Mike's PCjr Page

As far as I can tell, both memory strobes going to the side car connector off the main board either never go active on memory reads or writes to D0000->EFFFF or the data bus transceiver never gets enabled. There is a ROM chip on the board that sources bus transceiver enables based on the upper addre...

As far as I can tell, both memory strobes going to the side car connector off the main board either never go active on memory reads or writes to D0000->EFFFF or the data bus transceiver never gets enabled. There is a ROM chip on the board that sources bus transceiver enables based on the upper addre...

Few items for general discussion: A) It appears as if the sidecar bus buffers are floated during accesses to D0000->EFFFF. Nothing I seem to do will return valid data in those ranges. I don't suspect anything wrong with the board at this point. Everything else seems to work fine including memory fil...

Got the connectors! And they are indeed the real deal. Brand new in a Tyco box even. I have 25 now. Of course being 2 separate part numbers, there are no screws. But that's pretty minor.

The other quote from Aesco came back as $11.65 & $2.70 respectively. So I ordered 25 from State Electronics. Not sure how long it will take to get in or if it will actually be the real deal since Amp hasn't made them in well over a decade. I'm going to cross my fingers anyway. At least this will...

I did get a valid signed quote back from State Electronics for AMP 532773-2 (60 pin stacked box connector) $8.90 and AMP 532771-2 (60 pin shroud) $0.75. I think I might order 25 of each to have on-hand. I have another request for quote out. Going to wait for it first. Would save tearing up side-cars.

OK, So the boards came in today! I have some good news and some bad... nm, a lot of good news! The pins fit! The drills are perhaps a bit on the loose side, but they do snug up nicely with a pair of needle nose leveraged against the board pulling them through. The only concern I have after grafting ...

I'm likely going to have to push this another week. I have to fly to south Texas tomorrow for a couple days as the proverbial **** hit the fan at the factory. I have most everything layed out. I measured the side car pins today so hopefully that issue is resolved. The CF adapter is definitely out.

Correction, it may not have Compact Flash. There is only about .4" between the 40-pin IDE header and the CF socket pins. That's nearly impossible to route in 2 layers. I'm looking for alternatives atm.

Option D it is. Next spin will have all three