IBM 1620 Simulation
cclist at sydex.com
Thu Aug 26 20:46:08 CDT 2021
On 8/26/21 5:14 PM, Ray Jewhurst via cctalk wrote:
> Hello all,
> Long time lurker, extremely rare poster, I was reading the Wikipedia
> article on the IBM 1620 and became quite intrigued. I know that there is a
> simulator for it on SimH but I have never ran or simulated any card-driven
> machines before. I have all the documentation and the ibm1620.zip file
> from bitsavers but I am not sure what to do next. I know I would like to
> try Monitor, Fortran-II and possibly GOTRAN but I have so many questions.
> I read the SimH documentation which gave me some understanding but I don't
> know exactly how the card decks work, how to install Monitor or how to boot
> Monitor once it is installed since I know you have to boot off a deck. My
> final question is, is there an easy to use card-driven machine to cut my
> teeth on? Also, any anecdotes on any of the old IBM computers would be
> both welcome and greatly appreciated.
Cards are just ASCII lines separated by newlines>
For more information, see:
It's been years since I used the SIMH 1620 simulator, so I can't even
claim to be remotely current. I used it to check out some sample code
My reaction: It's just not the same. I guess you had to be there.
Did anyone manage to snag a copy of Monitor IID? Or is the only extant
version Monitor I? The differences were significant.
Also, don't forget SPS!
If you're new to the 1620, I recommend the following book:
If you want to use a totally (i.e. no disk) card-driven version of the
1620, I'd recommend that you start with simple machine language
programs. I (dimly) recall that using the card-only FORTRAN compiler
was a bit of a chore: read pass 1, read your program, while punching an
intermediate deck, read pass 2 and the intermediate deck, read the
subroutine library and wind up with an executable deck.
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