I'd like a copy of the SDK-85 ROM also.
Those using an SDK-85 should be aware that there are at least two different released monitor ROM versions, versions 1.2 and 2.1. The RAM usage of the two is different! I wrote a program based on the manual for one ROM version, and discovered that it wouldn't work on the other, because the interrupts are vectored through different RAM locations. In the later version, the vectors were moved to addresses six bytes lower than in the earlier version, apparently to make an additional six bytes of stack space available.