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Run Length DecodingRun length encoding/decoding is far less efficient than using a modern compression program.
... ratio depends on algorythm AND data.
i can imagine that ... will be good at output from BMP2SCR, RLE will be very ... logical flow of data but memory compressor will suffer from "ilogical" screen structure ... -
+3 disc imaging (idea + SDP)Following a bit of research, which you can probably see in the "old code" thread, I had an idea for a bit of software that may be useful (for me, and…
... software and the raw bitstream from the drive - that's why ... format used on the ST from being written. The only saving ... system tries to read from it, garbage is returned. Read again, it still ... and varying patterns in the read data, and it has to match ... -
New - BASin r13a is available for downloadHi all, Here's the latest BASin. Mostly just bugfixes, but also now has the upgraded UDG editor which can now edit multiple UDGs on one editing gri…
... when you specify the data format to rip from memory.
... sprites rather than rip them from memory though.
[quote ... you to choose where in memory to place sprites, couldn' ... the sprites to make more memory available?
[/quote]
... -
ZXCF InterfaceI'm just trying to get an idea for the ZXCF interface, and to me, it looks a much cleaner design compared to divIDE (Of course, that's just my opinio…
... />
[code]
Memory is based around a possible ... where ULA fetches
video data from.
Port #13BF BLK3 ... provide a Spectrum 128k compatible memory map, while
... systems are needed to control memory. Likewise, I really don ... -
New - BASin r13a is available for downloadHi all, Here's the latest BASin. Mostly just bugfixes, but also now has the upgraded UDG editor which can now edit multiple UDGs on one editing gri…
... handled by the Data Format when you rip from memory (or create a ... every other sprite is mask data?
D ... -
IDE InterfaceHi all, I've found a diagram for an 8-bit IDE interface...[url]http://www.zxplus3e.plus.com/interface.html[/url] It looks nice and simple and, if I…
... I got an e-mail from someone who made this interface ... same, read/write from some port. Even if that port is memory mapped ... -
How to speed up TZX loading (emu development)With many newer emulators there are options to do faster loading schemes, even for turbo-loader or protected loader blocks in TZX files. For example,…
... at the next edge coming from the TZX - and then set ... it, and loading the data into memory yourself and then telling the ... -
Linux WAV to TZX convertorsI looked through the posts and seen a few threads about converting WAVs to tzx but none of them are working for me. I have a few old tapes that don't…
... go at getting makeTZX to read directly from the tape to see ... before the 19 bytes of data.
Is there any significance ... actual data starts?
Do I need to read the entire block from ... -
Help me remember the name of this game.I'm trying to remember the name of old side scrolling platformer I played on zx80 Spectrum computer. I remember it had an item you could pick up that…
... ; it happens every time I read one of your posts.[/QUOTE ... once again?[/QUOTE]
From Rafal's email which he ... settings in tools/options from memory:Zx Spectrum to memory:Pentagon, otherwise you ... -
linking speccy (+3) to PCI want to load games in to the speccy, I can do the soundcard playing into the speccy thing, but, is there a more advanced way? i've had a look for …
... write a program to move data from a disk image on ... course these will take up memory,
I'm no ... a program to take the data from rs323, and write to ... loaded the games straight to memory you wouldnt be able ... to use the full memory (as the transfer prog ... -
Lesser used BASIC commandsAre there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc? The Spectrum BAS…
... loader which loads new level data from the RAM disk.[/QUOTE]
from which you can see the ... 6 bytes or so of memory reserved for variables and a ... manuals document the uspeech's memory mapped variable space. Here's ... -
Trying to experience nostalgia!! Mp3s needed!!!I've been trying to get audio files (mp3 or wav) to work on my real old sinclair 48k. I've tried making them from my old tapes of which I have many, …
... from tap, run this program on your spectrum. The program will read ... the data from EAR and simultaneously write it ... -
RealXThis may be a dumb question but will RealX ever get released?
... reads display/attr bytes from the display memory is certainly wrong - what ... to see that the new data from your friend matches the values ... Woody obtained from our real 48k - it's ... -
RealXThis may be a dumb question but will RealX ever get released?
... reads display/attr bytes from the display memory is certainly wrong - what ... to see that the new data from your friend matches the values ... as soon as enough data are available. From the preliminary tests, it ... when the Z80 starts a memory cycle at T=14337.
