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ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... -82;224891]But how is contended memory refreshed? By constantly reading ... -
ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... the instruction fetch. T1 is contended if the instruction fetch is ... -
Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…
... bus....skipped (b=0x01)
contended memory...failed (0x01)
High ... bus....skipped (b=0x01)
contended memory...passed
High port ... -
How does the Z80 communicate with hardware?How does the Spectrum (or Z80) interact with other hardware devices? I think devices can communicate with the CPU through interrupts, but how can the…
... memory mapped region for the IO, which among other things allows ... -
Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…
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It sounds like the IO decoding for page ins is ... sounds like there's no IO decoding going on at all ... -
Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…
... spectrum's ram is only contended while the display is drawn ... -
Problem with replacing all upper memory with 4164 chipsGuys, i have a problem with the high memory of a 4B issue. At first the board had OKI chips for high memory and one of them was faulty. Since its ea…
... of the screen is in contended RAM and appears fine. When ... -
Changing the colour of the loading 'stripes'I was wondering if it were possible to alter the default colours of the standard ROM loading 'stripes' via BASIC, mabye a POKE command of some descri…
... /saving code cannot run from contended memory at 23762; the main ... -
another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)
... ]Armalyte, Enforcer[/b] and [b]Io[/b] on the C64 to ... -
Fuse 0.9.0 releasedVersion 0.9.0 of [url=http://fuse-emulator.sourceforge.net/]Fuse[/url], the Free Unix Spectrum Emulator[/url] has just been released. Highlights of t…
... ZXCF support.
[*]Much improved contended memory and floating bus emulation ... -
sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …
... ULA from responding to odd IO port numbers (by switching +5V ... -
The new GP2Xpectrum releases threadYeah, I know the thread title isn't exactly too original, but I've decided that just one post to hold all updates makes more sense than a lot of smal…
... speed emulation, tape sound, and contended mode while the game is ... -
The new GP2Xpectrum releases threadYeah, I know the thread title isn't exactly too original, but I've decided that just one post to hold all updates makes more sense than a lot of smal…
... speed emulation, tape sound, and contended mode while the game is ... thing has happened with the contended port emulation, the autoloading and ... -
The new GP2Xpectrum releases threadYeah, I know the thread title isn't exactly too original, but I've decided that just one post to hold all updates makes more sense than a lot of smal…
... thing has happened with the contended port emulation, the autoloading and ... the cpu code, such as contended port emulation, but I didn ... -
The new GP2Xpectrum releases threadYeah, I know the thread title isn't exactly too original, but I've decided that just one post to hold all updates makes more sense than a lot of smal…
... thing has happened with the contended port emulation, the autoloading and ... -
Games with completely unsuitable speech samplesOK, so there may not be many on the Speccy, but I put far too much time than it deserved into a N64 game called Chopper Attack (fnar!) also known in …
... /> And I'm sure the IO Towers in the second stage ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... the 16k-32k area is contended which means the z80 has ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... the 16k-32k area is contended which means the z80 has ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... want to check out the contended memory section of the [URL ... -
DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…
... an interrupt vector table in contended memory, which has unpredictable results ... -
Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…
... to check the accuracy of contended memory and port emulation. -
Another fusetest runWould anyone with a real machine be prepared to try the latest version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.zip]fusetest[/url], my…
... /> LDIR... passed
Contended IN... passed
Floating bus ... ... passed
Contended memory... passed
High ... /> LDIR... passed
Contended IN... passed
Floating ... skipped (B=0x01)
Contended memory... passed
High ... -
Another fusetest runWould anyone with a real machine be prepared to try the latest version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.zip]fusetest[/url], my…
...
LDIR... failed (0xfe)
Contended IN... failed (0x02)
Floating ... bug... failed (0x00)
Contended memory... passed
High port ... -
Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... timings will be relating to contended memory/port access, which is ... -
Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... Spectrum, unless your code accesses contended memory or ports (or the ... code itself is located in contended memory) in which case you ... -
Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…
... handle the speaker and tape IO.. got that breadboarded, but not ... -
MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…
... will slow-down by ULA (contended ports).
For multisector ... -
MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…
... will slow-down by ULA (contended ports).[/QUOTE]
Good ... -
MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…
... values as high byte of contended memory adress.
#00-3E ... I set to this slow(contended) memory.(BLACK RAVEN, IMPERIA 3 ... register I is set to contended memory and modify value to ...