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ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... results, so this version above already contains everything you ... attributes directly to their proper screen addresses. In this case ... separately to their proper screen addresses. This option may ... all bytes from first screen column (in pixel order), then all ... -
Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…
...
Afterall, if the screen is generated in software by ... timing, any actual pixel on the CRT screen should be individually ... controllable, right? The ZX-81 font set ... the ZX-81 the same pixel resolution as the Spectrum ( ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... /einar/o-mundo-perdido/"]this screen[/URL] to see what I ... /> [CODE]; from RCS buffer to screen (DE must contain RCS address ... ),a
inc h ; next pixel line
ld a,h ... /> [/CODE]
The routine above is simpler and shorter, it ... -
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... transform a regular ZX-Spectrum screen file (such as "Cobra. ... format back into a regular screen. However this method requires a ... directly to the ZX-Spectrum screen.[/LIST]
The RCS ... format back into a regular screen. The standalone routine allows using ... -
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... of a pixel from three neighbours (e.g. left, above, and above-left ... 75% accuracy should reduce each screen in 20%, a 80% accuracy ... -
RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…
... "No files found". I set the file attribute to read ... mentioned above, the latter I just bunged on the screen as ... setup cache
jp $0500 ; set default drive and exit
[*]clear the screen
[*]swap the $5b00 area ... -
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... areas starting at any pixel position on the screen - which is complicated ... re-ordering to get the screen data in sequential order. Then ... to reduce the number of set pixels. Then use (a) arithmetic ... to encode short patterns of set/unset pixels, until a big ... -
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
... re-ordering to get the screen data in sequential order. Then ... to reduce the number of set pixels. Then use (a) ... to encode short patterns of set/unset pixels, until a big ... ) to reference previous sequences with pixel precision. Thus repetition would be ... -
Converting games to disk: difficult loadersThis thread has an spanish version in foro speccy, but I haven't gathered enough information to overcome my problems. I've been converting some game…
... for Magnetron that I showed above, so the debugger breaks when ... first breaks to draw the screen, just below you'll see ... call pages in bank 1 (set by A), and copies 16384 ... -
Windows 8 selling well...[Img]http://cultofmac.cultofmaccom.netdna-cdn.com/wp-content/uploads/2013/01/downgradetowindows7.jpg[/Img] When suppliers start selling downgrades y…
... bit of a bitch to set up:
Initially it ... monitors, with a confusing message above 'nothing can be sent from ... mouse top right on a screen.
So first opinions ... -
BIFROST* for graphic artists - part 1Using multicolor requires 2 very different skills: [I]programming[/I] and [I]graphic design[/I]. I already wrote several tutorials about the former …
... on each row of the screen.[/QUOTE]
... in the right half of screen".
Otherwise, ... screen would require finding an empty "slot" (pair of instructions as above ... ) in each pixel line and setting appropriate ... -
I'm very illA few weeks back I passed out/blacked out in the bathroom and woke up on the floor with a terrible pain in my chest. In the fall I somehow broke my …
... detailed treatment regime as outlined above I do see a better ... leads into a whole new set of procedures for dealing with ... estimate and display on a screen you can see) you will ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... : port #FF is used to set new modes. Bit 1 is ... the address of a 8-pixel scan in bitmap data, N ... /> The SAM has a similar screen mode, but I don't ... -
ZX Alien BreedNot sure if this has been mentioned already (I did trawl the threads but couldn't see anything :smile: ), but I've always hankered after a Speccy Ali…
... features and some of the set pieces are remarkable in terms ... ... Id also make it flip screen (design my rooms with that ... room to move, then the above compromises (ie: no scrolling, no ... -
A quick newbish questionI'm reading through 'mastering machine code on your spectrum',as kindly posted by Mr bert on this forum. Correct me if I'm wrong from what i read,bu…
... 22527 is the screen.
The screen is made up ... you see how each pixel can be switched on ... so you've got 6144 screen locations.
