[Simh] need help with vax780 on linux

[Göran Åhling]

On 2011-07-24 06:25, Dan Gahlinger wrote:
> I got a DSK file from other user which works fine on their system,
> but when I try it on my linux system I just get errors, no matter how 
> I try to boot it.
>
> I don't know if this is a bug in SIMH on my linux (suse 11.3 64bit on 
> amd phenom-ii quad-core)
> or something I'm doing wrong, but the most recent error is the 2nd one,
> which seems to indicate a fatal bug in simh, this is in the latest 
> code version I could download of simh...
>
> sim> boot rq0
> Loading boot code from vmb.exe
> %BOOT-F-Unable to locate BOOT fil
> HALT instruction, PC: 000004C7 (BLBS 549,4C6)
> sim>
>
> tried it this way and got -
>
> sim> boot rq0
> Loading boot code from vmb.exe
>
>
>    VAX/VMS Version V4.2 24-JUN-1985 08:00
>
>
>
> **** FATAL BUG CHECK, VERSION = BJT  INVEXCEPTN, Exception while above 
> ASTDEL or on interrupt stack
>
>     CURRENT PROCESS = SWAPPER
>
>     REGISTER DUMP
>
>         R0 = 00000008
>         R1 = 04080000
>         R2 = 00000000
>         R3 = 00000000
>         R4 = 80002748
>         R5 = 00000000
>         R6 = 00000000
>         R7 = 00000000
>         R8 = 00000000
>         R9 = 00000000
>         R10= 00000000
>         R11= 00000000
>         AP = 00000000
>         FP = 00000000
>         SP = 806DF3D0
>         PC = 80004862
>         PSL= 04080009
>
>     KERNEL/INTERRUPT STACK
>
>         806DF3D8  00000004
>         806DF3DC  00000000
>         806DF3E0  FFFFFFFD
>         806DF3E4  00000000
>         806DF3E8  00000000
>         806DF3EC  00000001
>         806DF3F0  00000003
>         806DF3F4  00000454
>         806DF3F8  8000A71B
>         806DF3FC  04080000
>
> Reboot requested, PC: 8063A59E (HALT)
> sim> quit
>
>
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Just some thoughts that fly by in reading you post:
 From the mailed .INI-file, the commands set up rq0 as a CD with an 
attached .ISO-file.
Then you try to boot from this "CD".

Q1: Should the 780-emulator be able to recognize a CD as a device? - In 
those days the TU58 was "the media" for console works...
Q2: If this booting is proper after all, and the file you have attached 
to the rq0 is the boot-disc you intend to use, should it really be 
attached to a "read-only" device like a CD, not to a disc? - I know 
later systems can boot from a CD, but doesn't that require booting a 
system image that is tailored to this task - i.e. that doesn't require 
any dump-files or similar?

(You say that the emulator reads your .DSK properly, but to my eyes does 
it only read the file vms6_0.iso, ie the CD-immage).

All my best anyhow - every effort to maintain this generation of systems 
indicates a great spirit!
/Göran
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