nottomhanks
Well-known member
Does this card work with the Micron or Pivot cards? Very exciting!!
Is there a matrix of what works/doesn’t, or had the issue been resolved?After some back and forth it turned out that not all combinations of CPU and cachecard will run at 40MHz.
I swapped around different CPUs and even found a combination where the original cachecard would refuse to work resulting in a hard crash once the Carrera INIT loads.
I will be revising the PCB design a little and then post the gerbers and a BOM so everyone can build their own cachecards.
I think this was related to one of the CPUs actually being a 25MHz chip. All my 33MHz and 40MHz parts would work just fine.Is there a matrix of what works/doesn’t, or had the issue been resolved?
Most probably, yes. Sourcing the out of production stuff that's on there is painful enough already, so I'll avoid to add the trouble of finding non-fake CPUs on top of that.I assume you'd just supply the board (or someone else here who does this) and we'd need to source CPUs?
Not yet, the clock generator for the 040 probably is one of the limiting factors here - the same part is used on the Turbo040 and the Carrera040:Have you tried overclocking at all?
How does this fit an Iicx ? Do you need another extra board ?
I gave away two of them a month or two ago.This post shows the MicroMac IIcx adapter for the Carrera Might be a bit of unobtanium these days...
I am using a MC88916DW80 which is rated at a maximum of 40/80MHz for the B- and P-clock respectively.
The exact same clock generator (although at a lower speed rating) is also found on some Macintosh logicboards.
I have seen Turbo040s with 35/70MHz and lower 25/50MHz rating as well. All Carreras I have seen so far have used the 40/80MHz version.
I can provide the schematics of the Micromac IIcx adapter if you want. Got one of those as well.Thanks ! Looks only simple traces to create a PDS slot.
Should be straightforward to replicate
I can provide the schematics of the Micromac IIcx adapter if you want. Got one of those as well.
Also mind you will need the more uncommon socketed IIcx logicboard unless you are ready to desolder the CPU on your logicboard and put a socket in place.