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Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... to measure memory contention?
ie where do they assume the ... />
The ULA holds the CPU clock high as soon as an address in the range ... various tests I have the src for to see....
Chris -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... />
The ULA holds the CPU clock whenever an address in the range 0x4000 to 0x7fff ... pattern (because the ULA is [B]not[/B] connected to the Z80 IOREQ pin!), only ... uncontended
- Ports with a high byte between 0x40 and 0x7F ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... *pyr_VisitAllPlayersAntiSorted(void *f) // low score to high score
{
void *ret ... know this is going to be confusing to anyone new to C or any ... that address points to ("*ret") is nonsense in C because the compiler does ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... M3 cycles, but to the other cases where the 48k ULA applies contention when ... there is no memory access going ... on (check the ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
[QUOTE=Woody;214385]Barring the same fencepost error again, we' ... re now agreed that the FAQ and Wiki are correct ... is going on on the hardware level. At least as far as the ULA ... very likely as well, although the T3 of IN #xxFE not ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... is going on on the hardware level. At least as far as the ULA ... held until they are outside the bytefetch cycle range.
... I think it explains where the issue2 ULA bug appeared from. Investigating ... cycles too far to the left, but you get the idea).
< ... -
I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…
... MOS-based chips like the CPU and ULA to suffer SCR latchup ( ... anything critical.
The ULA is a bit of a ...
The CPU: you can get a brand new Z80 - they are ... to do with the decreasing availability of the original DRAM rather than actively going ... -
I've got a divIDE. Now what?I've purchased a divIDE and after a month it's at home. What can I do now with that? I've got a 48k+, a +2B and a +3. The +2B has the original ROMs,…
... seems strange that you're going to have all that storage capacity ... that matter - sort of defeats the object. Luckily, I have designed ... />
Take a look at the Projects section on my website ... my divide+, I'm pretty high on the list (currently 17) so ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... fun. I was considering a high-colour mode version but I ... as an intermediate language to port to other z80 machines.
[QUOTE ... 's going to have to be some 3rd party code to stitch the loops together ... -
Q. on a Gutz-like game (YANTG).Hello people, and other beings. I was playing [URL="http://www.worldofspectrum.org/infoseek.cgi?regexp=%5EGutz$&pub=%5EOcean+Software+Ltd$&loadpics=…
... 'N'R site and going through the screenshots to jog my memory but ... it's slow-going on dial ... -up. Might continue with this site on a high ... -speed connection tomorrow.
Do you guys remember the ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... formula using the "seed" value (the last random number generated). A ... going to add one to the seed value while the game is in menu mode. The ... call malloc() to get memory; because the z80's address space is ... we poke into the rightmost column the byte that is ... -
Broken SpectrumsChaps ( & Mrs Death ), I was looking at getting some dynamic ram chips for the next phase of the Harlequin stuff, and I started thinking...... I've…
... /> Are either of you going to the meet-up on the 20th??
ULA replacement prototype was my original ... /> I could possibly be going on the 20th, it depends on who ... want to go all the way there to find nobody I know to talk to. -
Anyone got information on the Playstation 3If anyone here owns one could you let me know what its like to use, and what are the negatives about the machine, in particular i would like to know …
... 219113]Thanks for the info Vampyre to be honest the cons u mention ... the original PS2 one ? I am going to get one on Wednesday, phoned the ... a film that then switches off due to network traffic. If you ... need some software to convert the avi's on the fly, Nero 7 ... -
Oxford Speccy meetup, October 20th[b]Update:[/b] Date and venue decided - The Gloucester Arms, from 2pm, 20 October 2007. Full details: [url]http://matt.west.co.tt/spectrum/oxford-spe…
... QUOTE=beanz;220813]Damn thats high...most I have ever paid ... Zealand flew from the west coast of the US to the UK, he is ... 's one of the cheapest cities to fly to from the UK, cheaper than ... people going on business, or people visiting family/friends want to go to ... -
A vexatious questionThis is kind of a follow-up to a question about RST #8 and hardware that I wrote in the development forum a while ago. To summarize that: certain ha…
... 0x0008 on the address bus). It also traps 0x0700 to page out. To prevent ... will check the state of ROMCS before nailing the signal high and paging ... shadow ROMs on the edge connector are just not going to work, at ... -
Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... the ULA responds to every single even numbered port address). This means the ... it's worth downloading the Z80 User Guide (just google ... will show all the timings for the Z80, and explain how ... high before the data is de-asserted on the data and address buses? The ... -
Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... data on the data bus for the z80 to read at the end of the i ... was the first to shat across the i/o space though as the ULA only ... your hw and the ULA don't respond at the same time and ... if you're only going to partially decode the port address), /IORQ is low ... -
Where will Microsoft go after Vista ?If i were Microsoft, i would develop a media center only OS with no backwards compatability that would be able to be used on a Dual Booted pc running…
... it's easier to get Fedora 7 going than the latest Windows XP ... industrial design, that actually extends to the operating system.
