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Hardware description - MB-02+ interfaceOn this thread will soon released info about MB-02+ idisk interface ( memory paging mechanism, list of ports, addressing, MB IDE, schematics, etc... …
... 02+ use own external DMA chip (type UA828D = clone of ... in ZX) and DMA chip transfer blocks of data ... chip can send data block from ZX ram to ULA port ... to videoram(slow ram) ULA chip slow down DMA transfer because ... is slow down by ULA chip but is faster than ... -
Didaktik Gama and M manualsI?m looking for manuals for the Czech Spectrum clones Didaktik Gama and M. Thought this would be an easy task, but I couldn?t find any user or servic…
... with three 8bit gates. PIO chip use ports 31,63 and ... Gama 80k. DG80 use original ULA chip from ZX Spectrum.
ULA". Functionality is same as ZX48kB ... and TV + VIDEO out. Square ULA chip contain RGB output, then is ... -
48k of my youthSooo, So I finnaly had a few minutes to spent around in the 48k. I opened the box for a quick inspection, mainly to check on the version and to see…
... to be the 6C001-7 ULA chip only (according to Planet Sinclair ... -
When is a 16k not a 16k ?Can anyone explain what this machine is supposed to be ? Speccy with a 16K sticker on the base. Doing a peek 23733 returns 255 so a 48K ? Opened …
... surprised to see that particular ULA chip fitted if it's as ... -
spectrum issue 6a oddityMorning everyone Bought a speccy (rubber key) from ebay in near mint condition - couldn't tune in on analogue particularly well so did the comp mod …
1.Check connectors and cable, and the solder.
2.Try to change ULA chip from other working ZX. -
ZX Spectrum 48k - no CLK signalHello I'm trying to repair ZX Spectrum 48 mainboard issue 3B. When i check signal with oscilloscope on X1 or on ULA pin 39. I get stable 2V no clock…
[QUOTE=gottrek;735246]Can broken ULA chip be the cause of no ... -
Overclock the Z80 cpu to smooth out gameplay?Was thinking today of a Genesis/Megadrive mod I did a while back. It involved lifting the CLK leg on the motorola 68000 cpu (which in the MD, if I r…
... video timing (realized by the ULA chip) are special related to each ... source than that of the ULA even if it would be ... . The RAM chips and the ULA chip maybe damaged by such modification ... -
BAS-ROM for HarlequinSince it is very easy for everybody to plug a new BAS-ROM into his Harlequin there is the question, what kind of ROM and what additional functions sh…
... well as to replace the ULA chip, which is not in production ... -
BAS-ROM for HarlequinSince it is very easy for everybody to plug a new BAS-ROM into his Harlequin there is the question, what kind of ROM and what additional functions sh…
... discrete logic instead of a ULA.
[quote]The Harlequin ... well as to replace the ULA chip, which is not in production ... be possible to replace the ULA chip in existing machines. It would ... -
Spectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…
... , since you have TV picture, ULA chip is probably ok. But because ... : if you short a RAM chip data output line to ground ... , that might be the faulty chip you are looking for.
ULA chip with wrong memory decoding (generating ... -
Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…
... out to be a faulty ULA chip. Mutant Caterpillar fixed it for ... -
Spectrum 48k ProblemsHi all Got my 48k today but it's playing up abit... First time i turn it on it was like this: [IMG]http://s26.postimg.org/hlg9d3f3d/IMG_20140830_…
They will be between the ULA chip and the mic/ear sockets - ... -
ZX81 and Analogue TVsI recently bought a really nice ZX81 on ebay in amazing condition, but I'm having issues tuning in an old analogue TV to lock onto the signal. I und…
... , but how about changing the ULA chip to one that's more ... -
ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…
Thanks guys :)
At the moment my '81 is just a bare board needing a new ULA chip and a socket. I will keep you all informed as to progress :)
I appreciate all the help and advice (bows head) -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... be correct wiring for genuine ULA chip behaviour?
