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Heatsink for ULAHi, My Speccy 48k issue 4s starts to get temperamental when it's been on for a while. Machine itself is fine but loading gradually becomes more unre…
... unreliable to the point of not working at all after 40 ... chum on Twitter suggested the ULA might be getting hot.
ULA might cure it? Question is ... put a heatsink on their ULA?
Cheers ... -
ZX81 ULA Swap questionHi Can someone remind me if all three versions of the ZX81 ULA are electrically compatible? I just bought a ZX81 with an older ULA, so it lacks the …
... three versions of the ZX81 ULA are electrically compatible? I just ... a ZX81 with an older ULA, so it lacks the backporch ... happen to have a good ULA 2C210E. Can I simply swap ... been years and I am not 100% sure about whether there ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... video modulator ripped out , the ULA and ROM missing as well ... a label , and one does not. Really these are quite interesting ... and used until they were not needed . But stuff like this ... -
ULAAre ULA's (for Spectrum 48k's) interchangeable through the different issues? To give some background, to work out what was wrong with an old speccy I…
Are ULA's (for Spectrum 48k's) ... , I tried an issue 3 ula in an issue 2 board ... ULA was then placed back in it's original board seemingly not ... -
Help: Not loading anythingBought a ZX Spectrum +, having some problems with it. The ear is not working at all, not even a searching tone (not sure of the correct terminology) …
... . The ear is not working at all, not even a searching tone ... (not sure of the correct ... as possible), if not the IC1 (which is the ULA), this means ... -
48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…
... one appears to start, but not finish the RAM test. The ... IC6-13 appear close, but not quite right, some are 0 ... don't get warm, although ULA and CPU do... Is this ... -
ULA 1E7 in 3B board?Hi all. Any comments on the following would be appreciated. I have an issue 4a and an issue 3b Spectrum. While having a look around inside the 3b …
... it has the same model ULA.
Having read ... onwards which had the 7 ULA, whereas the 3b should ... me has just changed the ULA?
What's ... that I understand the 7 ULA may generate a clearer ... it up to standard (currently not good) as it may ... -
New version emulator ZEsarUX 3.1Hi I have uploaded a new version of my emulator ZEsarUX on http://sourceforge.net/projects/zesarux I have improved accessibility support, no…
... for all video drivers, not only stdout. It makes ... Mode 6 (512x192 monochrome) is not emulated yet (doing 256x192 monochrome ... quickexit
Fixed Inves ULA Colour Delay. It only affects ... a custom loader routine is detected and reinserted the tape ... -
Keyboard issues. Select keys not working.Hi Guys, Well it seams problems are like buses, you wait awhile, nothing turns up, then a couple at once. I have just got one issue 2 48k going…
... the ULA in such situations. Man I hope I am not witnessing ... the demise of two ULA's in ... -
ZX-Paintbrush and global palette and ula+ supportHello, I think I need some help for the palette issue of ZX-Paintbrush. I want to check whether the way I'm about to clear the palette handling i…
... ula+ feature.
Selecting one of the 4 global palettes does not ... /> Changing the colours does not change the other 3 palettes ... user activates ula+ feature (by opening the ula+ palette editor ... the new option "Deactivate ula+ palette". This switches back ... -
No CLK on issue 2 ULA pin 32I'm trying to fix an issue 2. The symptoms are as follows:- Black and white bars on screen, colours near impossible to tune in, although these po…
... chips.
It will not pick up any interfaces, so ... of CLK on the ULA, but the ULA's I'm using ... .
Working back from the ULA I tested and changes the ... it looks like a resistor not a diode. see post below ... -
New colour palette for 16K/48K/+ machines, based on ULA YUV voltagesI’ve made a colour palette for 16K/48K/+ machines, based on the YUV voltage tables in Chris Smith’s book The ZX Spectrum ULA. This colour palette …
... ’s book The ZX Spectrum ULA.
This colour palette ... Sinclair Ferranti ULA, 5C102E, 5C112E or 6C001E. It is not suitable for ... -
Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…
... on the emitter. The ULA was also getting hotter ... SMART card interface. It detected the 2 previously replaced ... noticed the beeper was not working either. So next ... . Strangely the beeper was not working again, and I ... I tried swapping the ULA with a known working ... -
Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …
... and VR2 - which is not very practical when the Speccy ... the digital TV does not like the Speccy's ... level of the signals is not correct (the voltage between ... book "The ZX Spectrum ULA: How to design a ... /> Patrick
My ULA Y output:
[img]https ... -
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…
... to swap a 6C001E-6 ULA type with a 5C112E ?< ... issue 2 board that is not booting, it shows me a ... suspecting a CPU problem, or ULA.
