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Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... nose here and see what issue board I can offer as ... right hand side of the ULA Chip. So maybe theres no ... -
Lucky or whatYou may have heard of freecycle. [url]www.freecycle.co.uk[/url] Some one the other night offered free Spectrum gear or it will go to the tip. I got…
... screen.
Swapped over the ULA same black screen
Both are 1982 Issue two
The one ... that don`t work is Issue 2 but the Z80 has ... C57.
The other Issue 2 does work but the ... -
Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…
... would be to reduce my 'ULA' implementation onto a CPLD. ... this, as a pure "ULA Clone" would be useful to ... are no shortage of spare ULA chips doing the rounds, ... an issue. A point so obviously shown with the +3 ULA ... likely to be the ULA chip. The ULA in a +3 ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... Spectrums. Behind that falls the ULA (and probably quite a far ... 48k Rubber - issue 3B. I do have another ULA chip I could ... I should try this other ULA first though?
Thanks ...Z80 CPUs goin cheap.This guy is selling them very cheaply and has a couple multi item auctions for them. Thought I would post here in case people were looking for one/so…
... of speccy? e.g. issue 1 issue 2 issue 3, 3B etc.
ULA isnt available new anymore. Winston ...Z80 CPUs goin cheap.This guy is selling them very cheaply and has a couple multi item auctions for them. Thought I would post here in case people were looking for one/so…
... of speccy? e.g. issue 1 issue 2 issue 3, 3B etc.
ULA isnt available new anymore. Winston ...Broken SpectrumsChaps ( & Mrs Death ), I was looking at getting some dynamic ram chips for the next phase of the Harlequin stuff, and I started thinking...... I've…
... , my very first spectrum an issue 3, that I broke whilst ... />
I've got the ULA off one of them and ... /> Anyway, apart from the power issue, I'm sure there are ... on both go get the issue 3 working (the iss4 MB ...MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]
... 3 does not have this issue, as it's all in ... , so no /WAIT issue there, as the ULA doesn't have to ... of this bug/glitch/software issue.
Now on DMA ... there may be a timing issue in the bottom third, not ...MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]
... on +3 ULA
- Wait signal
Timing is issue, on ... synched properly due to +3 ULA. It should be possible only ...Compatible SpectrumsFollowing some recent coding exploits I've been thinking about compatibility of various models of ZX Spectrum. Yes, it's a common question on the for…
... +2? There is also the issue of different contention timings to ... . It's not just an issue with multicolour effects, but any ... perfectly. The +2A and +3 ULA does not stop CPU clock ...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…
... if somebody knows of an issue number I can get it ... /o space though as the ULA only checks if A0=0 ... both your hw and the ULA don't respond at the ...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…
... .
Basically, the ULA is responsible for generating the ... snow.
Summay: ULA generates RAS for the Z80 ... ULA DOES NOT refresh the lower 16K !!!! Mad I know! Issue ... refresh pulses....... So will my ULA replacement ;-) )
Watch ...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…
... least 7.68ms by the ULA! If you sit in a ... the Z80, so neither the ULA or Z80 will be refreshing ... and the resistor disappeared since Issue 3 board.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…
... and the resistor disappeared since Issue 3 board.[/QUOTE]
< ... br /> Interestingly the Issue 4b board has the legend ... />
See 1.3 Modifications - Issue 1 Board, sections (b) and ... both
have the 6C ULA, 6C001e-6 datacode 8344 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…
... the next at the first ULA video fetch - showing it to ... .
[/quote]
Which issue spectrum are you testing on ... this but looking at an issue 2 schematic, if your spectrum ... there does this mean the ula holds /RAS high instead of ...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…
[QUOTE=Alcoholics Anonymous;225300]Which issue spectrum are you testing on? ... high impedance?[/QUOTE]
Issue 3. See [url]http://www ... was omitted (see the Issue 1 modification history which notes ... at the issue 1 and 2 schematics, if the ULA RAS never ...Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA ... !
Chris[/QUOTE]
Issue two's - I have lots ... are VERY common.
Issue 1 is a rare beast ...Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
[QUOTE=DEATH;225412]Issue two's - I have lots - ... R57 in place between the ULA RAS and the Z80 RFSH ... , and whether the ULA RAS ever goes 'high impedance ...Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... an Issue 2 machine, but it may not have the original ULA ...Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... Winston;225431]I have an Issue 2 machine, but it may ... is to see if the ULA RAS ever goes high ... is getting through and the ULA RAS output must be going ... to read though, as the ULA updating the display is going ... how long after ~INT the ULA RAS go low?
...Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
My issue 2 has the 5C112E ULA and does *not* have R57 ...Who has an Issue 1 or Issue 2 Spectrum??Do you have an Issue 1 or 2 Spectrum (ie machines with 5C102E and 5C112E ULA's) ??? You're help is needed! PLEASE SEE THIS THREAD: [url]http://www.…
... not get refreshed between the ULA finishing with the paper area ... thing is true of the Issue 4S Spectrum.Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…
... to the modulator and the ULA.
Next, with your ... image, you have found the issue.
If you have ...Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…
... to the modulator and the ULA.
Next, with your ... image, you have found the issue.
If you have ...Composite Video output problemHi everyone, I?ve got a problem that?s really bugging me. I have one Spectrum 48K and one Spectrum +3, both with Composite Video output modification…
DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
... ]However, aiming for a "perfect" ULA timing, I intend to use ... an actual speccy ULA, which likes to output switched ... 's possibly the only other issue that can get you - the ... . Note that the Spectrum's ULA actually exceeds the maximum refresh ...DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
... any part refreshed by the ULA? (I probably ought to see ... ago - I checked an Issue 2 and Issue 4 machine with the ... - which is refreshed by the ULA only as a consequence of ...
