Mark Matlock mark at
Mon Mar 30 13:37:57 CDT 2020

Date: Mon, 30 Mar 2020 10:58:46 -0400
> From: Bill Gunshannon <bill.gunshannon at <mailto:bill.gunshannon at>>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> 	<cctalk at <mailto:cctalk at>>
> Subject: APL-11
> Message-ID:
> 	<MWHPR22MB0878D888143DFB8F78B81AE2EDCB0 at <mailto:MWHPR22MB0878D888143DFB8F78B81AE2EDCB0 at>>
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> Haven't given up on DIBOL.  May try installing the RT-11 version and
> see if it runs.
> But now another language of interest has reared its ugly head.  :-)
> Anybody have an image of the tape for APL-11?  Manual claims it
> runs on all of the PDP-11 OSes and it is another language from
> my past that I haven't touched (other than to read some programs
> out of curiosity) in more than two decades.

    I have the APL-11 V2.1 source files on a RL02 disk image. I will make it available at <>

    Once you mount the disk image with Simh, the are two ready to run task images that will run under RSX11M or M+
In [201,200]APL6OK.TSK and APL7OK.TSK that are the REAL*4 and REAL*8 versions of APL-11. On the disk are the
Original .MAC sources as well as files from a RSX SIG tape that modified APL-11 for I/D under RSX11M+ that increased
The workspace (.BXWA from ~30000 to ~60000 bytes). It also contains a character set for Vt220 for the APL character set.

   When you install the APL task experiment with the /INC to maximize the available workspace, On my system, I can
INS APL6.TSK/INC=37000 to max the workspace for the single precision version.

   Also, the scanned APL-11 reference manual can be downloaded at <>
 and the APL11 installation guide at <>

   The RSX SIG files that have the info to change APL-11 to an I/D RSX11M+ task are at [370,360] on the RL02 disk. I remember having this work back in the mid-1980s butI have not been able to get it to work today. If I link it with ODT it seems to blow up when the first overlay is loaded. If anyone could help with that I’d really appreciate it!


> I have the source to something called APL-11 for Unix but it is
> not the same thing.  Actually, not even close.  :-)
> Would love to see a few pointers.
> Oh, and in case anyone is curious about my endeavors....
> The SIMH system I am  using now is based on the 11/70 and was built
> with only 2M of memory.  Why you would do that under SIMH where there
> is really no memory constraint at all, I can not fathom.  I used to
> have a bunch of 11/44's and that has been my favorite since my original
> 11/24 system died long, long ago./  I am going to configure a SIMH
> System using the 11/44 as my model and then reinstall everything in
> order to have a really good system for playing with this stuff.
> Sure wish there was a way to find some of the third party stuff from
> the sourcebooks.  A lot of nice software that should have been saved
> for historical reasons, if nothing else, has been lost.
> bill

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