Hi Glen, Yes, and I have looked over it several times. It does have quite a bit of info, but it doesn't go into much detail for the R/W register. I also found a student guide that includes the BDV11 and it help shed some light on how the code in the ROMs is segmented. It helped me visualize more how it is done. But I am still missing things like the details for the R/W register.
https://wwcm.synology.me/pdf/EY-DX056-SP-002&J6269-A&EY-DX052-SG-002%20Small%20Systems%20Training%20PDP-11V23-&%2011T23%20System%20Maintenance%20Student%20Guide.pdf - Peter On Sun, Nov 23, 2025 at 10:52 AM Glen Slick via cctalk < [email protected]> wrote: > On Sun, Nov 23, 2025, 6:32 AM Peter Ekstrom via cctalk < > [email protected]> wrote: > > > Does anyone know if there is any programming information about the BDV11 > > card? > > I have disassembled the ROM files for it and I see they do various > > operations with the > > registers on the card, but it is not clear to me exactly what they are > > doing. > > > > - Peter > > > > Did you already find this? > > http://www.bitsavers.org/pdf/dec/qbus/EK-BDV11-TM-001_Mar78.pdf > > > >