This can be ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... to a ULA. But a Spectrum-on-a-Chip is definitely ... the logic onto one ULA chip (or in the zx80 ... machine on the FPGA chip. The programming refers to ... the configuration of the chip. It is exactly analogous ... between parts on the FPGA chip. The 'programming' being ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... suddenly 'become' the Spectrum ULA. An FPGA doesn't ... to a ULA. But a Spectrum-on-a-Chip is definitely ... to configure or "program" the chip.
Would ... the way that each chip is connected that that ... that uses a Z80 chip, a ULA chip, 4116 DRAM chips ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... will usually single out the ULA as being what makes it ... the exact die of the ULA chip for it to be a ... -
48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... you're not convinced the ULA is sound.
You ... />
Try a KNOWN GOOD ULA chip - don't guess.
rip Michele FerreroNo not from a 70s band. But the bloke behind ferrero rochers and nutella.
[QUOTE]So here's a challenge, can be find a concrete link between Ferrero and the ZX Spectrum[/QUOTE]
Actually didn't Ferrero or something like that manufactured ULA chip for Spectrum? :prip Michele FerreroNo not from a 70s band. But the bloke behind ferrero rochers and nutella.
[QUOTE=Ralf;818971]Actually didn't Ferrero or something like that manufactured ULA chip for Spectrum? :p[/QUOTE]
Hah, yeah, there's been a couple of good jokes in this thread after all. ;)Interface 1 repair?Can the Interface 1 be repaired? The problem is that it is not recognised by (several) Spectrums, including ones that it worked on the last time I t…
... and specialised knowledge. If the ULA chip is 15 quid, then really ...Windows10 compatible emulatorsOh no and damn and blast and other expressions of that nature. SPIN just doesn't like Windows 10. Zero was next choice and that wont run at all. Fu…
There's too many games for the Spectrum, why can't you all work together to produce the perfect game....Windows10 compatible emulatorsOh no and damn and blast and other expressions of that nature. SPIN just doesn't like Windows 10. Zero was next choice and that wont run at all. Fu…
[quote="1024MAK;843806"]There's too many games for the Spectrum, why can't you all work together to produce the perfect game....
[/quote]
Not every game is trying to be the same though (in the main) its like having hundreds ...Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... checked each leg of each chip on the lower and ... the ULA, not sure whether you meant the socket or chip ... did both:
[b]ULA chip to GND[/b]
A0 ... 24.1
[b]ULA chip to 5v[/b]
A0 ... .6
[b]ULA socket to GND[/b]
Dead issue 3b with black and white barsHi all, I've been donated an issue 3b which has some nice black and white bars with a few flashing blocks. I've done a few RAM tests and could spo…
... (might help! :) )
[b]ULA chip to GND[/b]
A0 ... 24.1k
[b]ULA chip to 5v[/b]
A0 ... -15.6k
[b]ULA socket to GND[/b]
[b]
ULA socket to 5v[/b]
Jiiira's Sparrow LITEHi All, Just for info .. :) big eprom, cheap 32KB ram and etc. i don't know specification .. :) https://youtu.be/NbI7E1aebrM modern speccy .. …
...
It requires original ULA chip (supported are most common versions ... RAM is in single SRAM chip
- the main ... also in (another) single SRAM chip
- the system ... now realized by small CPLD chip from Altera, instead of ...Kempston joystick - port MSB value?In a situation where let's say the kempston is being polled like this: LD BC,NN1F: IN A,(C), what is the 'correct' value of NN? 1. 00 2. FF 3. S…
ULA chip in ZX can slowdown some ... interrupt because in this time ULA chip don't slowdown CPU and ...help with broken +2 greyHello, the other day I was trying to record sounds from my grey +2 "sound" socket to an old cassette recorder. Suddenly the screen went to a solid…
If this was a black +2/3 I'd tell you to think about changing the ULA chip - not sure about a grey +2 though...AY volume on original 128k & grey +2 machines questionI loaded up Rick Dangerous tonight on my original grey +2 which reminded me of something that I've been meaning to ask for ages. Why do some games…
... of the ULA audio output compared to the AY chip on the ... AY output, not the actual ULA chip output itself.
You ...
