Am 14.07.2015 um 19:44 schrieb pigi:
Il 14/07/2015 19:25, Bill Cunningham ha scritto:I am not quite sure if I have ask this, or something similar before. If so please forgive me. Is there a simh tutorial as an API ? There is simh_doc.doc but it is kind of limited in scope. If someone were interested in using the API as a simulator for a C128's 650x processor, how would they begin? If anyone has done anything like this.I have brought up the CBM computers before. Is there an API tutorial?sir, I must point to you that, AFAIK the CBM machines's peculiarities isn't easy to adapt to the general structure of SIMH, even with an graphic API for SIMH (a WIP, as I understand), and, OTOH, there's already a very fine and mature emulator/simulator for the CBM machines:
I don't see specific peculiarities of CBMs which would prevent writing a SIMH simulator for them. SIMH was originally tailored to minis that are composed of some CPU/RAM/MMU core (albeit distributed over several boards) that use some bus system to talk to more or less independent and/or intelligent subsystems. This is expressed by the datastructures of DEVICEs and UNITs. This is different from a microcomputer system where several closely interconnected peripheral chips are grouped around a central CPU chip. Thus, it is not directly obvious, what can be considered a device or unit, besides that some chips like a FD controller or a PIA/VIA (in case of a Commodore) require rather low level programming, and turn out quite complex.
There are already approaches for simulating micros in SIMH though, the Z80 family, the 6800 Flex system, or the 68k-SageII, so I'd see this just as quite some work to do, but no actual architectural problem in SIMH which would prevent it to implement.
A valid point ist of course that VICE ist already existing, and does a good job already for a lot of CBM software, so rewriting this in SIMH looks to me like a larger exercise, not really filling a gap.
-- Holger
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