:

And maybe, if there's enough demand, some enterprising person could contact some Chinese factory and have new replicas made using all new materials. Such things have been done before (eraser's IWII color ribbons, BMoW's DB19 floppy port, etc.), so there is a precedent.

I think the "if there's enough demand" might be an issue here. While there are quite a few people with IWIIs and a fair demand for the DB19 (not just from 68k macs), the number of people with original LWs/LW pluses, or the original LaserJet/whatever the Canon machine was that took these, is going to be fairly low I imagine (although I'd be delighted to know I'm wrong on this!). There are always a few on ebay for around $50, and while they do sell I'd be (pleasantly!) surprised if there's enough demand to justify the quantity a factory would need to make.

 

I have wondered how possible it would be to take the imaging drum (which for me has been the usual point of failure, creating ghosting and other issues) out of a new cartridge and put it into an old one. The technology can't have really changed (can it?) so if one of the right dimensions was found, maaaaaaybe it would work? Thoughts?

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