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Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…
... 's the advantage (mistery?) behind ULA's spectrum screen memory interpretation ... -
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 ... -
Multiface 128 problemHello everyone i have a 48k plus speccy which i firstly thought was working perfectly. It passed all the test of the official Sinclair test tape (cpu…
... Sinclair test tape (cpu, rom, ula, ram) so i thought it ... -
Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …
... socketed ICs (except for the ULA in the issue 2 Spectrum ... -
128k Page FlippingOver on adverts, AOwen wrote the following: [quote=aowen]The trick, as I understand it, is to redraw the whole screen each time at #c000, but point…
... at #c000, but point the ULA away from the screen you ... /> draw screen 1
point ULA at screen 1
page ... /> draw screen 0
point ULA at screen 0
Point ULA at screen page 1
Point ULA at screen page 0
ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…
... />
- Added much more accurate "ULA snow" and IR contention. Note ...Black paper, white border. Ram fault?We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working o…
We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working one, and we got the same result.
is this a ram fault? How can we check ram chips?Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…
... example.
I changed the ULA with several others to no ...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…
... .
I removed the ULA. The fact this chip is ... fails again). I replaced the ULA, plugged it in... and I ...I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... cycles)
During _reading_ from ULA this can't be right ...TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…
... to the left of the ULA chip (tr6/7 ???? i don ...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…
... lines at the times the ULA would read them. It looks ...It's fitting...... that in the very month that the 25th anniversary of the Speccy falls on, I'm just finishing up making my first ever Spectrum peripheral. It's a …
... might be suspect) or the ULA (which might also be suspect ...Spectrum 48k SeettingGot an issue 2 speccy on the bench that had a poorly ula, changed that, also changed tr4 and tr5 (had no oscillator) now it just resets over and over…
... bench that had a poorly ula, changed that, also changed tr4 ...TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…
... boot. I had tryied the ULA on another machine and it ...Is Ferranti still alive ?And if not......why should there be any restrictions on manufacturing the ULA ?
And if not......why should there be any restrictions on manufacturing the ULA ?Russian clone of ZX-Spectrum 48kThe classic russian clone of ZX-Spectrum 48k [URL="http://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm"]http://sblive.narod.ru/ZX-Spect…
... with simple logical compoments! no ULA chip needed !I wonder if . . .An M68k could emulate a ULA. You know, like the ZX80 used the cpu for rastering the picture on the screen. This would mean that the people who clone…
An M68k could emulate a ULA.
You know, like ...Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…
... I see here is that ULA will no longer access video ... . I can't just remove ULA from the circuit because it ... it possible to disable the ULA's video generation functionality (i ... you disconnect the oscillator from ULA?
Also, can someone ...A Spectrum that fixes itselfWell, the modulator on my 128K toastrack machine fixed itself. It used to drift horribly within the first half hour or so of power up, but now it's a…
... nice toasty warmth of the ULA, and regular use (I only ...Disable onboard memoryWould this work...? Access to onboard I/O can be disabled by holding IORQGE high. Would it be possible to create a MEMRQGE in a similar way to disa…
...
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Z80 MEMRQ +----+--/\/\/\/---+------>ULA, top 32K RAM
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ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …
... output) or a faulty Ferranti ULA chipset?
Unfortunately spectrum ... from tv.
If ULA is the problem does anyone ... know if there are replacement ULA chips?I know that ferranti ... .uk/T34VG1-USSR-Made-of-ULA-Chip-for-Z80-CPU-ZX ...Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…
... active, as the +2A/+3 ULA applies contention only when MREQ ...Home made SinclairsHi, I mentioned in another thread that I had made a ZX Spectrum out of spare parts. If you'd like to see my efforts, I've set up a simple web page o…
... anything clever like make the ULA circuit out of 74-series ...Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... are getting excessively hot. The ULA gets a bit toasty, but ... that was normal anyhow. The ULA is a Ferranti 6c001E7.
Spectrum 128K - Needs Your HelpI have a Spectrum 128K (with the external heatsink on the RHS) it is a 1985 Version 6K mainboard, I got it out of the loft the other day and it wont …
... RAM chips (soldered) and the ULA is marked 7K010E5.
Any ...Spectrum +3 disk drive errorsHello!As i am waiting for the ula chips to fix my spectrum 128+ i received another spectrum +3 i bought from ebay. I changed the drive disk belt as …
... i am waiting for the ula chips to fix my spectrum ...
