[HN Gopher] Visible Lisp Computer: embedded real-time display of...
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Visible Lisp Computer: embedded real-time display of Lisp workspace
using uLisp
Author : Gollapalli
Score : 51 points
Date : 2022-03-09 10:01 UTC (13 hours ago)
(HTM) web link (www.technoblogy.com)
(TXT) w3m dump (www.technoblogy.com)
| nanomonkey wrote:
| I've been having a lot of fun building out, and playing with
| uLisp. I enjoy adding low level functionality in C, and then
| interacting with it at the uLisp REPL. Very satisfying.
|
| I really wish there were a handheld device like the Precursor, or
| Solder Party Keyboard Featherwing[0] that was available in a
| robust form factor, like a graphing calculator, or wedge
| keyboard. Ideally with a Teensy 4.1, or similarly spec'ed
| microcontroller. Bonus points for a LoRa module for
| messaging/mesh networking with other devices.
|
| [0]https://www.adafruit.com/product/4818
| johnsondavies wrote:
| How about the Lisp Badge?
|
| [0]http://www.technoblogy.com/show?2AEE
| nanomonkey wrote:
| Hey johnsondavies! Definitely lusting after this, is it
| available anywhere for purchase? If not, any interest in
| doing a group buy on pcbs and components?
|
| It would be nice if the display had more real estate, at
| least 80 characters wide ideally so that it could be used as
| a vt100 terminal.
| nablaone wrote:
| It reminds me running the code in video address space on Atari.
| exikyut wrote:
| Oh oh oh! You mean like _this_?
|
| http://www.oldskool.org/tales
|
| > _Fun with the Atari ST_
|
| > _Fred Butzen writes:_
|
| > _" Here's one of my stories. Not really old school, but it's
| funny._
|
| > _In the mid-80s, MWC wrote one of the first C compilers for
| the Atari ST -- the "Jackintosh", so called because Jack
| Tremiel (formerly of Commodore) designed it with Atari as a
| rip-off of the Macintosh. It had a GUI built around Digital
| Research's GEM interface. It had two floppies, a 68000 CPU, and
| 512 kilobytes of RAM -- which in those days was a lot of
| memory. To save money, the hardware was totally sleezy. From
| time to time it would simply stop working, and you'd have to
| open up the unit and reseat all of the chips in their sockets.
| If you were in a hurry, you'd just lift up the unit about six
| inches and drop it. A total piece of junk._
|
| > _Part of the savings was that the machine had no MMU and no
| parity on the memory. This meant that the machine was totally
| unreliable; however, it also meant that a kid hacker could do
| anything to the hardware, and there 's no way the machine would
| stop him. (Mind you, that anything included smoking the tube,
| but that's another story.) For example, I wrote a little
| program that reset the base address of video memory to zero,
| which was where the operating system lived. (Video used RAM, of
| course, rather than memory on a separate card.) It was kind of
| cool, because when you ran a program that allocated memory --
| say, a sort program, you could see the memory being allocated
| and deallocated on the screen. The difference between qsort and
| shellsort was really obvious just by the patterns they drew on
| the screen._
|
| > _Anyway, as a programming exercise I wrote a version of the
| game of life for this machine. It ran fine; however, I made one
| mistake: I forgot to set the clipping rectangle around the
| screen. So, the first time I built a glider gun, the glider
| went creeping off the screen, and just kept on going, crashing
| through memory. Mind you, there 's no MMU, so the machine is
| still running while the glider is rampaging through memory.
| Because the 68000 used memory-mapped ports for its hardware,
| you could see where the glider was going because the disk
| drives starting running, the lights flashed on the keyboard,
| the tube blinked, and so on. Finally, the glider hit something
| really vital and the machine died with "streaky bombs" -- a
| sign that the operating system was really, really sick._
|
| > _Of course, I had to show this to all the other guys. We
| laughed ourselves sick watching that happen. "_
|
| I have been wondering what those "streaky bombs" would have
| looked like for years!
| all2 wrote:
| Are there any videos/tutorials on this? This sounds like it
| would be super interesting to see.
| incanus77 wrote:
| I've been loving this guy's site for some time, particularly the
| sound & audio projects. And the tiny circuit photography is
| awesome!
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(page generated 2022-03-09 23:02 UTC)