[Simh] SIMH and LGP-30
B Degnan
billdeg at buzz1.com
Mon Feb 9 15:00:04 EST 2015
Hi,
While there is some chatter on the teletype, I thought I'd ask my first
question.
I have been able to get a number of the SIMH emulators to work and I am
simply thrilled about the experience.
Looking for a challenge I worked for about 5 hours last night on the SIMH
for LGP-30....I can talk to the box a little but I was having a little
trouble reproducing the Flexowriter operations for loading in programs
manually via Flexowriter keyboard. Can anyone help point me in the right
direction. Here is a little of what I did, below...
SET CPU LGP30
I am working through the LGP-30 "Programming Class" manual and they say
things like:
Depress "manual input" --> which I believe is: SET CPU MANUAL then D A
value (what value?)
Type C3838 (C5614) on keyboard --> I need to use: SET CPU INPUT=TTI but
what to enter the value?
Depress "Fill instruction" button --> I believe this is accomplshe by SET
CPU FILL (fills IR from A)
Type 000B31K4 (B4953) on keyboard ----> How ??? using various combinations
of D A + value. I am wondering about the use of the ' character such as
with
Depress "one operation" button ----> ??
Depress "execute instruction" button ---> SET CPU EXEC = value (assuming
knows correct IR?)
B4953 should be in 5614 by entering everything in decimal form.
If I example 5614 the system returns all zeros, so whatever I was doing did
not work.
I played around a lot with D A command combinations and I was able to get
the simulator to respond to a point so I know the thing will work once I
learn the secrets. (I.e. from the manual) sim> d -n 64 10640
sim> ex -mn 64 64: B 400 sim> ex -mt 100 0100: B 0616
Can anyone share more manual input testing and program execution tips?
Nothing fancy just something simple so I can start writing and running
little programs. I figure then I could punch my own tapes and run them. I
also understand in principle about the role drum memory, but I may not be
applying this understanding to programming. I also assume the bootstrap is
not in memory already.
I looked over
https://github.com/simh/simh/blob/5551a0dd9c0e9e3161ba974c1665c09380381a1b/L
GP/lgp_cpu.c
and I read about the DOS-based simulator, but I prefer to use SIMH
Best,
Bill Degnan
Landenberg, PA
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.trailing-edge.com/pipermail/simh/attachments/20150209/c80b1e26/attachment.html>
More information about the Simh
mailing list