Fortran II Hypersource

79 pointsposted a year ago
by texdraft
(texdraft.github.io)

8 Comments

fsckboy

a year ago

you buried the lede in the lead, where it links:

See also LISP 1.5

https://texdraft.github.io/lisp-1.5/listing.html

finally! being able to take the actual CAR and CDR!

aap_

a year ago

CAR here and CDR just below: https://texdraft.github.io/lisp-1.5/listing.html#line-7626

nyrikki

a year ago

For those not familiar with these old IBM machines that used decrementing of the index registers, this will help explain all the ??D instructions are there.

https://bitsavers.org/pdf/ibm/704/24-6661-2_704_Manual_1955....

Another lens for the FORTRAN case specifically, in the modern way we tend to say Fortran arrays are 'one' indexed, looking at this old code it is sometimes useful of thinking of it as a limit index, pulling from n-1 -> n. Or at least I found that useful for myself when digging into some of this a long time ago.

fsckboy

a year ago

thanks for finding that, i love it!