... the colours are put on screen
Attribute area ... value in the range above and you can change ... -
Timex undocumented video modesHi people. Please check my assumption about the functioning of the Timex in undocumented video modes: D2D1D0 wr #FF 0 0 0 - ZX color mode, the base …
... the base address of the screen #4000
0 0 ... the screen #6000
0 1 0 - Multicolor mode, pixel adress ... the base address of the screen #4000
1 0 ... ), repeated 8 times down the screen.
1 0 ... All modes with bit 2 set are 512*192 modes. Bit ... -
Bad Loading screens.All this Avalon and Dragontorc talk got me thinking about 'Sorcery' that was on the Softaid compilation. Then I had a glance at 'The Pyramid' [img]h…
... it.
Thus, a screen can be "optimised" for loading ... more pixels set than unset, and then inverting the pixel values of ... -
Bad Loading screens.All this Avalon and Dragontorc talk got me thinking about 'Sorcery' that was on the Softaid compilation. Then I had a glance at 'The Pyramid' [img]h…
... it.
Thus, a screen can be "optimised" for loading ... more pixels set than unset, and then inverting the pixel values of ... -
ZX-Assembler in progress...Dear readers, I just want to announce that ZX-Assembler is not longer only an idea in my mind. It's just alive. Unfortunately, it's too early to mak…
... to store the info above, in case you need ... routine to print tile to screen", and addresses 64000 to ... routine to print tile to screen"
64000: mode-graphics ... is that the idea above would make it possible ... "graphics" you mean simply pixel data (1s and 0s ... -
5th QuadrantAnyone ever mapped or completed it? Theres a game in there somewhere im sure of it but I cant make head nor tail of it!
... number (the blue number mentioned above). Fortunately I compiled a number ... /> I'll re-run the screen dump and print the blue ... changing each time. I can set up a Paintshop batch job ... the status panel from each screen. Hmmm ... I wonder if I ... -
FZX: a new standard format and driver for proportional fonts[B]FZX[/B] is a very compact and efficient (although extremely flexible and powerful) standard format to create new fonts for the ZX-Spectrum. It sup…
... or can it utilise specific screen coordinates?[/QUOTE]
... you can print anywhere on screen. For instance:
[ ... example above, [B]y[/B] is the vertical coordinate (pixel line ... ] is the horizontal coordinate (pixel column from 0 to 255). -
Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…
... the mouse position by one pixel every 1/50s. So ... pixel each interrupt so that you could move across the screen ... in a reasonable time. But then you lose pixel ... is you can't set the position of the ... thing is you have to set up interrupt routines, which ... -
Strider II (and others) + 3 disk versionsHello everyone, I've been working on converting some games to be able to load them from the +3 floppy. I started with single load games but now Im i…
... ),A
LDIR ;erase screen
PI_1: ld a,( ... cache
jp $0500 ; set default drive and exit
above at DOSInit where I ... ;BANKM (23388)
set 4,a
ld h ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... and sometimes slightly above any text on the screen.[/QUOTE]
set of 4116s, I'll send ... -
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 "…
... the remaining time to update pixel lines.
Therefore ... the pixel line.
[*]In 2nd raster scan, set [B ... />
[*]In 3rd raster scan, set [B]SP[/B] near the ... />
Of course the description above is just a rough estimate ... -
generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…
... old "random plot screen erase" and "random attribute screen reveal" routines. So ... entering those coordinates where the pixel is set, setting all the others ... -
generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…
... entering those coordinates where the pixel is set, setting all the others ... was another image already on screen. -
generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…
... bit position & check 2nd screen byte
and (hl) ; ... DoPlot
;if bit is set, reset it
UnPlot: ... br /> ;if bit is reset, set it
DoPlot: or ( ... I remembered what I mentioned above, that once I start ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... 2 if the bits are set and 0 if they're ... really short pilot. As observed above, there's no delay during ...
;; load attributes into screen RAM, forwards, without
;; an ... possible to, say, load the screen attributes into high memory somewhere ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... screen. The turbo block is a generalized data block as described above ... the bottom third of the screen is loading.
[CODE] ;; set this test program to load a screen
ld ... increased a little as explained above.
3/ ...
