Search found 2597 matches

by sirmorris
Thu Oct 19, 2017 8:11 am
Forum: Hardware
Topic: ADDRESSING RAM AT 16K+
Replies: 11
Views: 154

Re: ADDRESSING RAM AT 16K+

On a simply expanded zeddy only the CPU drives the address lines. It doesn't _have_ to be that way but that's how it is.
by sirmorris
Wed Oct 18, 2017 11:26 am
Forum: Hardware
Topic: ADDRESSING RAM AT 16K+
Replies: 11
Views: 154

Re: ADDRESSING RAM AT 16K+

That's the best explanation I've seen Mark :ugeek:
by sirmorris
Sun Oct 15, 2017 1:46 pm
Forum: ZX BASIC
Topic: Loading/Editing/Saving .p files..?
Replies: 16
Views: 203

Re: Loading/Editing/Saving .p files..?

There is a kind-of standard that can be used to put the gfx chars into the text editor. It uses sequences of 2 characters that (somewhat vaguely) represent the quarter square graphics. See at the bottom of this page . Something like this: PRINT "%H%I% %T%H%E%R%E" will print HI THERE in inverse text....
by sirmorris
Sat Oct 14, 2017 8:36 pm
Forum: ZX BASIC
Topic: Loading/Editing/Saving .p files..?
Replies: 16
Views: 203

Re: Loading/Editing/Saving .p files..?

Coggie wrote:
Sat Oct 14, 2017 7:44 pm
I tried looking for a Python Plug-in for Notepad++ that could open&convert .p files to txt but alas...didn't find one... :(
There is a program called zxtool that can convert p to txt. I think ZX-IDE can do it too but I've never tried. ZXtool is here
by sirmorris
Sat Oct 14, 2017 8:34 pm
Forum: ZX BASIC
Topic: Loading/Editing/Saving .p files..?
Replies: 16
Views: 203

Re: Loading/Editing/Saving .p files..?

One statement per line I'm afraid bud. None of that fancy modern stuff here :lol:
by sirmorris
Sat Oct 14, 2017 1:27 pm
Forum: Emulators
Topic: ZEsarUX beta 5.1
Replies: 8
Views: 380

Re: ZEsarUX beta 5.1

Any IO address with a zero in bits 0..2 is not usable on a real ZX81. This is because the bottom 3 bits of IO operations are not decoded and used as ULA control signals. I don't know what effect this may have in an emulator.

http://problemkaputt.de/zxdocs.htm#zx80zx81ioports
by sirmorris
Sat Oct 14, 2017 12:00 pm
Forum: ZX BASIC
Topic: Loading/Editing/Saving .p files..?
Replies: 16
Views: 203

Re: Loading/Editing/Saving .p files..?

There is ZX-Ide which is aimed at machine code programming but it has the ability to assist with BASIC too. Spend a little time learning it and you can do some cool stuff like fire up your program into EightyOne or a real ZX81. Another way is to edit your BASIC program in notepad or whatever and the...
by sirmorris
Fri Oct 13, 2017 10:49 am
Forum: Hardware
Topic: What is the going price to have EPROMs burnt?
Replies: 17
Views: 220

Re: What is the going price to have EPROMs burnt?

Some types command higher prices due to their rarity and/or difficulty of programming. The TI 25xx series for example. You often need a more specialist programmer (read: expensive) for these.
by sirmorris
Fri Oct 13, 2017 8:09 am
Forum: Hardware
Topic: What is the going price to have EPROMs burnt?
Replies: 17
Views: 220

Re: What is the going price to have EPROMs burnt?

For another project that I run I sell EPROMS for £2 + postage. If someone sends me an EPROM I won't charge to burn it for them. In truth they never do, though :)
by sirmorris
Thu Oct 12, 2017 9:01 pm
Forum: Development
Topic: Explain this behavior
Replies: 14
Views: 535

Re: Explain this behavior

Fast horizontal scrolling will require a modified video routine, one which allows movement across a larger buffer. It's possible.