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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 ... a spare parts machine and not waste my time? All ... -
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 …
... , sometimes it reads ok sometimes not.
Just wondering if ... its worth replacing the ULA in it, and whats the ... a look. I have a ULA chip about the place.
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…
... re not sure.
The content not only documents the ULA circuit ... full details of the Ferranti ULA range, images of the 6C001 ... ULA internals, both optical and ... technology that was the Ferranti ULA, or the principles and techniques ...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.
... scans on WOS are not at a high enough ... from the top of the ULA - and Sinclair may have ...
The earliest issue 1 ULA datecode I have is 8217 ...ula bookula book is here: [url]http://www.zxdesign.info/book/[/url] can i post sam coupe stuff here - she kind of is a speccy if you stuff the speccy rom i…
... the ula book and this is not described as ula snow ... is that not possible
not with regard to ... earlier email working - though not quite
in fact ... and external ram is not internal rom speed as ... the orgininal cpc had(not the cpc+ which had ...PoC for a ULA video generator described using Handel-C and a Basys FPGA board.Recently, I've taken a course about hardware design for video processing using FPGA's. The HDL used in the course was Handel-C, a C look alike langua…
... description of the ULA behaviour when generating video (not accurate timmings, as ... of 14MHz of the original ULA) .
The result is ... : one of them is the ULA video generation FSM, which in ...+3 ULA question.I have a +3 and a DivIDE+ unit. Another user has suggested that the reason the DivIDE+ doesn't work on the +3 is that the ULA may be dud. I have trie…
... the +3 is that the ULA may be dud. I have ... +3 ULA from? I have been told 48K ULAs do not work ... in a +3, what about 128K ULA or +2 ULA?Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…
... Spectaculator, and it seems that not in Fuse too.
not floating bus (ULA/FFh), of a mirror ... ]
The results are not the same I got from ...Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... read a bit in the ULA+ for test if supported. And ... )
2. If is not supported, use 2 pixel step ... bits of displacement, and the ULA start the frame with the ... end of the line the not used pixel at the start ...ZX81 Dark screen, could it be the ULA?Trying to get a ZX81 going for a mate of mine, already replaced the membrane (Cheers Rich!) but now its the old "very dark screen" problem, probably …
... " problem, probably caused by the ULA and fixable with the composite ... be a damaged ULA that his mod may not fix, could this ...Slightlt OT. - ZX81 ULA Modulescomming soon... ZX81 ULA module. Plugs into original ula socket, provides composite video output (requires vwry small mod to bypass UHF Modulator, b…
... .
Plugs into original ula socket, provides composite video output ... 50Hz
4. switchable M!not mod
5. turbo mode ... constant 3.25Mhz from the ULA to your sound card (or ...Can anyone test my Issue 2 ULA?Hi guys, Could anyone with a Issue 2 Speccy try whether my ULA works in theirs? I will obviously cover postage etc. Just want to know whether I have…
Hi guys,
Could anyone with a Issue 2 Speccy try whether my ULA works in theirs? I will obviously cover postage etc. Just want to know whether I have a faulty ULA or not before trying to source one from somewhere.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…
... works perfectly with a 5C112E ULA. I have just been testing ... whatever their native (version 6) ULA happened to be.
ULA must sometimes wrongly read from ... the errant pixels would not flicker. I have not yet determined whether ...Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
Well, at least not in any emulator I've ... problem in emulators, unlike the ULA snow effect which can be ... between $C0 and $FF, the ULA gets confused and crashes can ...ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…
How is this feature implemented in emulators ? And how exact is the emulation ?
I somehow supposed that ULA snow is something that is not very deterministic in nature. But if one can emulate it (perfectly ?) then i was wrong.Microdrive units with weak (not dead) ULAs...Hi everybody, I've got a Microdrive unit here. It didn't work. It does now (actually, it was the ribbon had broken and the ground had lost contact, …
... kept spinning as the ULA never told it to ... Microdrive is working. However, not fully. When I format a ... /> I also have another ULA that exhibits similar behaviour - ... we can get this poor ULA back up to speed? ... signal before going into the ULA. It's the output ...Experiments mixing ULA+ and Timex Hicolour featuresI'm trying to improve my Verilog skills, so I've written a description of a complete ZX Spectrum 128K (+2 grey ROMs), with AY-3-8912. I wanted to add…
... -8912. I wanted to add ULA+ support, and in the way ... been used to implement the ULA+ palette registers.
