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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…
... 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? -
Fuse for Mac OS X 0.9.0 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project and shortly here on WoS: [url]http://sourceforge.net/proje…
... emulation (Q-Master).
[*] Fix contention for LD?R, CP?R ... , as the +2A/+3 ULA applies contention only when MREQ is active ... -
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 ... -
Wanted: RGB SCART cable for heatsink 128K and ULA for issue 3 ZX SpectrumHi all, I'm after an RGB SCART cable for a heatsink 128K as well as a replacement ULA for an issue 3 ZX Spectrum (Ferranti ULA from memory). Can an…
... as well as a replacement ULA for an issue 3 ZX ... Spectrum (Ferranti ULA from memory). Can anyone help ... -
ULA Replacement WORKS !Hi chaps. Lots of activity over the last couple of weeks, and _finally_ we have [B]a working ULA replacement[/B] !! The analogue components such …
... we have [B]a working ULA replacement[/B] !!
The ... -
Timing... in the CSS faqI was looking at the CSS faq for something completely unrelated and noticed: [quote] Then the 192 screen+border lines are displayed, followed by 56 …
... placing a cooler onto the ULA has been observed to remove ... vary slightly with temperature. The ULA dissipating heat into the PCB ... period of time. Preventing the ULA from getting as warm as ... -
Fuse for Mac OS X 0.10.0 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project and shortly here on WoS: [url]http://sourceforge.net/proje…
... (but probably not perfect) TS2068 contention (Philip Kendall).
[*] Various other ... Meunier).
[*] Tweak TS2068 display timing (Fredrick Meunier).
[*] Fix crash ... -
Inside the ULAI've recently updated my Blog with the news that I've managed to get inside a 6C001E ULA and have got close up images of the die. I'm currently back-…
... to get inside a 6C001E ULA and have got close up ... -
Spectrum ULA Book AnnouncementFurther to getting inside the ULA, I've turned my ramblings and lab book into a more professional book that you can all own! I'm putting a lot of ef…
Further to getting inside the ULA, I've turned my ramblings ... -
ZX81 ULA 2C210E wantedHello, I'm in need of a working 2C210E (not the earlier 2C184E) ULA chip used on zx81s and Timex1000s. These were sold on ebay for 9 quid each some …
... 2C210E (not the earlier 2C184E) ULA chip used on zx81s and ... -
128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …
... perfectly if I cooled the ULA (with cooling spray). The first ... measuring the signals of the ULA I found out that the ... the RAS pin of the ULA. Finally I placed a 180pF ... ) even if I heated the ULA with a hair dryer.
ULA gets so hot, it is cracked open!Hi everyone. I have bought a rubber-keyed 48K and the seller said he was selling it as "for spares/repair." Sure enough, it turns out it doesn't work…
... took it apart suspecting the ULA was dead. It turned ... I immediately noticed that the ULA had a crack in the ... this time and the ULA started to get so ... gut feeling that replacing the ULA wouldn't fix the ...
What might make an ULA get sooo hot that it ...MicroDrive ULA replacement - best way?I have a mirodrive playing up, odd motor sound, sometimes it reads ok sometimes not. Just wondering if its worth replacing the ULA in it, and whats …
... if its worth replacing the ULA in it, and whats the ... a look. I have a ULA chip about the place.
ULA Schematics CompleteHi all. Just a note to say that I have finally produced some readable schematics for the 48K ULA :-) I've also uploaded a few pages from the book -…
... readable schematics for the 48K ULA :-)
I've also ...Where: ZX Printer ULA's and ZX interface I ULA'sIs there any source left for these ULA's? Alot of tings can be replaced, like the ZTX transistors and occasionally you can come accross a normal ZX S…
Is there any source left for these ULA's? Alot of tings can be replaced, like the ZTX transistors and occasionally you can come accross a normal ZX Spectrum ULA, but I have never seen these anywhere?Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …
... read about contention state that the ULA halts the ... the screen RAM, so contention should be strong here ... period, the time that ULA is reading video data ... signal generated by the ULA for the TEA2000. Should ... internal timmings at the ULA, which is the responsible ...ULA Hacks?During some of my madder experiments back in the 80's I discovered some interesting ULA hacks such as being able to read the raster position through …
... 's I discovered some interesting ULA hacks such as being able ... because I knew that the ULA kept changing and I would ...An idea for a possible(?) new interfaceDue to the Spectrum's processor speed and the way the ULA works, there are a couple things (among others) that are difficult to do: -Gigascreen or a…
... speed and the way the ULA works, there are a couple ... and demos that require specific timing. It would be used only ...Can ULA kill other componentsIn my search for a problem I used a ULA6C001E-7 on a board that had a ULA6C00IE-6 chip. Q1) Should this have worked? Q2) After this experiment both …
ULA equivalent?Gives it an ULA equivalent for the ZX 48K? Or not because the ULA is a custom chip. Micky
Gives it an ULA equivalent for the ZX 48K? Or not because the ULA is a custom chip.
MickyEarliest ULA datecode ??I'm on a mission to find the earliest ULA datecode. Ie, when the first batch of ULA's were manufactured. The earliest picture of the Spectrum circu…
... mission to find the earliest ULA datecode. Ie, when the first ... batch of ULA's were manufactured.
ULA - and Sinclair may have in ... />
The earliest issue 1 ULA datecode I have is 8217 ...48k Timing Tests...Here's v1 of the timing tests for the 48k Spectrum, with a little background [IMG]http://www.zxspectrum4.net/images/timing_test_v1.jpg[/IMG] [URL="…
Here's v1 of the timing tests for the 48k Spectrum, ...ZX 48K issue 4a with ULA 5?I got a ZX 48K PCB. It works but it has a ULA 5. I thought on the issue 4a is a ULA 6 or later. Micky
I got a ZX 48K PCB. It works but it has a ULA 5. I thought on the issue 4a is a ULA 6 or later.
Micky+2A extended memory map & ULA bug?The [URL="http://www.worldofspectrum.org/faq/reference/128kreference.htm"]128K reference page[/URL] says: [quote]The ULA bug which causes snow when I…
... [/URL] says:
[quote]The ULA bug which causes snow when ... .[/quote]
Will the ULA bug appear on the Spectrum ...VCF report and photosNot sure where to put this, exactly...but here it is, what went on at the Vintage Computing Festival at Bletchley Park last weekend. Finally I've fo…
... and faithful to the 48K ULA - all the timings and other ... effects of the ULA are the same.
timing sensitive demo. Chris's stand ...48 Issue 3b working but very hot ula and cpuSalve to everybody I bought from e*ay an Issue 3b 48k , fitted in a + case. Fixed the keyboard problem with a new keyboard membrane from good Rwap (w…
... characters. BUT I noticed that Ula is very hot and the ... for fetishism I added to Ula and Z80 two mini heatsinks ...Issue 2 issue (...)Just acquired an issue 2 Spectrum 48 K, selled as working board, not working keyboard. Before testing it with a psu I opened the case and discovered …
... on z80 side facing the ula) just at the transistor plastic ... Service Manual that, related to ula 5c112 timing problems, speaks about of ...
