osiweb.org

Hi Tom there a couple mpi b-92's on ebay they lowered the price on,

Grant

Did you try ini 24 or some other track the higher the better ini does the whole disk but you can do individual tracks.

Hi

you are not missing any connections that empty plug is for a mpi 52 for the head on the other side if it had one.

i needed to have the HM jumper closed on mine bottom left of the picture.

Give that a go

pin 24 is closest to the edge of the 610

From the bare board, it looks like your replica takes modern Cherry keys, which is wonderful. I'm interested in the details of the keycaps you had made. Were they custom made by Cherry, or elsewhere The keys were custom made buy signature plastics for me , they are doubleshot keys the same as origi...

I acquired a 510 board and have started to get it running I used a variation of BillO's memory module as i found a UM61512 in my junk box for 64k i have 56k ram addressed , i will now try and connect it to my 610 to see if i can get the disk running. anyone have images of 65u or D for serial boards ...

I finally got my keys done, so this phase of the project is complete!! :D I had a couple missed traces on the 600 board but all in all it is a great success IMO. I have tested both boards extensively and all is working as it should. Bonus data seperator project works flawlessly and is setup for moto...

Yes the Transmitter board layout does show jumpers to inverse the power on the 7417's it all makes sense now.

FYI , there are 2 different 620 schematics 1 on this site and 1 on marks osi board index, both appear to be the same at first glance but in reality are polar opposites one would be used for 600/610 to 48 pin buss the the other would be for 5xx cpu board to use the 610 for memory and floppy control t...

Hi Tom

3A is not enough to power both boards with full memory , don't connect the 610

Grant

the 600 and 610 should have 3A each at least so 5v 10A would be best that's 50w