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MonsterROMinator... a ROMinator for Levco Monster Macs


Well-known member
OK, so as I've mentioned before, I've got a 128K Mac that's been upgraded with a Levco Monster Mac card... which means that the standard ROMinator won't physically fit; as the ROM sockets are under the Monster Mac card.

So, what I've done is cook up a new board layout that moves the flash chips up a ways to a spot where there is clearance. I'm hoping to get these off to manufacturing in time to start production on them on Monday (8/29/2016); and I'm posting the Gerber/Excellon files here so you folks can have a look it at it (and give any feedback you desire), if you are so inclined.

Note that I don't think this board layout will work on a Mac Plus; as I was under the impression that the ROM sockets were spaced slightly differently (as I only have a 128K + Monster Mac and an SE; that's all I can test with... and the SE, of course, is totally different).





  • MonsterROMinator.zip
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Well-known member
Oooo.  I'm interested in this!  I have a HyperDrive that I want to install, but it won't fit inside a Mac with a memory upgrade.  I wanted to have a 128K upgraded to 1MB with a HyperDrive. :)  So far this wasn't possible, but with your adapter, it just might be.



Well-known member
By memory upgrade, you do mean a ROMinator, right? This does not upgrade the RAM, just the ROM (and adds a ROM boot disk). It's basically just a physical re-work of this: http://www.bigmessowires.com/mac-rom-inator/

Do you have any photos of the Logic Board + expansion card stack-up? My PCB layout puts the flash chips up next to the connector that goes to the Analog Board; as long as that space is clear, I think it would work.

If you have an OS X machine handy, you can grab a copy of Cuprum from the App Store (there is a free "community edition" version) to have a look at the Gerber files for the PCB; otherwise any standard Gerber viewer for Windows (like ViewMate) or Linux (Umm... I think gEDA does that? Or perhaps KiCad?) should be able to open them.



Daring Pioneer of the Future
Staff member
There's any number of reasons someone may not have responded six years ago, so I'd say it's safer not to presume. I don't see it yet so tagging @bdurbrow - when you have a moment to take a look.