Diagnostic ROM doesn't ... would like to swap the ULA and Z80 to narrow ... like to try swapping the ULA as I have another working ... -
zx spectrum 48k issue 6A boot fail- black paperohh whats wrong with this poor specie .. boot fail,, border white & paper black .. when reset it shows the red lines to indicate that the CPU is cycl…
... CPU using a arduino which detected the 3.4 mhz clock ... request) it detected noting.. tried a known working -7 type ULA. checked ... it is data bus problem not addressing so unlightly to be ... -
Interface 1 ULAIs there a technical description of the functionality of the Interface 1 ULA, similar to the "The ZX Spectrum ULA" book? Specifically, what is the…
... functionality of the Interface 1 ULA, similar to the "The ZX ... Spectrum ULA" book?
Specifically, what ... the ROMEN lines of the ULA? Superficially, ROMCS feeds into the ... cases would ROMCS and ROMEN not be both active/inactive at ... -
Spectrum problemHi I've just been trying to resurrect my 48k spectrum. I'm having some problems loading some of my games, but if it does completely load, it crashe…
... the fault-candidates, like CPU, ULA, and the lower 16k of ... case, whether or not the fault can be detected clearly, substituting the ... load, or load but do not work, crash after a while ... , which might indeed affect the ULA or the CPU. -
Election of the new maintainer of the TZX formatHi folks, the topic says all, let the discussion begin :) Luca
... of games that are not working with ZX Interface ... works with If1 or not, so the TZX creators ... block, I still do not fully understand where's the ... to determine if the edge detected though the $FE port ... is perfectly available from the ULA, and some loaders will ... -
Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... - for instance the Spectrum's ULA only looks for A0 being ... logic 0 (so the ULA responds to every single even ... respond only to OUT instructions, not IN instructions). The other chip ... flop when the pulse is detected for later reading etc.)
Tape loadersi understand how ROM tape loader works but i dont understand why it so 'complicated'. it measure time until two edges in signal appears. why it does…
... the state of the ULA - which does not output edges, but levels ... the save routine does), the ULA's output always starts at ... out, not what state the previous bit left the ULA's output ... result in edges not being detected and the clock not being recovered of ...Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …
... A ("vertical retrace") when the ULA doesn't output anything. This ... /PAPER rasterisation).[/quote]
Not quite true. Write a unique ... bus until that value is detected. Won't work on anything ...More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... impressive I'm sure, just not very Spectrumlike.[/QUOTE]
ULA as well when all 64 ... based on whether ULAplus is detected. Otherwise even if you zeroed ...Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…
... the cockroach does, but not why it does do ... internally by mistake, the ULA didn't apply enough ... an IO instruction is detected (the IOREQ line is ... passed through when it is not active).
... timing compatibility, the later ULA versions had to keep ...BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…
... detected
(NOTE : MY loading scheme can not ... of those fluctuations are not noticeable to human ears, ... to ECC and error detected (no audio signal, ... 48000 = 72.9166666 (it's not perfect)
but
... KHz. I not add contention of ULA in this test ...SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... based on whether ULAplus is detected or not. If you don't ... the HAM256 viewer I'm not aware of any ULAplus software ... in in place of the ULA.telling the difference between speccysSorry for sounding like a dunce. ive seen a rubber keyed speccy in a local retro shop. How can i tell if its a 48k or 16k model without switching it …
... can be detected by weighing. But that probably is not allowed too ... spectrum that is offered as 'not tested' should be regarded as ... 16K machine from which the ULA chip already is removed. Or ... good reasons for not testing, one wonders how these were ever detected.Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…
... caps and keys with sym. Detected keys are mapped to key ... inside Amstrad's keyboard and ULA ASIC which helped reduce the ... store current downed keys. If detected keys at next scan are ... device open, and skip if not. That leaves more processing time ...Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…
... />
I'm not so interested in the stacked ... that's the data bus, not the address bus. As ... address 0x7fff whilst the ULA is drawing the screen ... This would be quite easily detected from software and is ... I would think that not much software really relies ...Testing an Interface 1As title, is there an easy way on how can I test to see if its functional or not please ? :) Please bear in mind I do not have *any* microdrives n…
... recall a faulty Z80 or ULA can make it appear broken ... ROM. Faulty M1 would not be detected on the Spectrum without IF1 ... 't know about the faulty ULA, but I would say faulty ... ULA will cause much more problems ...
