On 2/18/16 12:27 AM, Bill Horne wrote:
Bill, who thinks that loading FOCAL from paper tape is the true test
of computer wizardry!
I never used FOCAL, but I frequently loaded EDU20 from paper tape. EDU20
was the version of DEC's PDP-8 multi-user BASIC that ran without a mass
storage device. It could output only to an ASR-33 tty or a high speed
paper tape punch, but it fit in 12K 12-bit words! My first task when I
started working for DEC was adding enhancements to EDU20 and EDU25.
EDU25 was the version of the code that supported DECtape and disk.
I've always felt that the true test of computer wizardry is figuring out
what the following code does and how it does it. In the first week or
so after I started at DEC, my officemate gave me this code as a challenge:
0004 TAD 5
0005 DCA I 10
0006 JMP 4
0007 ISZ 10
0010 10
So, all you PDP-8 programmers out there (all 2 of you), put on your
thinking caps!
Mark Rosenthal
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