Search found 69 matches

by Vorticon
Sat Jan 21, 2023 2:15 pm
Forum: Development
Topic: ZX81 Toddy Forth-79
Replies: 41
Views: 12914

Re: ZX81 Toddy Forth-79

Awesome thank you. I wrote a port of Jet Pac (Spectrum) for the TI 99/4A in TurboForth a few years ago ( https://youtu.be/HZZ2pu5BrF4 ) and I was really impressed by the capabilities of Forth, so I'm hoping to develop something for the Zeddy in Forth as well.
by Vorticon
Mon Jan 16, 2023 4:42 pm
Forum: Development
Topic: ZX81 Toddy Forth-79
Replies: 41
Views: 12914

Re: ZX81 Toddy Forth-79

How large of a program can Toddy Forth-79 handle?
by Vorticon
Sun Oct 23, 2022 12:40 pm
Forum: Hardware
Topic: Filesixty Keyboard
Replies: 19
Views: 4390

Re: Filesixty Keyboard

How well did these work?
by Vorticon
Sat Jul 23, 2022 6:07 pm
Forum: Software
Topic: Golden ratio
Replies: 0
Views: 1128

Golden ratio

I was reading an article about the Golden Ratio (1.618...) and its relationship to the Fibonacci sequence (it's the limit of the ratio of each successive pairs of numbers in the sequence), so I wrote this little tidbit in Basic showing the quick convergence to the Golden Ratio. Can you tell I was bo...
by Vorticon
Mon Jul 18, 2022 1:13 pm
Forum: FAQs
Topic: Exclamation point?
Replies: 18
Views: 15143

Re: Exclamation point?

Paul wrote: Wed Jul 13, 2022 10:03 am Maybe it's better to erase the exclamation mark from ASCII and newer because then we would have less shouting in messengers and forums. :mrgreen:
Excellent point (please note that I refrained from using an exclamation point here despite my vigorous agreement).
by Vorticon
Sun Jul 10, 2022 1:09 pm
Forum: Sinclair Misc
Topic: Why time ran out for Timex’s home computer [ZX81/TS1000]
Replies: 3
Views: 1970

Re: Why time ran out for Timex’s home computer [ZX81/TS1000]

Interesting, but frankly there was no way the TS1000 was going to survive when TI and Commodore were selling the 99/4A and VIC 20 respectively at close to $100 by 1984 (TI was out of the business by then but there was still lots of inventory around). To be honest, the Zeddy was not an easy computer ...
by Vorticon
Wed Jul 06, 2022 12:53 pm
Forum: Hardware
Topic: BackBit Pro cartridge
Replies: 1
Views: 1111

BackBit Pro cartridge

Has anyone used this? It's a multi-system SD-based cartridge that apparently also works on the ZX-81. It's load only and includes the 16K RAM expansion.

https://store.backbit.io/product/backbit-pro/
https://www.youtube.com/c/EviesRevue
by Vorticon
Sat Jul 02, 2022 2:22 am
Forum: Software
Topic: [Zx81:Type-Ins] "SyncWare News" campaign...
Replies: 22
Views: 5154

Re: [Zx81:Type-Ins] "SyncWare News" campaign...

XavSnap wrote: Thu Jun 30, 2022 1:03 am "Audio Frequency Counter Program for the Timex/Sinclair ZX81 "

By Milazzo, Carol F.

Syncware News, Vol 3:1, September-October 1985.
Very interesting!
Has anyone done a music visualizer on the Zeddy by any chance?
by Vorticon
Sat Jun 18, 2022 1:22 pm
Forum: Sinclair Misc
Topic: Interesting leaflets found as bookmarks in Zeddy manuals
Replies: 3
Views: 1576

Re: Interesting leaflets found as bookmarks in Zeddy manuals

I would have bought that car back in the day :)
by Vorticon
Tue Jun 14, 2022 9:39 pm
Forum: Software
Topic: Pascal for ZX81
Replies: 71
Views: 20599

Re: Pascal for ZX81

Here's an RND routine which will give you a pseudo-random number sequence. Feed it N, the maximum number in the sequence you want up to 4096 and it will return an integer in N between 0 and N-1. For example, N:=RND(10) will return a random number between 0 and 9 stored in N. Make sure you do not ove...