Search found 133 matches

by poglad
Mon May 12, 2014 11:42 am
Forum: Hardware
Topic: looking for someone in London to help me troubleshoot a ZX81
Replies: 22
Views: 4785

Re: looking for someone in London to help me troubleshoot a

Well, soon find out. I have other possible uses for it too, and it was dead cheap.
by poglad
Mon May 12, 2014 10:58 am
Forum: ZX BASIC
Topic: BASIC speed
Replies: 8
Views: 2703

Re: BASIC speed

I should add, obviously the value of FRAMES will eventually wrap around, which might give you a weird negative result if your program starts just before it wraps, and ends just after. You can either just run it again if you get that, or you could do a POKE 16437,255 at the start to make sure it's no...
by poglad
Mon May 12, 2014 10:45 am
Forum: ZX BASIC
Topic: BASIC speed
Replies: 8
Views: 2703

Re: BASIC speed

You can do almost the same thing, there's a system variable called FRAMES. The ZX81 manual is online, and I think there's even a timing example in there. EDIT: Okay, didn't see a timing example, but FRAMES is at 16436 and 16437. So you can say LET FRAMES=PEEK 16436+256*PEEK 16437. According to the m...
by poglad
Mon May 12, 2014 8:30 am
Forum: ZX BASIC
Topic: BASIC speed
Replies: 8
Views: 2703

Re: BASIC speed

Why don't you write a program to find out? ;)
by poglad
Mon May 12, 2014 1:18 am
Forum: Hardware
Topic: looking for someone in London to help me troubleshoot a ZX81
Replies: 22
Views: 4785

Re: looking for someone in London to help me troubleshoot a

Thanks gozzo - luckily it's my ZX80core I have it in mind for, and it has the CCB on board. 8-)
by poglad
Mon May 12, 2014 1:13 am
Forum: ZX BASIC
Topic: Another 1K wonder lol
Replies: 2
Views: 1652

Another 1K wonder lol

In the tradition of Shaun_B's 1K wonders, may I humbly offer the following! :lol:
by poglad
Mon May 12, 2014 12:30 am
Forum: Hardware
Topic: looking for someone in London to help me troubleshoot a ZX81
Replies: 22
Views: 4785

Re: looking for someone in London to help me troubleshoot a

Haha thanks. That EasyCap looks good. I've just ordered one - at that price I'm sure I'll find it useful for something!
by poglad
Mon May 12, 2014 12:27 am
Forum: ZX BASIC
Topic: Bouncing ball
Replies: 13
Views: 6717

Re: Bouncing ball

Oh, and SGN PI gives you 1 in 2 bytes also.
by poglad
Mon May 12, 2014 12:26 am
Forum: ZX BASIC
Topic: Bouncing ball
Replies: 13
Views: 6717

Re: Bouncing ball

Well your avoidance of GOTO has simply made it use more bytes really, as well as subverting the usual meaning of FOR. But anyway - one thing I remember from my 1K days is that NOT PI gives you zero in two bytes, whereas PI-PI takes 3 bytes. :D
by poglad
Sun May 11, 2014 8:58 pm
Forum: Development
Topic: ZX80 Core - new ZX80 motherboards
Replies: 259
Views: 79394

Re: ZX80 Core - new ZX80 motherboards

Starting to make some progress! :D