68kMLA Classic Interface

This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.

Click here to select a new forum.
Sonnet Doubler Allegro for Mac II
Posted by: David Cook on 2025-05-19 08:10:33 The SWIM does play absolutely no role at all at how much memory the Mac II will support. The IIcx adds a GAL on the logicboard that is sitting between the DRAM control signals that the GLUE puts out towards the RAM to get around the "faulty" signaling sequence that sends higher capacity DRAM chips into test mode basically making them fail. The same is true for the SE/30. Thank you for these answers. It really clears things up. I honestly couldn't see how the SWIM affected memory, but I have been reading that table wrong.
Posted by: Arbee on 2025-05-19 10:09:39 Anyway, with this accelerator and the FDHD/IIx ROMs, you should be able to use any memory configuration that works for a IIx, IIcx, or SE/30.
Posted by: David Cook on 2025-05-19 10:11:23 I was never able to find any SIMMs larger than 4MB. I don't think they exist. Oh they do! I have a IIx with 128 MB in it.
Posted by: ObeyDaleks on 2025-05-20 19:45:13 Oh they do! I have a IIx with 128 MB in it. View attachment 86880 Goodness (drool)! I wonder how much this would have cost back in the day.
< 2