[Simh] Just a little bit of weirdness and extreme simh-ing

[Timothe Litt]

https://www.ijs.si/software/snprintf/

On 07-Dec-17 18:22, Jordi Guillaumes Pons wrote:
> This:
>
> [BITXOV]$ mcr pdp8
>
> PDP-8 simulator V4.0-0 Beta        git commit id: f1f8c855
> pdp8.ini-9> attach lpt printer.txt
> LPT: creating new file
> pdp8.ini-32> attach ttix 8888
> $JOBening on port 8888
>
> $MSG *** DEFINING LOGICALS ***
>
> WELCOME TO OS/8
>
> DEFINED LOGICALS:
>
> - FOCAL: RKA1: (FOCAL EXAMPLES AND BINARIES)
> - GAMES: RKB1: (BASIC GAMES)
> - DSK:   RKB0: (USER PARTITION)
> - SYS:   RKA0: (SYSTEM PARTITION)
>
>
> #END BATCH
>
> .DIR
>
>
>
> ISS   .DA   1           START .BK   1           MODUL .RL   2
> VECSUB.FT   2           BASIC .WS  21           VECSUB.LS   2
> VECMUL.FT   1           PASCAL.PA 364           VECSUB.RL   2
> VECINV.FT   1           ORB   .LD   9           VECINV.LS   2
> GRAVF .FT   2           HELPA .PS   1           VECINV.RL   2
> MODUL .FT   1           BUBBLE.PS   4           VECMUL.LS   2
> TEST  .BA   1           ORB   .LS   8           VECMUL.RL   2
> EARTH .DA   1           ORB   .RL   5           ORB   .MP   2
> ORB   .FT   7           GRAVF .LS   3           OUT   .LS 185
> RUNORB.BI   1           GRAVF .RL   2           START .BI   1
> INIT  .CM   1           MODUL .LS   2           MESSAG.TX   1
>
>   33 FILES IN  642 BLOCKS - 2599 FREE BLOCKS
>
> .COMPILE ORB,ORB<ORB.FT
>                              
> sim> show ver
> PDP-8 simulator V4.0-0 Beta
>     Simulator Framework Capabilities:
>         32b data
>         32b addresses
>         no Ethernet
>         Idle/Throttling support is available
>     Host Platform:
>         Compiler: DEC C V6.4-005
>         Simulator Compiled as C on Dec  7 2017 at 23:50:20
>         Memory Access: Little Endian
>         Memory Pointer Size: 32 bits
>         No Large File support
>         SDL Video support: No Video Support
>         No RegEx support for EXPECT commands
>         OS clock resolution: 10ms
>         Time taken by msleep(1): 10ms
>         OS: OpenVMS VAX V7.3
>         git commit id: f1f8c855       
>
>
> Yep, it’s OS/8 running on simh’ PDP-8  running on VAX/VMS 7.3 running
> on simh MicroVAX 3900 :) Slow as hell (the VAX is running on an ARM
> based SoC) but it works.
>
> Does it compile out of the box? I’m afraid not.
>
> Things I had to do to compile the PDP8 simulator:
>
> - Add /MACRO=“CC_DEFS=__VAX” to the MMS command line. It looks the
> CC_DEFS macro gets emptied somehow and then the compiler complains
> because it does not like /DEF=()
> - Hacked a fast and dirty version of snprintf (which simply ignores
> the “n” part), since that routine is not in the DECC RTL. Oh, those
> were the times. This is the routine:
>
> #include <stdio.h>
> #include <varargs.h>
>
> int snprintf (va_alist)
> va_dcl
> {
>     char *buffer;
>     int size;
>     char *format;
>     va_list p;
>     va_start(p);
>
>     buffer = va_arg(p, char*);
>     size = va_arg(p, int);
>     format = va_arg(p, char*);
>
>     return sprintf(buffer, format, p);
> }                            
>
> Compile it with the /DECC/NAMES=AS_IS qualifiers and insert it into
> the [.BIN.VMS.LIB]simh-nonet-.olb library and the compilation should
> end without problems. 
>
> And voilà! You’ll have a PDP-8 simulator running under a VAX simulator
> in your machine of choice.
>
> Or, you can also run it on real VAX hardware… :)
>
>
>
>
>
> _______________________________________________
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> Simh at trailing-edge.com
> http://mailman.trailing-edge.com/mailman/listinfo/simh

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