[Simh] DECsys-7 on SimH [was Re: new paper on history of Unix]

Rich Alderson simh at alderson.users.panix.com
Fri Aug 20 20:37:36 EDT 2010


> Date: Fri, 20 Aug 2010 21:53:13 +0200
> From: "dott.Piergiorgio" <dott.piergiorgio at fastwebnet.it>

> after looking at PDP-7 DECSYS (aside that seems that can't works on SIMH
> because of the DECTape track mark issue)

Have you tried it?  I just did, following Bob's instructions in the doc.txt
file included in decsys.zip on the SimH software page.  See below.

Remember that the DECtape images used by SimH are data-only, and assume
standard format tapes (578 blocks of 256 18- or 16-bit words or 128 36-bit
words, or 1100 blocks of 129 12-bit words).  The difference between a PDP-7
DECtape and other systems' is in the overhead frames, not in the data.

(As it happens, Prof. Harlan Lefevre was here at the museum last week, to
 give us a hand with the PDP-7.  Bob's notes, written in 2006, mention that
 we would be putting the system on-line "soon"; 4 years isn't that bad.)

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Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\richa>d:

D:\>cd Simulation Images\PDP-1-4-7-9-15\DECsys-7

D:\Simulation Images\PDP-1-4-7-9-15\DECsys-7>dir
 Volume in drive D is Data Drive
 Volume Serial Number is 28A6-F816

 Directory of D:\Simulation Images\PDP-1-4-7-9-15\DECsys-7

08/20/2010  05:10 PM    <DIR>          .
08/20/2010  05:10 PM    <DIR>          ..
08/20/2010  05:11 PM           393,220 decsys.dtp
06/12/2006  01:54 PM               353 decsys.rim
06/20/2006  06:34 PM             3,066 decsys_doc.txt
08/20/2010  05:10 PM                 0 scratch.dtp
               4 File(s)        396,639 bytes
               2 Dir(s)  335,543,263,232 bytes free

D:\Simulation Images\PDP-1-4-7-9-15\DECsys-7>pdp7

PDP-7 simulator V3.8-1
sim> show conf
PDP-7 simulator configuration

CPU, idle disabled, 32KW, EAE
CLK, 60Hz, devno=00
PTR, devno=01, not attached
PTP, devno=02, not attached
TTI, devno=03, KSR, half duplex
TTO, devno=04, KSR
LPT, devno=65-66, not attached
DRM, devno=60-62, 131KW, not attached
DT, devno=75-76, 8 units
  DT0, 147KW, not attached, write enabled, 18b
  DT1, 147KW, not attached, write enabled, 18b
  DT2, 147KW, not attached, write enabled, 18b
  DT3, 147KW, not attached, write enabled, 18b
  DT4, 147KW, not attached, write enabled, 18b
  DT5, 147KW, not attached, write enabled, 18b
  DT6, 147KW, not attached, write enabled, 18b
  DT7, 147KW, not attached, write enabled, 18b
sim> att dt2 decsys.dtp
DT2: 18b/36b format, buffering file in memory
sim> att dt3 scratch.dtp
DT3: 18b/36b format, buffering file in memory
sim> load decsys.rim 17640
sim> run

GA
CONTEN!
INDICATE REQUIRED FILES (S,L,W)
S,L,W!
CAB DECSYS7 COPY   15 JUNE 1966
CONTEN S 0007
LABEL S 0009
COMPIL S 0010
ASSEMB S 0011
LOAD S 0012
LOADER S 0013
FOROTS S 0023
FASSMB S 0035
FORTRN S 0047
UPDATE S 0067
EDIT S 0076
NARITH, L 0092
EARITH, L 0094
SARITH, L 0096
.IO1, L 0097
.IO2, L 0099
.IO3, L 0101
.IO4, L 0103
.IODEC, L 0105
.IO8, L 0113
.IO5, L 0115
.IO6, L 0117
.IO7, L 0118
.IO57A, L 0120
NINDIG, L 0126
SQRTF., L 0127
XPN, L 0128
EXP, L 0129
EXPF., L 0130
LOGF., L 0133
CLOGF., L 0134
LOGCOM, L 0135
SINF.,COSF., L 0136
ATANF., L 0139
ABSF., L 0141
XABSF., L 0142
GA

Simulation stopped, PC: 16347 (KSF)
sim> exit
Goodbye
DT2: writing buffer to file

D:\Simulation Images\PDP-1-4-7-9-15\DECsys-7>

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