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ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... board for testing 4116 chips , ULA , Z80 and Rom chips . For example ... -
Spectrum 128k advice neededHi, I'm new to this forum and the spectrum world. I have this spectrum "toastrack" that was working fine until today. It doesn't boot anymore, it s…
... /> All other tests seems fine, ULA, Z80, etc.
Sorry for ... -
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…
... ), changed for a more relaxed thermal ambient the lm7805 with a ... noticed that Ula is very hot and the Nec Z80 is hot ... for fetishism I added to Ula and Z80 two mini heatsinks like ... -
Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…
... is needed. (My hot air gun is an electric paint stripper ... s actually at the perfect temperature for this...and it's ... is generated by the ULA, Chris Smith's ULA book shows it ... down on top of the Z80 with its legs in the ... and GND pins of the Z80 on which it lies.
Using a thermal camera to fix speccy's.Hi All, Thought I'd share another repair... Got a board that collapsed the bench supply straight away ( I run a bench supply and give it just enou…
... so I pulled out the thermal camera ( they cost about 150 ... . The ULA can be seen below them, and the Z80 to the ... time I've used a thermal camera to identify and locate ...Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…
... thermal related fault. Last night, i quickly replaced ula, rom, z80 ... the heat sink and the ula were abnormaly hot.
... had something to do with temperature. (Or something caused a ... stressed component fails under some temperature, like DEATH stated.)
...Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..
Hi,
Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?
I mean which Z80 clock cycle, T1 or T2?
Thanks..Blowtorch method of Speccy repairsI just did my first Spectrum repair (and successful at that). It was the Issue 2 spectrum I wrote about a while ago, I just hadn't got around to doin…
... &Q electric paint stripping gun.
I ... signal lines on the Z80 were doing the right ... />
I removed the ULA. The fact this chip is ... the trusty paint stripping gun, which I switched on ... fails again). I replaced the ULA, plugged it in... and ...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…
... that Ramsoft incorrectly states that ULA doesn't stop CPU when ... :
[LIST=1]
[*]The ULA address drivers do not open ... Zilog introduced refresh cycle in Z80 as it helps in refreshing ... constantly reading from it by ULA. The address while bytefetch is ...SENDING beeper music from Z80 to AY?Hello. According to [url]http://z80.e-demo.pl/[/url] Z80 sends music-data to ULA (the 1-bit transducer). I was wondering if it's possible to send…
... -demo.pl/[/url] Z80 sends music-data to ULA (the 1-bit ... data to AY (instead of ULA).
At first, to make ... with 3 channels digital music. Z80 can send it to beeper ... with chiptune/synthetic music from Z80. Is it possible to use ...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…
... "The Sinclair ZX Spectrum ULA". I'm doing this ... time as creating a complete ULA replacement, so effort is ... the Specturm (RAM, ROM, Z80 etc). This might be ... features of the machine the ULA encapsulates.
Do ... the specifics of the ULA internals, it's going ...A good site with Z80 ZX Spectrum 48K tunesI found this good site; [url]http://z80.e-demo.pl/[/url] ; I listened to a few tunes yet, and I am [B]AMAZED![/B][B]To me it sounds WAY BETTER THAN A…
... this good site; [url]http://z80.e-demo.pl/[/url] ; I ... add a second dedicated Z80 chip and ULA for beeper and so ... be if there were two Z80 and ULA chips that would provide ...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 ... to be cooled below room temperature to work right.
< ... measuring the signals of the ULA I found out that ... the RAS pin of the ULA. Finally I placed a ... even if I heated the ULA with a hair dryer.
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 …
... state that the ULA halts the Z80 by forcing CLK ... period, the time that ULA is reading video data. ... put a Z804020 CPU (Z80 capable of 20MHz clock), ... signal generated by the ULA for the TEA2000. Should ... , internal timmings at the ULA, which is the responsible ...Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …
... forum regarding... a dead ULA, but only a partially dead ... .
