Search found 65 matches

by Bean
Thu Jun 13, 2019 1:48 pm
Forum: Development
Topic: New hardware I/O board using Parallax Propeller (VGA,Sound,Joystick,etc)
Replies: 32
Views: 11776

Re: New hardware I/O board using Parallax Propeller

I've decided to put the 16K of RAM on my board also.
Can someone explain what I have to do so that it support true Hi-Res mode ?
And maybe why it needs to be done ?

Thanks,
Bean
by Bean
Thu Jun 13, 2019 2:56 am
Forum: Development
Topic: New hardware I/O board using Parallax Propeller (VGA,Sound,Joystick,etc)
Replies: 32
Views: 11776

Re: New hardware I/O board using Parallax Propeller

Tim, Thanks for the offer. I'd like to find a source for the proper connector because I would like to sell these as a kit. I'm using all thru-hole parts. If it is popular, I might redesign for surface mount parts and sell it already built. After I get the design finalized I'd like to send you one to...
by Bean
Wed Jun 12, 2019 9:05 pm
Forum: Development
Topic: New hardware I/O board using Parallax Propeller (VGA,Sound,Joystick,etc)
Replies: 32
Views: 11776

Re: New hardware I/O board using Parallax Propeller

It could make VGA or composite video, but it would be an independent screen (it would not be a copy of what is on the normal screen). This is because I don't have enough address lines to monitor that much memory (I only have access to 4 addresses). LIkewise, with the keyboard. It could support a PS/...
by Bean
Wed Jun 12, 2019 3:53 pm
Forum: Development
Topic: New hardware I/O board using Parallax Propeller (VGA,Sound,Joystick,etc)
Replies: 32
Views: 11776

Re: New hardware I/O board using Parallax Propeller

Hey Tim, Yeah I saw them, but they are "out of stock". I tried modifying a longer connector, but I made a mess of it. It's good enough to test with. I am really just wondering what connectors to put on the board, RCA, VGA, etc. I think it will also have a row of pin so you can connect a daughterboar...
by Bean
Wed Jun 12, 2019 12:23 am
Forum: Development
Topic: New hardware I/O board using Parallax Propeller (VGA,Sound,Joystick,etc)
Replies: 32
Views: 11776

New hardware I/O board using Parallax Propeller (VGA,Sound,Joystick,etc)

Hey guys, I'm working on a new hardware project. An I/O board for the ZX81 based on the Parallax Propeller. I want to keep it very simple and able to be made from all thru-hole parts. It's a very simple board with the propeller being fast enough to handle all the bus timing. Anyway, it currently is ...
by Bean
Thu Apr 18, 2019 6:01 pm
Forum: Hardware
Topic: NOOO.. My just arrived TS 1500 is flakey!
Replies: 10
Views: 2883

Re: NOOO.. My just arrived TS 1500 is flakey!

If you haven't sent it back yet. Try connecting a 16K RAM pack and see if it boots.
I have one that does that and it has bad RAM, and I just use it with a RAM pack attached.

Bean
by Bean
Thu Apr 26, 2018 2:17 pm
Forum: Development
Topic: Pretty fast Mandelbrot set generator...
Replies: 8
Views: 8157

Re: Pretty fast Mandelbrot set generator...

I have updated the mandelbrot drawing program.
I now use 4.12 fixed point math so you can zoom in further.
I also added a couple more features (print, set max depth, etc).

I think this is quite a good demonstration program for the good ol' zeddy.

Bean
by Bean
Mon Apr 23, 2018 7:06 pm
Forum: Development
Topic: Pretty fast Mandelbrot set generator...
Replies: 8
Views: 8157

Re: Pretty fast Mandelbrot set generator...

I noticed if you zoom in too much it just goes blank. I think the increment goes to zero.
I am using 8.8 fixed point math in the asm. I guess I could use 4.12 and get more zoom.

Bean
by Bean
Mon Apr 23, 2018 5:14 pm
Forum: Development
Topic: Pretty fast Mandelbrot set generator...
Replies: 8
Views: 8157

Pretty fast Mandelbrot set generator...

I wrote a program a play with the Mandelbrot set.
Uses ASM to draw the set and BASIC to handle the user interface.
Takes about 85 seconds in slow mode (NTSC) or about 16 seconds in fast mode.

Comments welcome...

Bean
by Bean
Wed Nov 22, 2017 1:29 am
Forum: GAMES
Topic: Moon Patrol
Replies: 33
Views: 29194

Re: Moon Patrol

Moggy,
I will make the characters different so the UDG can work better.
I'll use inverse periods for the top section, etc...

Bean