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4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... works perfectly with a 5C112E ULA. I have just been testing ... whatever their native (version 6) ULA happened to be.
ULA must sometimes wrongly read from ... only suppose that memory access timings for the 5C112E are slightly ... -
ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …
... the genie from the multiface 128 and pressing esc+Shift F11 ... brings up the multiface 128 menu so can have a ... can select 48, 128, timex or pentagon ula timings and up to 2mb ... -
SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…
... ]
Right now the ULA timings aren't perfect; to fix ... -
Spectrum programmingI have a Spectrum+ at home. I tried to write some programs in BASIC (IIRC i wrote a breakout clone in which you had to hit those spider-like characte…
... just the idiosyncrancies (like the ULA timings etc) that make it a ... -
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..
... , i have another question about Ula timings..
after 14336 T-states ... screen.. this means that the ula is going to read this ... -
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..
... , i have another question about Ula timings..
after 14336 T-states ... screen.. this means that the ula is going to read this ... -states?).
Regarding the timings of the contention, check out ... -
another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)
... this means a bit different ULA timings and not a perfect 4 ... issues raised regarding rejigging the ULA lost me a bit... i ... -
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, …
... , but in the 48K speccy, ULA generated RAS going high switches ... the mux.
The ULA timings for video generation have the ... -
Interlace demoSorry to reference another thread like this, but in the thread: [url]http://www.worldofspectrum.org/forums/showthread.php?p=313428#post313428[/url] …
... of the checkerboard. So the ULA timings that are presumably causing this ... worth asking csmith what the timings really are - he has a ... to use to capture the timings, if he hasn't already ... -
People holding back the emulation sceneAs mentioned once again in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=22690"]this thread[/URL], some people think Ramsoft willfully…
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... muliticolors same like on old ULA (medium priority)
5) when ... . See 2.
4. Standard ULA timing will not change, as ... 2 years discovering why the ULA timings are as they are, so ...Silly question on Russian clonesIv a silly question to ask... Iv been looking at web links about Russian ZX clones with envious eyes, wondering if I might spend money on something…
... as the scorpion has identical ULA timings except for the contended memory ...Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... RAM so fast[/QUOTE]
ULA timings would remain absolutely the same ...SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…
... ]
Right now the ULA timings aren't perfect; to fix ... to the internals of the ULA than the rest of the ...Lot's of Sinclair parts and sparesI have really a lot spares at home, like: - ULA's - All kinds of RAM chips Many of these parts have already been tested. Most of these parts are pu…
... pieces and more.
- ULA (48/128 )
- Z80
€8 ...Most accurate timingWhich emulator is closest in timing to an actual (48k) spectrum? A count to 10,000 loop, printing the loop number each time on screen - same snapsho…
... ! It's PAL this, ULA that, 128 the other these days. No ...Most accurate timingWhich emulator is closest in timing to an actual (48k) spectrum? A count to 10,000 loop, printing the loop number each time on screen - same snapsho…
... ! It's PAL this, ULA that, 128 the other these days. No ...TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…
... not understand the ULA timings, though! It seems the timings are '5602 T ... ) ZX-Spectrum 128K timings' except the border timings are one T-state ...+2A/+3 composite modHi, Anyone has experience doing a composite output mod for +2A/+3? (yes.. I also have a working RGB) A while ago I did one based on the instruction…
... the RGB signal from the ULA (for 128 versions of the Speccy ...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 …
... Spectrum emulator to replace the ULA emulation with "ULA2", but ... unravelling the secrets of the ULA... I started formalising some ... CPU speeds derived from original ULA timings - 3.5MHz, 7MHz, 14MHz ... as the VGA timings are nothing like PAL timings, sadly I ...Harlequin 128k??Hi peeps... I've seen that you can do a 128k version of the Harlequin board. Is it just the standard board with different chips or is it a dif…
... discrete logic implementation of the ULA. The 128 ULA isn't that much ... different internally from the 48 ULA - the ...Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…
I am assuming that 99,9% of the software was written taking into consideration the Pal ULA timings, so according with the technical details given on previous answers, a stock NTSC 48K is actually a rather uninteresting machine for gaming.Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…
Does the Spectrum NEXT output a ntsc video signal whith the proper ntsc ULA timings?GRM 128 for saleI've got ZX-Spectrum 128 clone for sale - "Grand Rom Max 128". It is in white metallic case with external keyboard. The computer contains Beta 128 di…
I've got ZX-Spectrum 128 clone for sale - "Grand Rom ... Max 128". It is in white metallic ... 128 disk interface with one built-in 5,25" disk drive. Timings ... close to Pentagon 128. Works fine. Send ...ScanlinesHere's an excerpt from the FAQ: [quote] Now for the timings of each line itself: define a screen line to start with 256 screen pixels, then border, …
... /> [quote]
Now for the timings of each line itself: define ... the CRT, so if the ULA is reading bytes it does ... is therefore timed as follows: 128 T states of screen, 24 ...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 ... /> Today i bought a multiface 128 from ebay, On this particular ...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 …
... ok.However whenever the spectrum 128+ is connected on that channel ... a faulty Ferranti ULA chipset?
Unfortunately spectrum 128+ does not ... tv.
If ULA is the problem does anyone ... know if there are replacement ULA chips?I know that ...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…
... anyone observed timings of RAS and CAS generated from ULA? I think ... that Ramsoft incorrectly states that ULA doesn't stop CPU when ... br /> [LIST=1]
[*]The ULA address drivers do not open ... constantly reading from it by ULA. The address while bytefetch is ...128 I/O portsIn The Spectrum Hardware Manual there is a small circuit on page 71/72 to allow 128 I/O ports by using IORQ+A7 to override IORQGE, so any I/O access …
... page 71/72 to allow 128 I/O ports by ... with A7=0 prevents the ULA from responding, so freeing ... high to doubly ensure the ULA is not selected. A ... and IORQGE=0. A faulty ULA responds when IORQGE=0, ignoring ... br />
Looking at the 128 I/O ports patch, it ...LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... here[/URL]) describes the detailed timings of contended RAM. It gives ... timings for Z80 instructions that are ... have to wait for the ULA to release the wait state ... [/I] gap in the ULA wait states before it can ... mean in that table of timings?
