Spectrum Computing

This road appears to be full of pot holes and bumps. Maybe it's a track way and not a road???

Mark

To be fair, 6502 programming books make a big deal about addressing MODEs, but Z80 books, not so much. I think partly due to the different mnemonics that are used. In summary, as with most things, there are as many "standards" as there are CPUs! Have a read of the Wikipedia page! Mark

Maybe we should consider a completely different system. Maybe one based on how useful each persons introduction post is? Or failing that, how many letters (characters) long their post is...

Mark

The Z80 CPU will only detect a maskable (normal) interrupt when it samples the /INT pin at the end of an instruction (assuming that /RESET, /BUSRQ and /NMI are all inactive Tut-tut. Use the Force (of BBCode), Mark. It’s INT , RESET , BUSRQ , and NMI . :D Yeah, I know :? But I composed this post off...

The ULA in a ZX Spectrum generates a 64us (32 T-states) pulse at the being of the (non-visible section of the) TV/video field. Hence the frequency being 50Hz. The ULA does not hold the interrupt line active if the CPU ignores it and it does not provide any other interrupt facilities. This interrupt ...

Pure awesomeness, @PeterJ! Thank you! Hey, @1024MAK, how cool is that? RESET CLK MREQ Very cool 8-) Makes talking about logic level and Z80 control signals a lot easier ;) Alas, a bug has bitten. When using the quote button and quoting a post that has the at @ symbol in followed by a user name, I g...

For some of these BBCode features, you should be able to "switch on" the relevant buttons for them in the edit box. For example, buttons exist for strike, sub, super...

Mark

Yes!

Ooooo! How to divide the forum.... For the quick links and other links within the forum, I prefer to open in the same tab. For external links, yes, often it is helpful to open in a new tab. We won't mention that I can quickly go from about three open tabs to about 33 in the blink of an eye... :lol: ...

there is no permission to redistribute the µSource firmware so it's not going to appear here. I am aware of that. Nevertheless, it would be helpful to have a consolidated repository for firmware that can be freely distributed. Even if there is software/ firmware where permission cannot be obtained,...

ZXDunny wrote: ↑Sun Nov 19, 2017 11:02 pm

1024MAK wrote: ↑Sun Nov 19, 2017 8:31 pm Also being talked about here

Mark

Help! I'm stuck in a loop!

1. Go back around and try again.
2. If still stuck, try step 1 again.

Having full width posts makes the text harder to read. Long lines are problematic, that's why magazines and newspapers use columns :D These things have been studied by large enterprises (Apple, Microsoft, etc) and have a scientific background. That's why Facebook on my PC only occupies a tiny fract...

Also being talked about here

Mark

This subject is also being talked about here

Mark

@Peter and @R-Tape, no worries. I just wondered. I know that forums can be a bit tricky until you have been "in the dark side" for a while...

Mark

Yes

As the title suggests we've had a crack and formed a forum admin team. We are: PeterJ - Mr SpectrumComputing, ZX fan and gardener, learning assembly Rorthron - Graphics and crossword wizard IvanZX - host of the ZXDEV comp, all round ZX fanatic R-Tape -ZX developer, new ZX game fanatic A huge thanks...

Personally, on phpBB based forums, nearly the only time that I use the home page, is on forums where I am a moderator and am checking each sub-forum. Normally I just use either a bookmark to the active topics page, or use the quick links (top left of the page) to get to the active topics page. Mark

Wow, a fight, and after only a few days since most current members discovered this forums existence :lol: Maybe the link in the logo should go to a new page that is neither the web site home page or the forum home page, but instead is a page which has (currently) two big, easy to see (and use) links...

I got my first ZX Spectrum - a rubber-keyed 48K model - for Christmas in 1982, and have been a computer programmer ever since. One or two replacement Spectrums later, I stopped using the machine around 1990 (I think). The last replacement currently rests somewhere in the attic, and owing to me bein...

The simple answer is to make the hardware simpler, hence keep the cost down (hence keep the design of the ULA and it's RAM interface as low cost as possible). For once, the design has very little in common with the ZX80 or the ZX81. They use a completely different method of screen generation and in ...

On the machine that I'm currently using, the browser is Firefox 56.0 (32-bit), which is running on a Linux OS. Note that Safari on an iPad mini does not produce this warning. The Firefox browser does have various plugins, but none inject mark-up on any pages and it is fine on other secure sites. The...

I did my investigations on the FAQ page...
No user images or links there as far as I could see...

Mark

All pages do it. I think it is either the logo picture, or the associated link: http://spectrumcomputing.co.uk/

EDIT: it's the link, as loading the GIF image alone does not generate the warning.

Mark

btw, I already told you that RMartins was recently banned (without proper explanation) and I almost cant believe you didnt notice it. Maybe it should have been banned, but we dont know that, and we probably will not find out. And why Vega+ should it be banned anyway? 5000 fans have invested their m...