Otherwise ... will appear cryptic to someone used to the high level because the kernel *is* low ... -
Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…
... I/F mode uses 15bit address line and 8bit data line ... I/F mode uses 2bit address line and 8bit data line ... way to determine if an /INT signal has been generated by the ULA or ... to be added to determine if it's a ULA generated INT or CTC generated ... -
Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…
... /> I'm going to use a single CPLD for the glue logic (I ... chip select line (I know I can already do all the paging ... a 2-to-4 line decoder provides 4 chip select lines, and ... but I have to pay high carriage costs for the small order, Rapid ... -
Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…
... /> I'm going to use a single CPLD for the glue logic (I ... chip select line (I know I can already do all the paging ... a 2-to-4 line decoder provides 4 chip select lines, and ... but I have to pay high carriage costs for the small order, Rapid ... -
Fastest Baud Rate On A Loader ?Following on (sort of!) from the thread about the best loading.... Which game(s) had the fastest (highest baud rate) ? I seem to remember a couple …
... the average signal level remains zero, each period between the signal going high and going ... low has to be matched with ... an equal period of the ... -
Fastest Baud Rate On A Loader ?Following on (sort of!) from the thread about the best loading.... Which game(s) had the fastest (highest baud rate) ? I seem to remember a couple …
... the average signal level remains zero, each period between the signal going high and going ... low has to be matched with ... an equal period of the ... -
Fastest Baud Rate On A Loader ?Following on (sort of!) from the thread about the best loading.... Which game(s) had the fastest (highest baud rate) ? I seem to remember a couple …
... was directly wired to the pin on the ULA that senses the EAR level, you ... returning to zero. You can't make it go high again until ... you first remove (or reverse) the applied ... -
Something completely different (new game tech-demo)Since finishing Stranded 2.5 (available soon from Cronosoft - plug!) I've been playing with the idea of doing an attribute-based, rather than pixel-b…
... will start to deplete. The aim of the game is to drop your ... /> [quote]The idea of the background is that it's going to be different ... myself eventually with the DS all the way up to my nose ... so far, apart from to clear the levels? High score table anywhere yet ... -
What was a Z80 computer capable of ?I have always wondered, and maybe the techy people on here could answer, with what you know about the Z80 processor, was the spectrum hampered by the…
... the z80 is responsible for generating the video picture and in FAST mode the z80 ... this one example the video is generated by circuitry other ... processors are limited to a 64k address space so that ... was not necessary to support a high resolution display for ... -
New services?Following up from the thread [URL="http://www.worldofspectrum.org/forums/showthread.php?t=18044"]My idea for Spectrum game fans[/URL], what would you…
... that there was the occasional bit of bribery going on? Well ... have liked the ability to use attachments in the forums, but ... high score comparison page, or add the known high scores of each game to ... />
You're still going to get overthrown though. And cast ... -
Your help needed![FONT=Arial]there are [URL="http://www.worldofspectrum.org/neededscreens.html"]a number of titles[/URL] (146) that still lack an in-game scre…
... using breakpoints to determine where these programs are going wrong.
51 Column display? Y
Top ... to work. There's something wrong somewhere, because the LOAD address for the ... was developed in loaded into high memory, so that it ... -
New assember ideaAs i work with Eclipse IDE in my job i become more and more lazy. This leads me to idea that it is time to left Notepad+Tasm combo behind and move on…
... use the same syntax as SPIN) if you're going to support ... (.). Pasmo does require you to use the --alocal command-line switch ... blocks. In SPIN, the actual label generated is a combination of ... the current global label and the ... -
New services?Following up from the thread [URL="http://www.worldofspectrum.org/forums/showthread.php?t=18044"]My idea for Spectrum game fans[/URL], what would you…
... there was the occasional bit of bribery going on? ... high score comparison page, or add the known high scores of each game to ... URL] directory (all linked to the relevant database entries).
the suggestions coming!
[quote]You're still going to ...
