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Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …
... in carefully timed chunks around HALT instructions. I'm not sure ... -
Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…
... time, 8 T-states when contended. The RAM contention pattern on ... Spectrum is 128T (16*8 ) contended, 96T (24*4) uncontended. Therefore ... -
Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…
... time, 8 T-states when contended. The RAM contention pattern on ... Spectrum is 128T (16*8 ) contended, 96T (24*4) uncontended. Therefore ... -
Why do they always smile in supermarket adverts?Did you ever notice in the like the supermarket adverts on tv,they always seem to be smiling and full of life,then when you go into real supermarket …
... everything suddenly grinds to a halt, and all eyes are on ... -
Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …
... it won't run in contended memory (e.g. where your ... -
Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …
... it won't run in contended memory (e.g. where your ... -
Flash based rom replacement board for +2A/+3I'm sure I already started a thread about this, but I can't find it... Anyway, this post's to say that I've just sent off the order for the printed …
ROM loading DOES work in contended memory with some adjustments. I ... have the ROM in non-contended and the regular screen visible ... -
Pretty CrashesTo make a 48K spectrum crash spectacularly and beautifully enter the following into basic. Also works on a 128k in 48k mode though not quite as prett…
... /jargon/html/H/HCF.html]Halt and Catch Fire[/url] instruction ... -
Pretty CrashesTo make a 48K spectrum crash spectacularly and beautifully enter the following into basic. Also works on a 128k in 48k mode though not quite as prett…
... /jargon/html/H/HCF.html]Halt and Catch Fire[/url] instruction ... -
I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…
... my setlements before i could halt their advance. took years to ... -
designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... wish to add NOP and HALT instructions, which are trivial as ... -
Help! Reverse engineering a Spectrum game[deleted]
... next video frame (see Z80 HALT)
04 - A set of ... -
Help! Reverse engineering a Spectrum game[deleted]
... , and (3) is just a HALT instruction, and could be considered ... -
Help! Reverse engineering a Spectrum game[deleted]
... , and (3) is just a HALT instruction, and could be considered ... -
Help! Reverse engineering a Spectrum game[deleted]
... , and (3) is just a HALT instruction, and could be considered ... -
Help! Reverse engineering a Spectrum game[deleted]
... useful in tools...
HALT/Interrupt:
Vsync is ... not just throw in a halt to sync the frame whenever ... -
Help! Reverse engineering a Spectrum game[deleted]
... video frame (see Z80 HALT)
[B]HALT[/B]
04 ... -
zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... more memory. This bank is contended. The other bank contains memory ... />
If the non-contended RAM is damaged, the machine ... machine.
If the contended RAM is damaged, the computer ... : a chip in the contended bank is damaged. Further analysis ... -
zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... seems to be pointing to contended memory ,
ok how ... -
zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
but what physical IC no's are the contended memory ? -
zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... IC no's are the contended memory ?[/QUOTE]
According ... have, IC17-24 are non-contended memory, while IC25-32 belong ... to contended memory.
My schematic ... would be bit 0 of contended memory, and IC32 would be ... -
zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... two physical memory banks: contended and not contended. Each chip inside one ... are stored in the non contended memory bank. Pages 1,3 ... 7 are stored in the contended memory bank.
So ... -
zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... /> because according to them the Contended bank is IC's 6 ... -
How to Write ZX Spectrum Games As some of you may know, it has long been my intention to produce a document which explains pretty much everything I have learned - and am still lea…
... /> Chapter Twelve - Timing
The Halt Instruction
The Spectrum's ... -
WTF stupid machine10 LET X = 28672 or 61440 depending on how much memory you have 20 LET A$ = ?? 30 IF A$ = ?? THEN INPUT A$ 40 LET Y = CODE A$ ? 48:IF Y>9 THEN LET Y …
... have about 25K of non-contended (that is, fast) memory.
Why do cars have gears?Seriously, as a non-driver I don't know why cars have gears. A mate of mine is buying a car and is thinking of getting an automatic, and he asked me …
... accelleration:
Floor it from halt, then quickly and shortly release ...Opinion on new 128K only gamesHello, Being new to the WOS community, I am unclear on the attitude towards 128K only software, that is; Is there a strong need to support the 48K m…
... read it just after a HALT instruction, as the ULA will ...Beepola v1.01A new version of Beepoa, v1.01, is now available for download from:- [URL]http://freestuff.grok.co.uk/beepola/Beepola_v1.01.00.zip[/URL] (650KiB) …
c.s.s. Sinclair FAQ domains recoveredAfter the original registrant of the [URL="http://www.sinclairfaq.org/"]sinclairfaq.org[/URL] and [URL="http://www.sinclairfaq.net"]sinclairfaq.net[/…
... ://scratchpad.wikia.com/wiki/Contended_memory]Contended memory[/url]" article on the ...
