Recent content by Ragnarock

I don't think I can put a FB link here so search on "Xerox 820 CP/M Computer" in groups

https://www.facebook.com/groups/519688449587493

Great, the 820 is a good solid, yet boring-looking, machine. I've got one with dual floppy drives, and 2 with hard drives but neither of the hard disks work. There's an 820 group on FB.

Would anyone happen to have an old Arrick Quick Switch from the early 80s in their junk bin? They had card edge connectors for the TRS80 I and III. We made a few thousand. Several hundred were hand nibbled and hand-lettered by me early on. Lots were sold here in the DFW area through computer...

Would anyone happen to have an old Arrick Quick Switch from the 80s in their junk bin? They had card edge connectors to match TRS80 I and III. We made a few thousand. Several hundred were hand nibbled and hand-lettered by me early on. Lots were sold here in the DFW area through computer stores.

I need the 40-pin DIP chip labeled 70200 in this Televideo 910. Anyone have an extra or know where to get one? Or know anything about it?

I'm looking for an IBEX dual 8" floppy drive box to restore my system to completion. Ibex was a CPM machine back in the early 80s. -Roger in TX

So here's part of what's going on with my 8 serial ports, these 4-port serial boards from Sigma are numbered opposite of DEC's DLV11-J. This sigma board has the port numbers from left to right J4, J3, J2, J1, and DECs is J1, J2, J3, J4. You'd think if someone was gonna clone a board they'd put...

Semi-weird, this distribution board (1 PCB with 8 DB25) from top to bottom appears to be ports 3,2,1,0 (Console),7,6,5,4. With females on 3,2,0,7 and males 1,4,5,6. I realize the 40 pin cables could be switched, and the board switched, but that's not how this was made. Can anyone explain the...

On the back of this SMS there are 8 RS232 ports connected to 2 quad port QBus boards. The 4th one down is my console at 9600 baud. That's obviously line 0. So which connectors would be logically connected to 1 and 2? This physical arrangement doesn't make sense.

Here is CALAY.BAK %CONFIGURATION FOR CALAY USA SPRACHE ENGLISCH PROZESSOR QBUS 23 WORKFILESIZE 300 LIZENZNUMMER 25 MEMORYGROESSE 836 DEVICE 0 VT52 DEVICE 1 BIDP40 DEVICE 2 VT52 UNIT C MIL % COORDINATE UNIT S MIL % SIZES %DEVICE 4 BIDP40 GRAPHIK 5...

Attached is a file that WAS .LST on the Calay machine, I renamed to .TXT so I could attach here.

UPDATE on the SMS11 CALAY disk file Archive. The system boots solidly into RT11SJ V4. I want to capture all 503 files (binary and otherwise) down to my PC for preservation FIRST! Some have suggested PDP11GUI but I dont see any specifics on downloading files, am I missing some basic load and...

Wouldnt you say the vast majority of CP/M systems use 177x, 179x disk controllers? Some with DMA, some not, but there's a small number of DMA chips, at various addresses. A collection of drivers for FDC and console I/O could also be offered in addition to parameterized I/O where the user...

I think it could be done for the popular UARTs of the time along with the port address settings, And polled 1771 FDC. That's enough to create a bootable system