-
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... fits entirely into side border time (100 T states). You have a LD ... fb value returned over the border to #71 when the ... delays execution until the lower border. This is then repeated until ... ' and the border time is reduced to 100 T states per line again, in ... -
Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…
There's actually 224T per line (228T on a 128 ... takes to draw the border on the right, flip ... next line of border on the left. So for 96 T-states per line ... thus re-synchronising each line. This is what Nirvana ... on during the top line of the screen; synchronising ... -
Timing of Timex Computer 2068Is the timing of the Timex Computer 2068 fully documented yet? I have one here with the ZX Spectrum Emulator cartridge and have downloaded a few test…
... 48K. There are 224 t-states per line and 312 lines per frame. The screen ... the data buses. I haven't checked if this is the ... -
The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…
... tested under Fuse. Doesn't affect gameplay though.[/QUOTE]< ... I think) 215 T-states to copy each line, allowing for some ... Pentagon version takes exactly 224 T-states per line, without contention.
line-by-line function for the + ... -
The So What's This Buzzsaw All About Then? Thread.Erm. This: [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap"]http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_1.tap[/URL] Keys…
... of the code with 219 T-States per line, somewhere betweeen the 48k/128K ... -
Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
...
Even 128K models aren't 100% compatible with 16/48K ... , floating bus, fixed number of T-states per line/frame, etc.)
... a Spectrum clone and don't take into account those ... singularities, many games won't work or will "stutter". ... -
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... [/CODE]
taking 27/26 states. And the advantage goes clearly ... [/CODE]
taking just 21 states. And wasting a whole register ... down only cost you 11 states.[/QUOTE]
But, as ... (on average) only about 8 T-states per line with NO extra registers used ... -
5C series NTSC ULA 5C114E 8248Not sure if this has been mentioned before; I haven't seen anything about it online. Chris Smith's book discusses 6C011E as the NTSC ULA sold in Spec…
... this ULA uses 224 t-states per line and 264 lines per frame video timing ... MHz
15.625 kHz line frequency
59.1856 Hz ... MHz
15747.767857 kHz line frequency
59.6506 Hz ... MHz
15.750 kHz line frequency
59.65909 Hz ... -
1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …
... too by removing 7 t-states per line search cycle. Doesn’t seem much, but ... -
1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …
... . The new version is 13 t-states faster in the same size ... />
Oh and another 11 t-states per line saved now too, probably not ... -
Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
... to advance to the next line by incrementing only the ... as handling string terminators and line feed (carriage return) characters. ... automatically creates a new line and prints it at the ... up insignificantly (saved about 21 T states per line). I also tweaked the ... -
Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …
... scrolling loader counter in 85 T-States?
I have a ...
inc h ; next pixel line down
ld a,h ... scrolling load counter in 85 t-states. Should be possible to update ... stack useage. My loader doesn't touch the stack, no calls ... -
Fixing a ZX Clone from .ru - 27 years late.Hi there, I've currently assembled another russian clone a "Compact 256 Turbo" from a PCB I bought. The machine appears to be fully functional and o…
... to be largely compatible (69888 T-States per INT, 295/312 Lines on ... see the Border gets drawn a bit too early (uppermost line is ... a 8 Pixel offset between Border and Screen. Demo used is ... -
Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... routine runs a tight 8 t-states circle inc a:jp ( ... t-states per frame, so that the starting t-state slips by 1 t-state per ... usually happens only once a line at most, attributes being ... with vertical lines on the border aligning with the main ... , I was out of line. -
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, …
... screen line is therefore timed as follows: 128 T states of screen, 24 T states ... of right border, 48 T states of horizontal retrace and 24 T states of left border ... thick, but... which line do those last 24T states belong to ? The ... -
How many T-states takes PUSH DE ?Hi. Just a quick one. According to z80.info docs, a PUSH DE should take 11 T-States to be executed. But WHAT if SP is pointing to Contended Memory,…
... PUSH DE should take 11 T-States to be executed.
T states looks OK, but shouldn't it take longer ... interrupts disabled but that shouldn't change the fact that the ... />
I think this 11 T states info is normal situation and ... -
Difference in emulator screen sizes and coloursSeeing as Greencard's gone out drinking... I've done a comparison between Spectaculator and ZXSpin. ZXSpin's full screen with border is taller than S…
... an interrupt occurs, 64 line times (14336 T states; see below for exact ... screen line is therefore timed as follows: 128 T states of screen, 24 T states ... of right border, 48 T states of horizontal retrace and 24 T states of left border ... -
River Raid Tech DemoJust a little something to look at. Enjoy. [URL="http://www.joefish.co.uk/speccy/Joefish_River_Raid_Tech_Demo_01.tap"]Joefish_River_Raid_Tech_Demo_…
... PUSHes for each line in the 96 T-states of side border; then my ... don't have time to do extras like the border colour ... Pentagon compatibility, but without the border effects.
As ... 'other clones', if they don't synchronise, tough. You really can ... -
Sprite MaskingI was looking at the sprites in some games, and noticed they have sprite followed by mask. Usually a row at a time (so the mask is sort of interleave…
... they have, and we don't.) :cry:
The basic ... , you'll consume 18 more T-states per iteration.
Now suppose ... jump to the next scan line in a character cell by ... de ; line 6
inc d ; line 7[/code]
Line 6 ... -
What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... MHz and there are 228 t-states per scanline.
[QUOTE=csmith ... that OUT's a black border, then white, and see if ... is "btime" test? I couldn't find it in the fusetest ... -
BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…
... T-states make up the top bit of the overscan and border area ... the 128, there are 228 T-states per scanline rather than the 224 ... -
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... /> [LIST]
[*] There are 228 T-states per scanline.
[*] The ... at least 16 T for the left border, 128 T for main screen ... T-states after the interrupt occurs.[/strike] More specifically, to modify the border ... -
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... /> [LIST]
[*] There are 228 T-states per scanline.
[*] ... at least 20 T for the left border, 128 T for main ... screen, at least 24 T for the right border ... scan lines for visible lower border, and the rest for ... -
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…
... T-states long, meaning there must be 262 scanlines including retrace and border ... to know how many T-states for the border.
Apparently the ... spurious contention is applied as per the Sinclair machines when neither ... -
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... at least 20 T for the left border, 128 T for main ... /> [LIST]
[*] There are 228 T-states per scanline.
[*] The scanline ... timing is 24 T for the left border, 128 T for main ... screen, 24 T for the right border, and ... -
20-column multicolour: a half-baked ideaI was writing an email reply to one Mr Jowett about multicolour routines, and in that way that explaining something to someone else makes you think "…
... ]You've got more free t-states per frame on the +2A/+3 ... ]
The number of T-states per frame is not important. The ... the limited number of T-states per raster scan line (224T for a Spectrum ...
