3270 controller simulation

On Mon, Nov 18, 2019 at 5:50 PM Al Kossow via cctalk <cctalk at classiccmp.org> wrote: I have all the code. Among other places it's in VMS saveset files on one of my Linux laptops I use for project hacking. We licensed an existing product and rewrote it extensively for part of the application code to run on a COMBOARD (MC68000, 128K/512K local RAM, COM5025 USART, DMA interface to Unibus/Qbus) and the other part on the VAX, with a lot of shared memory blocks to split the work across both CPUs (the DMA engine mapped the entire Qbus/Unibus space into 68000 space so on the COMBOARD you could treat VAX memory like local memory but it was just slower). The actual technique could be illuminating to examine, but to run the code in its present form would require our custom front-end board. I do remember that it was a multi-person-multi-year effort to get that complicated wad of code working split across the bus. 99% of my coding work there was with the Bisync products so I am not the foremost authority on our SNA product. I had to handle support calls but I never fixed bugs on it. -ethan