I think it is random as an unmodified M500 works fine on this Master. Perhaps it was problematic due to a change in the source of the 1MHz clock on the 1MHz bus? The B+ has a more complicated cycle stretching circuit, I guess the Master has that wad of TTL incorporated inside one of its ULAs? I'm thinking timing problem...While at last weekend's ABUG my MUSIC 500 was tested on both a BBC and Master - worked on both. The mod I fitted, for the Master, was just the resistor version. I'm thinking that the resistor value and the TTL pin capacitance gives just enough delay to allow working on the Master!Also, has this been modded for Master use? Double check the correct R/C values have been used.
Dave
Just a thought!
Dave H.
Statistics: Posted by maniacminer — Wed Apr 17, 2024 11:03 pm