"Another ULA knackered!" I thought...but... how ... working, the ULA isn't selected by the Z80 and the ... to say the Z80 could write to the ULA, so the ... bus for the Z80, not the ULA's side of ...+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 ULA may be dud. I have tried a new Z80 and ... can get a replcaement +3 ULA from? I have been told ... a +3, what about 128K ULA or +2 ...Is ZX80 really "Z80 only"?The Spectrum has ULA to generate video display. Does the ZX 80 have any kind of processing chips apart from Z80? How is the video display generated o…
The Spectrum has ULA to generate video display. Does the ZX 80 have any kind of processing chips apart from Z80? How is the video display generated on ZX80? How does it compare to Atari 2600's CPU + TIA combo?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 ... clones using: this core, a Z80 Verilog core, and some other ... it to act as ULA, with a true Z80 and true separate ... way I hope to tune ULA timmings in case there's ...Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…
... of the Z80, or are they instigated via the ULA? Are Speccy ...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…
... emultor is writing in the ULA video register the second screen ... byte it checks if the Z80 is in the 4th cycle ...WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... replacement for the Sinclair ULA chip fitted in ... originally generated by the ULA are not present here ... multiplexer outputs from the Z80 side are higher. Hope ... to prevent the replacement ULA to touch the upper ... My griddle has not a temperature knob, but a power ...Lot's of ZX Spectrum parts: RAM chips, ULA's, etcI have new stock of 100% tested parts. I even got my hands on a bunch of ULA's!! [IMG]http://benophetinternet.nl/hobby/sales/parts/IMG_6068.JPG[/IMG…
... hands on a bunch of ULA's!!
[IMG]http ... ]
- 48K / 128K ULA
- Zilog Z80 3.5 MHz
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…
... refresh cycles of the Z80 (performed during each instruction ... address generated by the ULA (who wants to read ... two addresses. Therefore the ULA reads the data from ... of the Z80
The ULA reads a ... After that 128T, the ULA is busy drawing the border ...doubt about swapping ULA in an issue 2 boardIs it possible to swap a 6C001E-6 ULA type with a 5C112E ? I have this issue 2 board that is not booting, it shows me a black border with horizont…
... a CPU problem, or ULA.
Diagnostic ROM doesn ... the ULA and Z80 to narrow the problem.
Z80 is ... to try swapping the ULA as I have another ... transistor mod on the Z80, the working machine has ... diode/resistor mod on the Z80.
Thanks
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... :
Change the ULA.
If no ... modulator swop, recheck the ULA and change TR1/2 ... replace with BC547) if ULA ok. Change the LM1889 ... hot air paint stripping gun to melt the solder. ... br /> Test and replace the Z80. Fit a socket!
< ...toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... you haven't damaged those ULA chips.
... :
Change the ULA.
If no ... modulator swop, recheck the ULA and change TR1/2 ... hot air paint stripping gun to melt the solder. ...
Test and replace the Z80. Fit a socket!
< ...I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…
... like the CPU and ULA to suffer SCR latchup ... .
The ULA is a bit of a ... Spectrum project - not a ULA replacement, but for a CP2200 ... can get a brand new Z80 - they are still manufactured. ... The 7805 has built in thermal and overcurrent protection. They ...User reviewsAs often requested (e.g. [URL="http://www.worldofspectrum.org/forums/showthread.php?t=18135"]here[/URL]), user reviews are now possible through the s…
... Stains;335472]After the Z80 acknowledges an interrupt and enters ... service routine, if the ULA is still asserting the / ... EI opcode then the Z80 will accept a second ... to do with Top Gun freezing on that particular ... can't imagine Top Gun doing anything fancy at ...NEC CPU - problem?I wonder if I should substitute a NEC CPU in a grey +2. Does anyone else had problems with NEC CPUs inside ZX Spectrum. Some time ago I had a Spectr…
... assembled using a hot air gun and solder paste.
Use a hot air gun that reaches 260 celcius or ... paint stripping gun. The hotter the gun the further ... so getting it up to temperature.
Once ... melt then extract the Z80 with pliers from the ...damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
... B&Q electric heat gun (for paint stripping) on ... is pretty much the perfect temperature for the job. I ... />
Secondly, remove the ULA. The only reason I can ... can bring the hot air gun closer. You should take ... . I find with my gun, when you get it ...
