And speaking of ALGOL

Nigel Williams nw at
Wed Aug 12 12:39:49 CDT 2015

> On 12 Aug 2015, at 11:24 pm, Paul Koning <paulkoning at> wrote:
>> On Aug 11, 2015, at 10:23 PM, Mark Kahrs <mark.kahrs at> wrote:
>> For those of you who might be interested, I sent a listing of the B6700
>> ALGOL compiler source code to the CHM.
>   I did find a copy of the B6500 ESPOL compiler online recently.

In the B5500 emulator repo:

It is still to be proofed though.
>> I'm surprised no one has mentioned the Burroughs extensions to ALGOL to
>> optimise|ize the use of the native string instructions.
> Did Algol come after the hardware?  I always thought of the hardware as having been customized for their Algol, but admittedly I don’t actually know which is chicken and which is egg.

It is suggested in the oral history at that the B5000 was designed as an ALGOL machine and Burroughs had the idea that only compilers would generate machine code, so they made the B5000 compiler friendly, and the system would have an OS to manage resources, so it was designed around drum/disk being an intrinsic part of the system.

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