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30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
Good idea - I've never used the floating bus myself. There'd still be a fair bit of variability in the results of that as a test, but using that and say, the first 8 lines of contention you should easily have everything lined up exactly. -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... ]
I didn't test it, but if my interpretation ... in any Spectrum model during contention. -
Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... lot more aggressive hardware identification test (please see the link at ... if anyone knows a reliable test for that one). Is it ... emulators) that do not match contention and frame duration tests this ... -
Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... an additional test that is sensitive to specific memory contention patterns. In ... -
Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... as the structure of the contention pattern on TC2048 and TC2068 ... unsurprisingly different, and since my contention test depends on the frame duration ... have a small EAR-based test which I do not trust ... -
Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... horizontal screen position in my contention test and this is the first ... -
Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... it generates differing amount of contention on 128k and on +3 ... (due to their different contention patterns). I start this loop ... cryptic number returned by this test (it is not completely easy ... delay during the very first contention. The difference is just a ... -
Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... also be a good test. Or a test of the floating bus ... to go with the memory contention, because it also helps to ... of them have no memory contention at all). -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... z80 instructions.
about the contention, the sd card clock follow ... bits because of the ULA contention.
And using the outi ... ]
I will have to test more toroughly later this week ... -
ANN: Spud v0.230Ok, another new Spud... [URL="http://bit.ly/16OFkuQ"][COLOR=#0066cc]http://bit.ly/16OFkuQ[/COLOR][/URL] [quote] v0.230 ADDED: Options. When selec…
... and Debugger windows.
3) Contention timings are a bit off ... .zxspectrum4.net/downloads/timing_tests/"]Timing Test suite[/URL].
5) Printer ... -
display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... other emulators. It has no contention at all in the core ... be using it to speed test.
RealSpec is highly ... and as such gets its contention wrong - which is why you ... -
Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…
... for plenty of people to test it :)
And thanks ... about 2nd 16k bank video contention when I wrote FK so ... -
ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…
... the way it cancels the contention with the rising edge of ... end of state T1. This "contention off" mode persists until the ... be ignored by the ULA contention handler as it will be ... put it to a physical test.[/QUOTE]
So as ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... have now updated the ptime test BASIC a bit so ... Would you mind rerunning the test and report if on some ... could run the timing.tap test from [URL="http://zxds. ... and run at least the test #0 and post the first ... we at least got the contention pattern right, as it ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... emulators accurately.
[QUOTE]test #0 ... the first two lines ... not really needed for the contention, it is perhaps just an ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... have just updated the ptime test in [URL="zxds.raxoft.cz ... even on 128k, despite the contention. This is not to reveal ... people can use it to test that they got the emulation ... screen paging (and I/O contention) right even on that machine ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... =Patrik Rak;757618]This [ptime test for 128k] is not to ... people can use it to test that they got the emulation ... screen paging (and I/O contention) right even on that machine ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... ptime version with the 128k contention change added? The tap should ... this, other than that the test loop must have become misaligned ... interrupt and thus skewed by contention for some other reason (for ... -
Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…
... 'm assuming here that memory contention from HALT isn't something ... 0x3fff and rely on correct contention, and there'll typically be ... ). At least this I can test myself.
My current ... -
Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... no way to avoid the contention as ULAplus is part of ... before we knew what the contention would be. Although Woody guessed ... emulation it was possible to test the HAM8x1 mode in software ... -
128K shadow screen?Hi How does the shadow screen feature work , and how can it be used?
... can't get away from contention. Both screen banks are contended ... . The others you can either test for (by seeing how much ... -
128K shadow screen?Hi How does the shadow screen feature work , and how can it be used?
... it'll be slowed by contention). Any interrupt vector tables and ... : I have created a small test program , and the above call ... know) in ASAM. My simple test program crashes when I compile ... -
Issue 4s - Not 'Jailbars' but lines alloverIt's not another 'Jailbars' question!, but I've got this Issue 4S that aside from the 'Jailbars' on the Paper area of the screen which I can live wit…
... , and if the CPU enters contention, the ULA halts its clock ... the above mentioned contention.
A quick test: if your Spectrum ... -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... in the RAM bank to test until the next interrupt triggers ... I say though, testing for contention is probably overkill, just identify ... long as you run your test code from the right location ... -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... in the RAM bank to test until the next interrupt triggers ... I say though, testing for contention is probably overkill, just identify ... model instead of testing page contention, you are not "testing the ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... excellent choice for a quick test of something, or for someone ... 512K Spectrum with no memory contention (similar to a Pentagon I ... works and lack of memory contention, border and multicolour effects don ... work on ZX Prism. Memory contention will be modelled in the ... -
Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... only corrects overly aggressive IO contention - you can run a Speccy ... up as a failed memory test.
I'd examine ... -
XPECCY (Lin/Win)im not author of this emulator. Contacts of author you may take on [URL]http://xpeccy.info[/URL] - non official home page. cpu: Z80: all (un)docume…
... and ran a few Spectrum test progs through it.
Contention Test Suite and doesn't do ... -
Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …
... then perhaps have one additional test for IN/OUT added which ... useful if a test which is supposed to test contention requires getting floating ... tests don't depend on contention, too. Or that a documented ...
