Search found 98 matches

by 1bvl109
Tue Apr 19, 2022 3:09 pm
Forum: Sinclair Miscellaneous
Topic: Are we the baddies?
Replies: 0
Views: 142

Are we the baddies?

Or maybe even more disturbing, were our parents those, in case they bought the machine? Ok, this is not a Sinclair thing strictly and the evidence it cites is an Apple commercial, which I don't really get the gist of, but please bear with me. The data this article presents, surely demands an explana...
by 1bvl109
Sun Jun 28, 2020 1:10 pm
Forum: Other Retro Stuff
Topic: Here we go again .. and again ... and again ...
Replies: 12
Views: 2141

Here we go again .. and again ... and again ...

Does anyone keep count off the number of retro waves we've been through?

http://www.asahi.com/ajw/articles/13460000
by 1bvl109
Sat Jun 20, 2020 5:35 am
Forum: Hardware
Topic: edge connector measures
Replies: 20
Views: 2438

Re: edge connector measures

ultimate wrote: Fri Jun 19, 2020 11:45 pm ... but I'm still interested in that edge-connector industry standard documentation, have you got any link to the official standard doc?
Wikipedia on ISA simply refers to "standard edge connector sockets". So it may be a quasi-standard which is older than dirt.
by 1bvl109
Mon Jun 15, 2020 1:00 pm
Forum: Sinclair Miscellaneous
Topic: Spectrum memes
Replies: 1216
Views: 197425

Re: Spectrum memes

Juan F. Ramirez wrote: Fri May 22, 2020 7:53 pm Image
This game's as difficult as running on stilettos through the jungle. You've been warned, Bro.
by 1bvl109
Mon Jun 15, 2020 12:52 pm
Forum: Sinclair Miscellaneous
Topic: Specchums and the coronavirus.
Replies: 395
Views: 73505

Re: Specchums and the coronavirus.

That looks absolutely delicious Alessandro, ... As does every food picture he posts. To dangerous for me though. My stomach might become artsy and spoiled and refuse to function properly when going back to chips right out of a bag. ... but there's not enough insulin in the world for me to have a sl...
by 1bvl109
Fri Jun 05, 2020 5:30 pm
Forum: Sinclair Miscellaneous
Topic: Spectrum memes
Replies: 1216
Views: 197425

Re: Spectrum memes

Juan F. Ramirez wrote: Fri May 22, 2020 7:53 pm Image
It's a weapon of course.
by 1bvl109
Wed May 13, 2020 12:35 pm
Forum: Sinclair Miscellaneous
Topic: Spectrum memes
Replies: 1216
Views: 197425

Re: Spectrum memes

I still don't know if this counts as a mem, but it is definitely about overpriced, vintage silicon

Image
by 1bvl109
Sat May 02, 2020 7:05 pm
Forum: Hardware
Topic: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?
Replies: 42
Views: 5028

Re: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?

not hardware sprites but rather object descriptors (likely including the sprite data) OOP-Think in assembler than. IY is used to access system variables (and due to a bug, it needs to point at them all the time if the interrupt mode 1 is allowed) This I admit is some reasonable use, so that you can...
by 1bvl109
Sat May 02, 2020 6:35 pm
Forum: Sinclair Miscellaneous
Topic: Conway
Replies: 16
Views: 2629

Re: Conway

Those types of bugs ... There all seems to work first, but then there arises some ephemeral strange behaviour under certain conditions. I hope this is correct now. ORG $8000 ; UP: DEC H ; Up one pixel (assuming within chr square). LD A,H ; A:= high part of address. OR $F8 ; Use only bits 2, 1 and 0....
by 1bvl109
Sat May 02, 2020 3:33 am
Forum: Sinclair Miscellaneous
Topic: Conway
Replies: 16
Views: 2629

Re: Conway

Macro-Life by Toni Baker The link to archive.org there only has the main text of the article without the source code. So I took the freedom to adapt it to be compilable by zasm ORG $8000 ; UP: DEC H ; Up one pixel (assuming within chr square). LD A,H ; A:= high part of address. OR $F8 ; Use only bi...
by 1bvl109
Fri May 01, 2020 4:03 pm
Forum: Sinclair Miscellaneous
Topic: Specchums and the coronavirus.
Replies: 395
Views: 73505

Re: Specchums and the coronavirus.

How about you can't get access to a high efficiency mask because they're not in stock, and when they do come into stock they are £150 each, and you don't have that amount of money left in the bank. This is not the situation I see online, but I don't want to weasle out here. So depending on the kind...
by 1bvl109
Fri May 01, 2020 3:52 pm
Forum: Sinclair Miscellaneous
Topic: Specchums and the coronavirus.
Replies: 395
Views: 73505

Re: Specchums and the coronavirus.

Of course one other aspect, is the people being too afraid to go out to work. In the U.K. various workplaces have suspended some or all operations even though they were not required to do so. It’s likely that the government will want these operations to resume along with the easing of the current r...
by 1bvl109
Fri May 01, 2020 3:37 pm
Forum: Hardware
Topic: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?
Replies: 42
Views: 5028

Re: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?

