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Spectrum 48k won't start any software but passes all RAM testsI have a rubber key 48k which will not start any software - it appears to work perfectly right up until the end of the tape and the program would sta…
... /brendanalford/zx-diagnostics/wiki/Tape-Tests no problems were found with ... -
128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... my head around the memory contention issues of the various 128K ... what is the cause of contention for banks 1,3,4 ... downs due to this apparent contention issue. -
Some questions about the Timex TC2048/TC2068I have been doing some research about the specs of these 2 machines but I suppose it would be better to ask for advice in the forum since I have neve…
... or analogue?
Can the TC2048 be hacked to route the ... making it work like the TC2048?
The expansion bus ... -
Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …
... reduce the effect of memory contention considerably. Possibly with the addition ... -
Help with a TIMEX TC2048 and memory problemBought a 2nd hand Timex TC2048 but unfortunately I detected a problem with the machine which is preventing it from working properly. I believe it …
Bought a 2nd hand Timex TC2048 but unfortunately I detected a ... -
Writing own emulator: Contention questionsHi! (I don't know if this message should be here or in Hardware) I'm trying to write my own emulator just for the sake of it, and I'm having pr…
... having problems understanding the memory contention in 48k, in instructions like ... is being used there for contention.
Thanks ... -
Timex TC2048 fixed gamesHello everyone. I am looking for games fixed or patched so that they run properly on a TC2048. Not sure if there is a list somewhere of games whi…
... they run properly on a TC2048.
Not sure if there ... -
zx spectrum 48k issue 6A boot fail- black paperohh whats wrong with this poor specie .. boot fail,, border white & paper black .. when reset it shows the red lines to indicate that the CPU is cycl…
... the ram passes.. but the contention test fails, the interrupt test ... high frequency . the ram refresh tests reports a pass but they ... -
Exact emulation of the Snow effectAs the original post on another forum is outdated, and for those who don't know about that forum, I duplicate this info here: At the beginning of …
... implemented, and my snow effect tests, which are modifications of the ... at my request, launched my tests on their machines, and shot ... screen immediately after loading the tests are caused by an ... half of T4 it cancels contention, but it proceeds keeping fixed ... -
Problem with RealSpectrumWhy am I having difficulty getting certain games to laod in RealSpectrum? The game seems to be loading ok then the screen goes black and nothing hap…
... I have based RealSpectrum's contention timings upon my own Spectrum ... I need to make some tests. Pity I have to leave ... -
Emulation accuracy and how it affects softwareHi folks. I was thinking of bodging together a rudimentary Spectrum emulator myself, not as a competitor to the other emulators, but as an integrate…
... on the Timex. Fuse's TC2048 emulation misbehaves authentically with Uridium ... . However I do believe the tc2048 has a resistor decoupled data ... away. So I think Uridium tests for the Kempston fire button ... -
Spectrum 48k benchmark program/resultsIs there any program (basic or assembler) to test performance of a Spectrum 48k? Want to compare results in my FPGA Spectrum 48k with real hardware …
... got some detailed tests used for researching the updated contention and timing ... -
Spectrum emulator tests on WEB?I searched little with google, but didn't find it. Can I get some URL?
... , here's a page of tests I just did:
SPIN's memory contention is apparently "not good" when ... -
Spectrum emulator tests on WEB?I searched little with google, but didn't find it. Can I get some URL?
... , here's a page of tests I just did:
[quote]
SPIN's memory contention is apparently "not good" when ... -
RealXThis may be a dumb question but will RealX ever get released?
... guy to repeat all the tests we made in 1999 with ... for t-states offsets (first contention, electron beam offset, snow effect ... -
RealXThis may be a dumb question but will RealX ever get released?
... - he made the tests, and the "snow contention" is definitely present ... as saying that no contention is applied during snow ... Our snow contention is accurate based on our tests. Your algorithm ... contention cycle, the snow mechanism and all our floating bus tests ... -
RealXThis may be a dumb question but will RealX ever get released?
... he made the tests, and the "snow contention" is definitely present ... do you mean by "snow contention".
[QUOTE]
... contention cycle, the snow mechanism and all our floating bus tests ... the preliminary tests, it seems that the first contention (6T) is ... -
RealXThis may be a dumb question but will RealX ever get released?
... ]Dunny likes to call contention based on the IR register ... does), which can possibly cause contention [b]later[/b], but certainly ... and it doesn't apply contention to take precedence as usual ... :)
Concerning the new tests made by Alessandro (which I ... -
Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…
... takes after you include memory contention. I just show the time ... % accurate measure because of memory contention and different timings on conditional ... in handy for simple optimization tests. Adding up T-states with ... -
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…
... instruction timings
- Added bus contention for IN and OUT
- Replaced the memory contention emulation using a more precise ... ), but I must make some tests to check if it's ... -
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…
... timings
- Added bus contention for IN and OUT
- Replaced the memory contention emulation using a more precise ... but I must make some tests to check if it's ... />
Excellent news. However, memory contention isn't all that important ... -
UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.
... . If both computers pass the tests, I'll probably sell one ... ]
Very interressed on TC2048... Let me know when the ... -
Emulator Comparison ChartHi. In a similar vein to [URL=http://www.ppest.org/zx/zxse.php]Piters[/URL] comparison of various ZX emulators, I've been looking at adding some deta…
... trying to test. For memory contention and display timings, Shock Megademo ... -emulator/trunk/fuse/z80/tests/]internal Z80 tests[/url] and [url=http ... -
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…
... usual documented T-states (contention start at 14335) differ ... all software tests would be off, not some (contention test they ... modes when the memory contention is implemented according to ... is contended by the memory contention!!)[/QUOTE]
Well ... -
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…
... all software tests would be off, not some (contention test they ... instance says that memory contention begins at 14335, and ... (This is IO contention!). Now, the tests we're running ... [QUOTE]"[I]IO contention is different from memory contention[/I] ......" Now ... -
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…
... "Fuse"'s model (specifically, memory contention at 14335).[/QUOTE]
tests passed.
I'll ... -
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…
... it was usual for tests to measure memory contention?
ie ... where do they assume the contention applies? T3, when the actual ... go an look at various tests I have the src for ... -
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…
... it was usual for tests to measure memory contention?[/QUOTE]
< ... out, the IO contention and Memory contention differ. So the ... according to the memory contention pattern and the other ... slightly different test for memory contention in this case anyway, ... -
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…
... floating bus timing and how contention affects instructions.
2. ... cycles to investigate, and any tests you care to run only ... doing analysis from software, the contention [I]looks like[/I] it ... talking about which cycles the contention is [B]actually[/B] ... -
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…
... So, has the "[I]contention starts at 14336 and ... statement come about because contention was investigated using IO instructions ... irrelevant. My contention.tap test shows that even tests which don ... long, which means the contention can be applied anywhere in ...
