Re:System Bus Radio: Transmits AM radio on computers without...
by mark-r on Wednesday January 17, 2018 @09:28AM
(#16168087)
I saw it done in the 1970s on a PDP-8 at the University of Minnesota. It wasn't just a couple of tones, it was playing complete songs. Later on a Z80 micro. Computers really emitted a lot of RF back then!
[ Parent
| on HN ]
Re:System Bus Radio: Transmits AM radio on computers without...
by uhny-uftz on Wednesday January 17, 2018 @04:54PM
(#16172357)
When I was a kid in the early 80's, I couldn't use my TRS-80 Model I during prime time TV hours. The main TV antenna for the house was located in the attic above my room. When I turned on my computer, the interference would essentially wipe out the VHF-Lo channels. Sometimes I would forget until I heard my parents yelling from across the house. Ah... good times...
Re:System Bus Radio: Transmits AM radio on computers without...
by braythwayt on Wednesday January 17, 2018 @09:30AM
(#16168104)
For good tones, you had to get down close to "the metal." I recall that there were a few programs like this, but I believe they were written in assembler or machine language so as to control the cpu and bus directly.
Re:System Bus Radio: Transmits AM radio on computers without...
by mark-r on Wednesday January 17, 2018 @09:45AM
(#16168222)
Back then most programming for those machines was done at that level!
Re:System Bus Radio: Transmits AM radio on computers without...
by braythwayt on Wednesday January 17, 2018 @09:52AM
(#16168289)
When I first laid eyes on the "High Speed Job Stream" in UofT's Sanford Fleming building (that particular building has since burnt down and been replaced), students were running jobs in PL/1, WATFIV, LISP, SPITBOL, COBOL, and many others.
In the labs, there were IBM Selectric terminals dedicated to APL.
And there was a BASIC dialect over at what was then "Ryerson Polytechnic." There was a room with terminals and acoustic couplers, no security to keep you out.
You need a username and password to use the terminals, but the username and password for each class was posted on a corkboard, so you would write your own programs as long as you didn't get in the way of actual students trying to finish their assignments.
I don't doubt that "most" programming was done in assembler, but there was no shortage of higher-level programming going on.
Re:System Bus Radio: Transmits AM radio on computers without...
by mark-r on Wednesday January 17, 2018 @10:49AM
(#16168832)
I said most programming for those particular machines. I agree that mainframes had largely moved on, and probably the larger minis too. My first exposure to programming was time-shared Basic in 1972.
Re:System Bus Radio: Transmits AM radio on computers without...
by braythwayt on Wednesday January 17, 2018 @01:56PM
(#16170635)
You know, I think we've somehow fallen into _violent agreement_ on all subjects.