On Sat, Feb 19, 2011 at 10:29:42AM -0400, Walter Knopf wrote:
> The byte size instructions and addresses were expressed in octal, so the
> eight bit RST7 was 377 as compared to FF in hex.
I guess you'd have to have a special instruction lookup table where they
were all converted to three bytes instead of the usual two (e.g.,
something like 'FD21word' would become '176441word'.) Jeez, I can't
imagine the torture. :)
> This was the early 8080 from Intel as used on the Altair computer. Intel
> later switched to hex.
I started with the 8080/8080A myself - everyone did, in the mid-to-late
70s, unless they were working with minis or mainframes.
By the time I could actually afford an 8080 and got around to wiring it
up, Netronics was selling their Cosmac ELF (which I also ended up
building - but I had to go sign up at a vocational school for their
brand-new "Digital Machines" course so I could get my hands on it!
[laugh] I could have taught that class in my sleep...) The microcomputer
world was (almost) up and running by that point; IBM sold their first PC
a year or two later.
My God. I just realized that I'm getting old. :)))
Ben
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