I ... from the RGB 1084 monitor, not an emulated rendition)
ULA+ page, if you wish ...ZX Spectrum ULA core available at OpenCoresHi! On April, 23th, I opened a new project at the OpenCores website: [url]http://opencores.org/project,zx_ula,Overview[/url] Right now, it has a, h…
... , hopefully, complete description of the ULA chip, written in Verilog, and ... )
Video output is not VGA, but original PAL RGB ... on it to act as ULA, with a true Z80 and ... way I hope to tune ULA timmings in case there's ...Seems my DivIDE is not working.I recently received a DivIDE kit. Built it up, then tried it. I got a hung up Spectrum and I noticed that I had made a mistake. I swapped a LS245 wit…
... to flash firmare (I'm not certain the was any firmware ... /> 1) 10MB Psion - detected on ide-cf converter, not on DivIDE and ... of 1 GB - detected on ide-cf converter, not on DivIDE and ...ULA bug and snowI am tryng to improve the snow emulation in FBZX wii but I do not have a real spectrum to test the results. I used the information taken from Harele…
... FBZX wii but I do not have a real spectrum to ... emultor is writing in the ULA video register the second screen ... the four byte fetch is not get latched into the RAM ...128k +2 (grey) Ear mod - New ULA and still problemsBverstee kindly sold me a 128K ula since the one in my +2 seemed to have a broken ear in. But even with the new ULA, I still can not load games throu…
... kindly sold me a 128K ula since the one in my ... even with the new ULA, I still can not load games through ... ZX tapes so I can not even test if it can ...Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…
... 3.5MHz clock as the ULA generates it internally, and ... nicely. The phase error is detected and the regen_specclk frequency is ... in perfect sync with the ULA only about halfway across putting ... frame buffer into another - absolutely not. Even with the most closely ...Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... ULA chips.
After a bit of searching, I am not ... sure whether any ZX Spectrum ULA can be used ... whether each issue has specific ULA chip requirements. I'd be ... before heading down the new ULA route.
Cheers,
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…
... ): [COLOR="Red"]NOT OK[/COLOR] - SD card was never detected (caused by ... +2 use the same ULA, but this ULA is very different from ... the 48K ULA.
Allthough the ... grey +2 does NOT come directly from the ULA.
It first ...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 ... memory address generated by the ULA (who wants to read ... two addresses. Therefore the ULA reads the data from an ... is actually read by the ULA is the following:
ULA is busy drawing the border and it does not read ...Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... but the computer would not accept any commands from ... Keyboard membrane, or IC1 (the ULA chip).
... am not sure what the signs of a faulty ULA ... Bay but have not seen any replacement ULA chips. In the ... cannot remember exactly what ULA is on the board ...ULA 6C001EX-7Last night I visited a friend of mine and had a look at the ULAs in his Spectrums. He has a 5C102E 8220 in a 16K issue one, a 5C112E 8237 in a 16K is…
... issue one (definitely a replacement ULA, there was evidence of where ... />
He also had a ULA I had never seen before ... -7, a font I had not seen before on Ferranti ULAs ...5C series NTSC ULA 5C114E 8248Not sure if this has been mentioned before; I haven't seen anything about it online. Chris Smith's book discusses 6C011E as the NTSC ULA sold in Spec…
Not sure if this has been ... discusses 6C011E as the NTSC ULA sold in Spectrums in Chile ... Issue 3 style 6C series ULA.
Here we have ... much earlier 5C series NTSC ULA, in a Spectrum with a ... time the 5C112E-2 PAL ULA was being made.
My attempt to restore the CPU clock signalI know Winston has already got this, but I can't see any thread with details about it. Only wanted to share my (still early) results. I'm not taking…
... .
I'm not taking about reshaping the ugly ... signal, filling the gaps where ULA stops it, and yet, ... br />
I'm not familiar with the use of ... well (because it is not interrupted while the IN/OUT ... in sync with the internal ULA and the CPU, without ...