Playing Denied Ultimate GamesHmmm, maybe this belongs in Emulators but it is game specific. Just been leafing through Games(TM) in Smiths and there's an article about a (strong)…
... worth mentioning), but from what I've read and from people who have ... : drive for it's virtual memory file give a Windows "Out ... of Memory" error?, and yes I mean ... error, not a DOS expanded memory error), or sometimes leaves a ...The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... 48K Spectrum. The extra memory was nice (though if ... commercial magazines' moving away from programming articles and tutorials, ... that offered more freedom from colour clash, at the ... continue reading video data from anywhere else in memory, when it reached ...Decent Assembler...I'm quite in the mood to learn a bit of Z80... Can anyone recommend an easy to use assembler (that will run on a real Speccy) that's not too complic…
... generally more difficult to import data from tools like Seven Up and ... you want to access the memory that's used by the ... gives you a totally free memory map to play with.
Question for the tzx dev guru'sI'm almost finished with a batch of adventure tapes which I've got on loan.. The final tape, is a development version of Birthday Surprise, which ha…
... already to recover bits of data from damaged tapes?
DamTape ...
DamTape can read any fragment of data block also completely without ... to get back binary code from DAMaged zx spectrum physical TAPE ...Graphics Mask FormatsHi. Just a quick question. I'm curently hacking a little program to aid my in my own ZX development (i'm hoping to build a little collection of tools…
... of seperate sprite/masks in memory -- too much need for additional ... data to write, too. I usually use that technique for clearing data from ...Graphics Mask FormatsHi. Just a quick question. I'm curently hacking a little program to aid my in my own ZX development (i'm hoping to build a little collection of tools…
... use that technique for clearing data from the screen.[/QUOTE]
Yes ... to dump on-screen data - or grab data - can gain you ... eye on interrupts. Clearing screen data - including sprites - is always ... -loop of LDI's if memory serves - and found the game ...Small C on Sam help neededI'm trying to make good on some of my old developments that fell by the wayside and one of them uses Small C. The reason I stopped was down to not h…
... certainly understand it when I read it from the compiled output, can ... ( not least because of the memory bandwidth! ) but in theory, it ... over 3 grand or so from my own pocket and countless ...I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... _writing into ULA_. (because data from Z80 is valid during ... from ULA this can't be right as Z80 probes data ... end of T3. The data is put out early ... read, i/o peripherals put data on the data bus anywhere from ... This ensures that the data driven on the bus ...I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... is acting a read/write operation on video memory one cycle before ... the address to the video memory (ras & cas signals). ... cycle long, not four (like memory operation).
[QUOTE= ... cycle. ULA is about to read from memory. It doesn't stop the ...Death of the Computer Science DepartmentRead this article on the death of the computer science department in universities by Neil McBride from De Montfort. It makes very interesting (and wo…
... of physical space occupied by data is proportional to the amount ... of data being stored. In order to ... any random point within that data we have to move the ... , thus the time to read arbitrary data from disk is proportional to N ...Death of the Computer Science DepartmentRead this article on the death of the computer science department in universities by Neil McBride from De Montfort. It makes very interesting (and wo…
... , thus the time to read arbitrary data from disk is proportional to N ...Death of the Computer Science DepartmentRead this article on the death of the computer science department in universities by Neil McBride from De Montfort. It makes very interesting (and wo…
... , thus the time to read arbitrary data from disk is proportional to N ...Death of the Computer Science DepartmentRead this article on the death of the computer science department in universities by Neil McBride from De Montfort. It makes very interesting (and wo…
... of physical space occupied by data is proportional to the amount ... of data being stored. In order to ... any random point within that data we have to move the ... , thus the time to read arbitrary data from disk is proportional to N ...toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... additionally - although my analogue electronics fu is not all that strong, looking at the schematics for an Issue 2 suggests that the power supply that generates some of the 'weird' voltages (+12v) is a switch mode power supply, which gets regulated by ...Bubble Bobble EditI thought I might have a go at editing Bubble Bobble myself after reading this... [url]http://www.worldofspectrum.org/forums/showthread.php?t=15452[…
... checked look correct when drawn from memory, but when you place blocks ... position
S = save data
L = load data
Game Programming Source Code & Startup HelpHi there, I'm planning on porting an existing commercial title to the speccy. I'm in the process of disassembling the original code and commenting i…
... be scrolled and continually updated from memory.
[/quote]
... graphics engine should be written from scratch for scrolling and ... in the 16-bit port READ of the keyboard and ... as the other spectrum joystick read functions in that directory. ...
