imitation game movie
elson at pico-systems.com
Wed Feb 11 23:37:06 CST 2015
On 02/11/2015 10:50 PM, Chuck Guzis wrote:
> On 02/11/2015 05:47 PM, Jon Elson wrote:
>> On 02/11/2015 01:22 PM, Chuck Guzis wrote:
>>> That was the Super Bee, right? 8008 CPU, but I thought
>>> the memory was
>>> MOS shift-register, not bucket-brigade (which I mostly
>>> associate with
>>> analog applications, such as reverb effects).
>> No, this predated the super bee. No CPU at all, just
>> about 75 TTL ICs,
>> the clock
>> drivers and the bucket brigade chips. And, yes, some
>> versions of them were
>> capable of analog signals, and used to make reverbs.
> Hmm, not familiar with that terminal. Was it like the IBM
> terminals (2250 IIRC?) that used delay lines for video
> memory (i.e. the delay line didn't drive a ROM character
> generator, but rather held the generated characters)?
No, the 2250 had all the "smarts" in the computer room, and
sent video down a wire to the
terminal. The terminal had a cheap Zenith TV set in the
housing, the tuner was still there,
as it was needed to complete the line-voltage heater string
which had to add up to 120
The original Beehive was a classic dumb serial terminal. I
think it had no screen addressing, just
scrolled text with line feed, CR and tab. The ASCII
character codes were held in the
serial memory, and the char gen ROM was fast enough to
convert on the fly, I think.
I should still have the drawings around here somewhere.
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