68kMLA Classic Interface
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| Click here to select a new forum. | | IIsi Twinspark equivalent or DiiMO cache adapter clone: Does it exist? | Posted by: Boctor on 2025-05-14 12:32:10
Hello. Are there any modern PDS 030->IIci Cache adapters out there for the Macintosh IIsi? Commercial or DIY, I'm not picky and only really care about availability, as I've been searching Ebay for quite a while with no luck yet. I'm aware the DiiMO 030 has been comprehensively reverse-engineered, but I have not seen much in the way of clone IIsi adapters, as the SE/30 is understandably far more popular.
A TwinSpark with a DiiMO 030 electrically works fine in my IIsi, but the PCB is obviously much too tall. | Posted by: nickpunt on 2025-05-14 14:26:46
I have two Micromac ones that are slightly different. I'd like to hold onto these for my own builds but if @Bolle or anyone wants to pick at them for reverse engineering efforts I'm happy to oblige!
The first came with a Diimo 030 for IIsi. Red lettered GAL16V8B 10LP (presumably 10ns) B316D08, lacking any front-side resistors or capacitors but has a bodge on the back as the trace was to the wrong wire. Resistor is same position as the other, just on back. Part # 632-10036-002A.
The second came with a Carrera 040, white lettered GAL16V8B 15LP H442D09. It's got 4 capacitors and a resistor on the front but no bodges since the board is later rev with the fix. Part # 632-10036-003A.
I only tested the first on a Diimo as the Carrera caps were blown when I got it. The two mysteries are whether the additional caps are necessary for e.g. Carrera, and whether the GALs contain any different logic. | | 1 |
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