Johnny Billquist wrote: > The fourth option is to treat this as a normal write. Essentially, > unless I remember wrong, that is pretty much the end result on real > hardware.
Agreed. If SIMH was updated to do this, I think SALV would be 99% happy. > I've played with a few disks back in the day that could write the > headers as well as read them, but there were no ability to store > arbitrary data there, so what would be returned on a read headers > could be computed when needed. I'm using the term "key field" as documented here: http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-RP04-MM-001%20RP04%20Device%20Control%20Logic%20Maintenance%20Manual.pdf See e.g. page 2-37. The header consists of five 16-bit words: cylinder and format, sector and track, key field #1, key field #2, and CRC. The key fields are arbitrary data under software control. I don't know if this applies to the RP06. SALV does write information to the key fields, but it seems the data isn't very important. _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
