[Coco] What was used before EDTASM+?

[gene heskett]

On 8/3/22 19:10, Richard Goedeken via Coco wrote:
> It's interesting that there is some cross-pollination between the Coco 
> and 1802 communities.  I have been on an 1802 mailing list for a few 
> years and there is a lot of activity there.
>
> A few years ago I ported Scott Adams' "Adventureland" game to the 1802 
> and got it running on that 1802 Membership Card.  Lee has the ROM 
> available on the link you included. He has a new version of the 
> front-panel board with 7-segment displays on it which looks really 
> cool, but at the expense of the serial/parallel connector.
>
> Richard
>
It might also be interesting that the 1802, being cmos, happily runs 
well in a very high
alpha radiation environment, Its cmos also means power is consumed only 
during a clock
transition, which translated to the computers on the space shuttle being 
1802 based long
after we had gone on to faster stuff. That one used at KRCR, did a lot, 
triggered at every vertical
sync pulse start, so I put a flag byte I could watch with a scope to see 
just how long it took
to do all its thing and arrive back at the I'm done stop point, which 
was in the middle of the
sync pulse for line 21. or 1.335 milliseconds, quite a bit faster than 
my estimates at the time.
And because I wrote that in self modifying code, that included 
re-initializing all the stuff I had
modified in order to reuse existing code. And it was dead stable. No 
crashes. It was only
later when I saw others denigrating the technique. It did require 
keeping copious notes
though. I still think its a valuable, space saving technique and it sure 
was useful in the
days when 4k of static ram went for $400 in kit form. You need to 
remember that the
only non-volatile storage it had access to was a broadcast audio cart 
machine, recording
beeps and such on an audio cart. I still have a paper copy of that as a 
hex dump, and an
audio cart with several copies of that program on it, in a ziploc bag on 
the top shelf of
my library here in the coyote den. The port 6309 in my web page address 
is a peon to the
hd6309 hitachi cpu , and the coyote.den in my local domain name, is 
credit to the smartest
canid, aka dog, a coyote bitch that could not speak English but she sure 
understood it.

Well enough she would bark the number of times the answer to an addition 
of 2 single
digit numbers gave.

A truly intelligent animal. I've met another canine that smart in the 50 
years since.

> On 8/2/22 19:53, John Guin via Coco wrote:
>> Gene,
>>
>> You mentioned the 1802 in one of these replies.  This modern kit 
>> computer uses an 1802 to re-create the COSMAC Elf - a Popular 
>> Electronics build from the 70s.
>>
>> Link http://www.sunrise-ev.com/1802.htm
>>
>> Currently making the rounds - IIRC, this bubbled up on Hacker News 
>> recently.
>>
>> Enjoy!
>> John
>>
>


Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
  soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
  - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>