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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, …
... make sure I got the ULA timing 100% right. We know when ... reliable information about when the ULA actually fetches the screen bytes ... uses early or late CPU timing, please run the btime test ... -
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…
... 128k) cycles after the ULA has pulled the INTREQ ... after it happens). The ULA needs to fetch the ... on the bus when the ULA reads them, not later ... as well as correct any timing information stated above. I ... real machine but unfortunately ULA in my beloved 48k ... -
Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... I added support for Pentagon timing instead, so I can finally ... bus behavior and timing. An explanation how the ULA replacement fetches the ... -
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…
... gang..
The Speccy 48 ULA Replacement is *almost* here ;)
timing glitches and getting sidetracked researching ... with ULA replacement doesn't quite boot up yet - some timing issue ... -
ULA Plus and Interlace.May be a bit late to suggest this, but here goes. Did the original Speccy ULA actually output a proper PAL interlaced image, with timing pulses on a…
... Speccy ULA actually output a proper PAL interlaced image, with timing pulses ... frame?
Now, does ULA Plus generate a proper interlaced ... -
ULA Price Poll - You get to chooseIt is difficult to set the price of the book. If it is too low I will undersell my efforts, too high and I overcharge. So choose what you would be w…
... content not only documents the ULA circuit, but also full ... details of the Ferranti ULA range, images of the ... technology that was the Ferranti ULA, or the principles and ... supported by full circuit and timing diagrams, photographs and helpful illustrations ... -
4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... perfectly with a 5C112E ULA. I have just been ... whatever their native (version 6) ULA happened to be.
... much more severe as the ULA (I assume) warms up ... makes me think the ULA must sometimes wrongly read ... a difference in the timing of the presentation of ... -
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…
... 0x40-0x7F then the ULA gets confused by the ... address generated by the ULA (who wants to read ... two addresses. Therefore the ULA reads the data from an ... After that 128T, the ULA is busy drawing the border ... once borked up the timing somehow such that it scrolled ... -
5C Horizontal timing vs 6C horizontal timing.Hi all, Just considering the timing difference in the video signal between the 5C and the 6C where the 6C ULA seems to have 50% longer horizontal …
... ,
Just considering the timing difference in the video signal ... the 6C where the 6C ULA seems to have 50% longer ... -
Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…
... put more effort into the timing of the emulated computer (I ... is slower because of the ULA)?
Or must I ... -
WANTED: 128k+ or 128k +2(early grey mod.) ULA chipHello, Attempting to repair my 128k+ speccy. Needs a ULA(IC1)chip from either a 128k+ or an early +2 will work also. If anyone has this chip or has a…
... 128k+ speccy.
Needs a ULA(IC1)chip from either a ... 's broken(other than the ULA), please give me a shout ... -
TimingHey All, Is their away of obtaining timing information on ZX128k other than addresses 23672->23674. Basically I would like to identify every 100th …
... /> Is their away of obtaining timing information on ZX128k other than ... -
Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…
... the inner workings of the ULA can comment on this.
timing etc., I quickly arrived at ... -
ULA schematicsHi everyone. Some while ago I remember getting hold of some circuit schematics of the innards of the Speccy 48K ULA. Sadly I've since lost the files…
... innards of the Speccy 48K ULA. Sadly I've since lost ... -
ULA?Just curious, what does ULA stand for - I'm guessing Ultra Large (Gate) Array?
Just curious, what does ULA stand for - I'm guessing Ultra Large (Gate) Array? -
The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …
... is controlled.
The ULA controls output to the the ... need to change the ROM,ULA and add more RAM ?? or ... -
sound input causing dead ula in +2 ?I have a dead +2a (it shows static black screen, no border see: [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=9619&forum=4)"]http:/…
... /> I started to think why ula suddenly broke. 'Deadth' posted ... connected tape leads can damage ula.
Also found ... 1b652469b2ff16c9?lnk=st&q=ula&rnum=18#1b652469b2ff16c9"]http ... 1b652469b2ff16c9?lnk=st&q=ula&rnum=18#1b652469b2ff16c9[/ ... -
Games that use multicolour effectsMulticolour (which created via ula timing, not screen switching) is the only functional effect that ULA can do. It's the only way to break colour cla…
Multicolour (which created via ula timing, not screen switching) is the ... only functional effect that ULA can do. It's the ... .
But it's timing dependant structure stricts their use ... -
New Spectrum emulator for DS[url]http://zxds.raxoft.cz/[/url] [quote]Features already implemented: * Solid Z80 core - possible bugs aside, the Z80 emulation is as complete…
... emulator with reasonably precise T timing and with enough speed to ... lines at the times the ULA would read them. It looks ... -
Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…
... can't go looking for timing issues with M1 (for the ... shows it coming from the ULA. -
ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
Hi.
Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ?
Also looking for one 7805 heatsink...
Thank -
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.
I 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. -
Spectrum ULAHi new to forum ,and have been a speccy owner/fan since the begining{like most 30 somthins on this forum !) Anyway what i want to know is the ULA th…
... want to know is the ULA the same from issue 3 ... -
Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…
... Spectrum clone now shows full timing compatibility
with the ZX ... ! 8-)
Both the ULA IO and memory contentions are ... -
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…
... and CAS generated from ULA? I think there may ... Ramsoft incorrectly states that ULA doesn't stop CPU ... [LIST=1]
[*]The ULA address drivers do not open ... I'm curious what exactly ULA is doing then.
... reading from it by ULA. The address while bytefetch ... -
Serching for ZX printer ULA and ZX interface I ULAIs there anyone having any spares. In both cases, I swapped ULA's from working equipment which fixed things, so I'm 100% sure it's the ULA that is ca…
Is there anyone having any spares. In both cases, I swapped ULA's from working equipment which fixed things, so I'm 100% sure it's the ULA that is causing the problem.
Is there anyone who can help? -
ULA Book - Target Audience?This is probably of most intrerest to hardware chaps, but a greater community input would be good. I've been turning all my ULA analysis into a love…
... been turning all my ULA analysis into a lovely ... "The Sinclair ZX Spectrum ULA". I'm doing this ... time as creating a complete ULA replacement, so effort is ... features of the machine the ULA encapsulates.
Do I ... the specifics of the ULA internals, it's going ...