I find coders arguing quite an amusing thing to watch, that's because I've always sort of imagined (being a complete ignoramus in this field) that there shouldn't be any room for manuever. Well sure, we only need a couple of Next or other hardware emulation, where we can run different CPU-designs a...
by 1bvl109
Fri May 01, 2020 2:10 pm
Forum: Sinclair Miscellaneous
Topic: Specchums and the coronavirus.
Replies: 395
Views: 73505

Re: Specchums and the coronavirus.

I succumb to the implicit reminder viewtopic.php?p=35706#p35706 that we are not supposed to discuss politics too much.
by 1bvl109
Fri May 01, 2020 1:02 pm
Forum: Hardware
Topic: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?
Replies: 42
Views: 5028

Re: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?

... the relevant Z80 machine code instructions work fine without crashing the screen, as long as you don’t do something silly. I think, I had this in mind ZX80/ZX81 I/O Ports Output to Port FFh (or ANY other port) Writing any data to any port terminates the Vertical Retrace period, and restarts the...
by 1bvl109
Fri May 01, 2020 10:33 am
Forum: Sinclair Miscellaneous
Topic: Specchums and the coronavirus.
Replies: 395
Views: 73505

Re: Specchums and the coronavirus.

The trouble with masks is that you really should have to define which category is being debated over. There's also the psychological message, saying to people you recognise there's an issue and you're making an effort to help keep people safe. That's right, but if you wear a mask, what is the point...
by 1bvl109
Fri May 01, 2020 9:00 am
Forum: Sinclair Miscellaneous
Topic: Spectrum memes
Replies: 1216
Views: 197425

Re: Spectrum memes

Zach still nails it
Image
See the mouse-over at
https://www.smbc-comics.com/comic/weak
by 1bvl109
Fri May 01, 2020 8:08 am
Forum: Sinclair Miscellaneous
Topic: Specchums and the coronavirus.
Replies: 395
Views: 73505

Re: Specchums and the coronavirus.

Firefox wrote: Thu Apr 30, 2020 9:33 pm I might just do this next week. :)
The real ninja here is of course the "Christmas tree".
by 1bvl109
Thu Apr 30, 2020 8:43 pm
Forum: Sinclair Miscellaneous
Topic: Specchums and the coronavirus.
Replies: 395
Views: 73505

Re: Specchums and the coronavirus.

Lockdown is becoming less strict here but the general impression is still this one... If it wouldn't sound cynically, I'd say, thanks for having been our test area. Data from Italy suggests that not getting infected is a real lifesaver. https://wellcomeopenresearch.org/articles/5-75 i.e. the hypoth...
by 1bvl109
Thu Apr 30, 2020 8:21 pm
Forum: Hardware
Topic: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?
Replies: 42
Views: 5028

Re: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?

System designers can use memory mapped I/O on a Z80 system if they wish. I would be hard pressed how a CPU using memory could deny this. Some ZX81 expansions used I/O that was memory mapped. There was plenty of room though. Who needs a shadow ROM? Wait a minute. OUT on a ZX81? Wasn't the screen cra...
by 1bvl109
Thu Apr 30, 2020 11:57 am
Forum: Sinclair Miscellaneous
Topic: Specchums and the coronavirus.
Replies: 395
Views: 73505

Re: Specchums and the coronavirus.

Would anyone else care to admit they're doing fine under lockdown? I'd say I'm doing ok, but if it helps I'm ready to admit, that I'm aware I'm privileged. Others have it real hard. E.g. there are elderly or otherwise disabled peolpe living here, who depend on community and other social services, w...
by 1bvl109
Wed Apr 29, 2020 2:16 pm
Forum: Programming
Topic: Screen Memory - Moving screen address up one line
Replies: 14
Views: 3280

Re: Screen Memory - Moving screen address up one line

After some study the arrangement makes sense. If you are writing software with text output, having a display organised into character rows of 8 pixel lines is useful. But is this really the reason? Has anyone ever asked any designer of the machine? I mean, it seems to be a question which urges itse...
by 1bvl109
Tue Apr 28, 2020 9:19 pm
Forum: Hardware
Topic: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?
Replies: 42
Views: 5028

Re: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?

Except that the PC by convention moves forwards too! Could as well go the other way too. Apart from the fact, that the PC is usually not a register used to manipulate what is there. There darn well should already be something sensible there. The design isn’t inherently dangerous. My code detects wh...
by 1bvl109
Sun Apr 26, 2020 6:58 pm
Forum: Hardware
Topic: Is it evil to downgrade a Spectrum...?
Replies: 16
Views: 2394

Re: Is it evil to downgrade a Spectrum...?

1024MAK wrote: Sat Mar 28, 2020 4:39 pm Everyone ...
Well, maybe except those who owned an 81 with a wuhuhuoooOoobly 16k pack.
by 1bvl109
Sun Apr 26, 2020 6:24 pm
Forum: Hardware
Topic: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?
Replies: 42
Views: 5028

Re: So the Z80 is an improved 8080/8085, but what about LD A,(MN)?

except it's not just for one page :P I'm willing to compromise. Of course the Z80 designer can not be held responsible for Sir Clive's decision, to offer no hardware sprites. In connection with memory mapped hardware which needs more than one address, the (IX+n) stuff actually seems convenient. On ...