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RealXThis may be a dumb question but will RealX ever get released?
... for determining where the ULA reads display/attr bytes ... We only studied the 128K ULA directly, not the 48K ... address lines of the ULA's private bus are ... first contention cycle, the snow mechanism and all our ... is to know about the ULA!
[/QUOTE]
... -
RealXThis may be a dumb question but will RealX ever get released?
... outside of M1 cycles as snow contention. But only when it ... causes the snow.[/QUOTE]
In RS source ... you quoted:
[quote]...the ULA gets confused by the memory ... signal is asserted by the ULA immediately after the rising edge ... -
Portugese SpectrumI've just acquired a Speccy 48K which states "made in Portugal" on the back. I thought Portugese "Spectrums" were actually some illegal copy of a Tim…
... Vertical[/B], [B]15.625kHz Horizontal[/B], [B]3.582056MHz chroma ... Speccy? Can you look at ULA chip, and post here what ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... a major redesign of the ULA and without some extra CPU ... differently. This way, modification to ULA could be kept at minimum ... /> Every feature is useful, even snow effect is used in some ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... differently. This way, modification to ULA could be kept at minimum ... /> Every feature is useful, even snow effect is used in some ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... trivial modifications to the existing ULA.
* Two atari ... .
* Add adjustable ULA interrupt so that it could ... could be synced with the ULA interrupt by some mechanism.< ... would have looked at hardware scrolling for sure, maybe hardware ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... trivial modifications to the existing ULA.
[/quote]
We ... />
[quote]* Add adjustable ULA interrupt so that it could ... could be synced with the ULA interrupt by some mechanism.[/ ... would have looked at hardware scrolling for sure, maybe hardware ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... to do.
Hardware scrolling I may have added as ... meant a redesign of the ULA from scratch so it wouldn ... twice as many cycles during ULA memory access.
[quote ... -
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…
... minimal at cost of complicated ULA logic. And af course, all ... 't matter much since the ULA must read and output a ... that get reused for 8 horizontal scanlines. You can do that ... -
Multiple loading screens[i]Action Biker[/i] suffers from having to endure multiple loading screens. Any other games that have this annoying "feature"?
... Anonymous]No definitely not. The ULA fetches two bytes to display ... attribute per 8 pixels the ULA would have to fetch more ... static multicolor image/sprite moving/scrolling up and down though... -
Xenon TriOxide (Xeo3)I just wanted you all to know that a new cross platform game has started development (well the +4 version has been around a while, but my colleague f…
... b] backbuffer moved by LDI, scrolling by RLD (HL), sprites by ... moved by LDI, RL(HL) scrolling, XOR sprites, 28*14 (?)< ... Star[/b] different routines for scrolling by different speed, back buffer ... games which are looking like horizontal shooter but did not found ... -
Class ofHiya :) Just wondering what`s happening with the Spectrum version of the PC remake of the Speccy original... Class of 99 that is. I know James was w…
... dirty areas updated and the scrolling parts are achieved by copying ... vertical strips instead of useless horizontal ones, using a string table ... -
Speccy graphics on CBM64The recent "Starquake" thread had me browsing through Steve Crow's portfolio of games and I was quite surprised when following the links to the CBM64…
... do hi-res hardware pixel scrolling? [/QUOTE]
... easy to do hardware pixel scrolling in multicolour 160x200 or ... offset to one of 8 horizontal positions or 8 vertical ... are not reliant on hardware scrolling, relying solely on processor ... -
Timex Sinclair 2068Hi guys. This is my first post here, the first of many, I hope.. :) I have a Timex Sinclair 2068 but don?t know much about it. It was given as a gif…
... with two colours per 4 horizontal char cells (IIRC), a 256x192 ... Wolf, etc are smooth pixel scrolling whereas on the MSX1 they ... hw sprites in the same horizontal scan line, what is normally ... -
ZX-Poly platform (a mutiprocessor Spectrum)Hello All May be it would be interestingly for you In the New Year 2007 vacation I wrote the emulator of my platform ZX-Poly (idea since 1994) whic…
ZX-Poly platform (a mutiprocessor Spectrum)Hello All May be it would be interestingly for you In the New Year 2007 vacation I wrote the emulator of my platform ZX-Poly (idea since 1994) whic…
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…
... , everything checked out, rom z80, ula, ram everything. When i powered ... , black paper with thin red horizontal lines moving. 1 or 2 ...Problem with my speccy 48+My machine boots up but apon booting it freezes and you can see feint grey horizontal 1 pixel lines going down the screen. Is this fixable at all?
... you can see feint grey horizontal 1 pixel lines going down ... a thermal fault, could be ULA, Z80, ROM, RAM (etc etc ...RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…
... solder input lines directly to ULA will get much ccleaner picture ... ] vertical, [B]15625 Hz[/B] horizontal. Don't know about your ...RGB OutputWas there ever a device available for the 48 that had a RGB output ? As an alternative , what about using a pc monitor (iirc these have seperate syn…
... ] vertical, [B]15625 Hz[/B] horizontal. Don't know about your ... country.[/QUOTE]
'cos ULA has basically analogue out, we ...Help! Need to prove the Speccy's worthA friend of mine who used to own a C64 (well, alright, not a friend, an aquaintance ;) ) was saying how good Dropzone was, and how it proves that the…
... , can anyone tell me what horizontal games (if any) on the ... can anyone name any Spectrum horizontal shooter games to show him ... processing power, rather than hardware scrolling). Then when he's down ...Reason for FLASH attribute?Is it known why Sinclair choose to implement the flash bit in hardware? Since flashing could be easily done with code when needed it seems quite un…
... such case QL's ULA draws a horizontal line from X1 to ...How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…
... />
Essentially yes. The ULA fetches display data for 8 ... tied to how long the ULA holds the colour value ... TVs themselves vary in their horizontal dot resolution, which is tied ... are horizontally inside the CRT. Horizontal resolution is also affected by ...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…
... . Have you tried a different ULA chip?
... crystal yesterday.
The ULA is a 6C001E-6, ... kind of a thick horizontal stripe (around 10cm thick ... heatsink) and made many ula heatsinks by cutting it ... Already installed one on a ula by doing the "two ...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…
... a magenta border with horizontal lines and then a ... is clearly impossible. The ULA requires at least 2 T ... stopped until after the ULA has fetched that location ... I]after[/I] the ULA has finished reading the ... memory (because before then ULA buses will be busy), ...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…
... squares, a magenta border with horizontal lines and then a black ... people counting it from when ULA pulls INTREQ low, while others ...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…
... why you get the "Snow Effect" with particular values ... IOREQ) is connected to the ULA.
(A0 OR ~IOREQ ... />
So the ULA applies contention when it spots ... The means that no ULA ports are being accessed, ... so the ULA takes no action.
...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…
... why you get the "Snow Effect" with particular values ... thought the snow effect happens because of ULA [B]not ... an explanation why the ULA does not apply ... likely simply because the ULA samples the ~RFSH and ... /> I wonder if the snow effect might be another clue ...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…
... , I thought the snow effect happens because of ULA [B]not[/B ... IR pair clashing with the ULA address put on the bus ...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…
... an explanation why the ULA does not apply contention ... ULA in other cases, however?
I wonder if the snow ... part falls within a ULA period of 6 contended ... as to where a ULA 6 cycle contention ... will work as the ULA contention period always occurs ...
