I finally got my IIsi delivered today to check this out.The 3 normal pseudo-slots for the IIsi are 9, A, and B. Pretty straightforward, and configurable card like the maccon ethernet can be configured for any of those 3 slots. The maccon ethernet can even be configured for slot E on the IIsi according to the documentation, which brings it to a total of possibly 4 usable pseudoslots.

But slots C and D are the trouble. Are these slots recognized by Slot Manager? They have no interrupt over the 030 PDS slot, but if you can get a card into those address ranges, will it be recognized?

I got one of these cards, and swapped A24 and A25, which swaps both address spaces: D and E, and 9 and A. Additionally I swapped /IRQ1 and /IRQ2 (9 and A's IRQs). The swap was performed by connecting pin C27 on the IIsi side to pin B27 on the passthrough side and vice versa, then severing the traces for those two lines on the PCB. Same thing for pin C4 and B4. I threw on one of these right angle dealies to get a more vertical arrangement. There may be more involved in swapping slots 9 and A, such as swapping /IPL0 and /IPL1 maybe.

[attachment=0]IMG_0121.JPG[/attachment]

I then configured the maccon ethernet for slot E and put it in the adapter, and the result is the above picture of it showing up in slot D.

So, it looks like the IIsi can have as many pseudoslots as you want, if you can:

1) Get the card showing up in the right address space.

2) Figure out interrupts.

But, the slot mgr will find it if you can deal with those two problems.

So, no more complaining about the IIsi ROM only allowing 3 pseudoslots.

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