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Do you know roughly what sort of price is involved doing it yourself buying the PCB & components and then re-using any custom components that can only be got from an existing donor board? Do you need to buy a minimum of so many PCBs for the replacement logic board?

This is very interesting and also the first time I saw the options inside Compact Virtual. I never realised it was so specific to individual accelerators. There were lots of different accelerators out there but also a lot of rebadging of the same old ones at times with just a higher clock speed...

No I was unaware it was needed at the time. It mentions here https://www.micromac.com/products/compact_virtual.html that Compact Virtual would work with older Compact Macs that had a 68030 processor that includes the PMMU. It doesn't specifically mention it also supports older Macs using a...

Searching Xpanse found this earlier 68k thread with some pics inside the box and the PCI interface card!: https://68kmla.org/bb/index.php?threads/second-wave-quot-s-pci-gt-nubus-expansion-box-amp-others.21907/

The chasis by Second Wave that allowed you to connect your old Nubus cards to a newer PCI Mac was called Xpanse PN series and was available from June 1995. Pricing at the time was $595 - $1895 for a 2-, 4-, or 8-slot NuBus expansion chassis. I guess this was a way to market the same thing...

Many years ago I attempted to get a 68851 MMU working with an Orion 68020 accelerator I had bought for an SE. The accelerator board had a socket for the MMU so I ordered one from MacLine around 1992 and fitted it. At the time I was using Mode32 and System 7 with the software for the accelerator...

Yeah its fun pushing them to the limit to see how long they will last. At least with the LC pizza box models it only takes 30 seconds to pop off the lid and take a peek inside to see how things are going. I love older electronics and machinery in general - they were nearly always built better...

I think C137 is ok for now: The caps under the RAM stick are still shiny - with no dulling on the solder. The LC floppy drive was a bit wonky a first but it sprang into life reading both PC and Mac disks successfully after it got a clean. Are those 1.4MB floppy drives getting tough to source...

I took another look at the logic board in my Performa 475 which is now over 30 years old. I don't see any signs of dulling solder joints or leakage so far. It could do with a wash though to clear out some surface dust and clean the contact areas. The fan duct also needs cleaned. I'd like to...

Yes it would have given the SE/30 access to all of the cards available for Nubus. Even for an SE model the idea of 4 SE PDS slots is mind blowing providing the possibilty for acceleration, a 2 page monochrome display card, 24 bit colour display card, a DOS emulator card or a network card!

Found further notes on this same chasis from 1996. By March the same UK distributor was offering the 4 slot Nubus version for the SE/30 + interface for just £395 + VAT which was a massive drop in price. They also indicated this old style Nubus chasis could be made up specifically to order and it...

From memory I first heard about this product in a small advert placed in MacUser UK. I wrote to the UK distributor and asked if they could send me more information. There was no email address so this was a letter I typed on the SE, printed on the Imagewriter II and physically posted to them. I...

For those interested here is the pricing from January 1991 and also some revised prices for specific models I enquired about in August 1994:

Wow - didn't realise that. Very interesting. I just remember looking through various seller catalogues and MacUser magazines and thinking there were so many different boards available it was mind boggling. It always seemed to me that these 'new' accelerators tended to appear shortly after new...

What type of accelerator do have in your SE that allows 16MB of physical memory or did you swap out the logic board for an SE/30?

One final suggestion that also worked for me before I got Stepping Out II was to use Quickeys or Tempo II to create a macro that runs an operation to resize a window. You can program almost anything with those programs and hit a key to trigger them. I preferred the ADB Extended keyboard so I...

Yes this is brillant. It got round pretty much all the limitations of smaller screens. You just setup a virtual screen size based on how much memory your Mac had and never needed to a scroll again! You would just move or flick the mouse and could jump around the whole virtual screen almost...

In an updated 1991 brochure from the distributor there was even an interface assembly for the IIsi to allow it to use 4 or 8 Nubus slots. The homebase chasis for the Macintosh Portable supported just 2 SE slots. Still I'll take 2 over none!

The Orion card I have allowed acceleration on one card, with an optional socket on it to connect a further card for a video output. There were others like this as well so it seems the SE design did support multiple cards in a round about way. It was all a bit messy though because the socket on...

Regarding support for the Macintosh Plus the brochure mentions: The clip onto the processor approach was used in early accelerators for Macs that had no slots so I guess Apple Service Center was just there to make a nice hole in the back for the cable out to the chasis box! I think this opens...