SIMH LGP-30 Progress.

On Wed, 11 Feb 2015, B Degnan wrote: Only if your drum memory loses its contents. I don't know if SIMH has a concept of non-volatile main storage (drum, core). And for the LGP-30, all registers are non-volatile, too. That's mine, but there's an English version, too. Urks, that's sick... but SIMH should offer the possibility to enter the mnemonics and addresses (or anything else since everything is mapped to its four bit code) like sim> d -a 3w00 p0000 (or d -a 6300 p0000 sim> d -a 3w04 i0000 d -a 6301 i0000 ...) sim> d -a 3w08 c3w14 sim> d -a 3w0j p0000 sim> d -a 3w10 i0000 sim> g 3w00 Anyways, SIMH is not very well suited for machines like an LGP-30 where the user interaction with typewriter and console buttons for operation is imperative. The SIMH version does officially work, but it is not really user friendly in this case. But the best would be if you use a drum image with 10.4 (the monitor) already loaded, i.e. save the memory contents to a file and reload it on the next incarnation of SIMH (there's a "START" drum containing 10.4 in my simulator package, and an "ACT5" drum with preloaded ACT-V and subroutines, these may be usable in SIMH, but I don't know). By using a simulator that offers the right frontend to the user (i.e. keys and buttons as required by the machine operations) *g* Christian