> 2. boot routines should jam PS = 340, which is what is expected today. > > #2 is based on an examination of the official boot ROM listings. While > there may be paths through the boot ROMs that don't set PS = 340, the > primary path does that, and it is known to work with all the existing > boot ROMs in the simulator.
My memory is far from perfect, but I recall a problem with the DEQNA boot ROM (internal to the DEQNA, not external ROM) in which it did not set PS=340. As I recall, it loaded and then executed code in low memory (the vector area). If a clock tick occured before the boot code finished, it would dispatch to somewhere out in the weeds. This was from a project I did in 1982, so my memory of the details may be faulty. As I recall, we were using an LSI-11/23. If necessary, I can search for my notes on that project. Alan Frisbie -- This e-mail is a natural hand made product. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects. -- Alan E. Frisbie [email protected] -- Flying Disk Systems, Inc. _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
