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TZX and the ZX81Evenin All. EightyOne is now is a state where I can support a more descriptive tape format. I know how some people have been calling for tzx suppor…
...
06 2 Length of Gap between bits
07 1 ID ... /> Possibly with another byte in there for the used bits in the last byte (I don't ... any sort of header whereas the ZX81 puts the filename before the actual data ... -
Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... to "used bits" is probably easier to handle, even though the other interpretation ... means "number of symbols" and not "bytes". The actual number of bytes would ... be NN = ceiling of (Length*num_bits_per_symbol/8), and the used bits in the last byte ... -
Draft specs for TZX v1.20Hi all! In the attempt to restart the development of the TZX format, I've put online the first version of the draft document [1]. At the moment ther…
... to "used bits" is probably easier to handle, even though the other interpretation ... of bytes would be NN = ceiling of (Length*num_bits_per_symbol/8), and the used bits in the last byte ... with "used bits". It's what's done everywhere else in the format. -
TZX format and Enterprise files(**) The Enterprise stores data in a different way than all other computers do. It stores the LSb first, but the data blocks require the data to be M…
It looks like the VIC20 and C64 standard files ... end mark on each byte. Why does the standard have all that ... even/odd parity mark? The end of byte mark standard values can't ... .
The used bits in the last byte would be 00xxxxxx if the data is LSb ... -
Test your emulator with one damn tricky TZX file!Some time ago I got hold of this tricky TZX file with a custom [i]super[/i] turbo-loader. [i]The load time is 18 seconds (!)[/i]. Until recently, I w…
... it[/i], the byte at offset 0x04 denotes the number of used bits in the last byte of the block, and ... , you simply specify how many bits of the last byte are used, (i.e. represent actual ... -
AY musicThis is a format I'm proposing for an AY music player. If anyone can see any problems or anywhere it can be improved please say so. An AY music form…
... The first 4 bits of the first byte contain the type of message and the other bits and the 2nd byte ... Start 2byte - refrence used for keeping track of the beginning of the stream for use ... for the end of the last instrument data. (Using pairs
cyborg
October 2001
Sinclair Miscellaneous
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The last 8 bit standingCan someone tell me which of the 8 bits was the last to fall? (ie. the last to have commercially released games). Someone at work told me that the …
... tell me which of the 8 bits was the last to fall? (ie. the last to have ... at work told me that the C64 was still getting commercialy ... 1994. I thought it was the Spectrum (which lasted till 1993 ... -
Z80 internal compressionThis isn't exactly a ZX Spectrum problem, but since WOS probably has some of the best Z80 coders in the world, I thought I might ask anyway. For my …
... UM3 ; was this the last bit in the current byte?
LD C ... LD L,(HL) ; the second byte is used for the offset
LD C ... ,A ; three bits of the first byte are used to encode the offset
... the offset byte was 0 then we know this is the end of the ... -
How to print logo onto screen at chosen coordinates?Hi, I've just got back into zx spectrum games after all these years and after seeing some of the great games on here I would like to start learning p…
... :
An integer value is used for the screen address. (or any ... often used to store memory addresses
H is the high byte of the ...
the last 3 bits of the high byte represent which pixel line of the attribute to ... -
Test your emulator with one damn tricky TZX file!Some time ago I got hold of this tricky TZX file with a custom [i]super[/i] turbo-loader. [i]The load time is 18 seconds (!)[/i]. Until recently, I w…
... (Direct Recording), the byte at offset 0x04 (used bits/samples in last byte of data) should take ... a value of 1–8 ... (according to the ... -
Test your emulator with one damn tricky TZX file!Some time ago I got hold of this tricky TZX file with a custom [i]super[/i] turbo-loader. [i]The load time is 18 seconds (!)[/i]. Until recently, I w…
... the horse’s mouth[/url]:
[quote]Used bits (samples) in last byte of ... of the last byte will be played)[/quote]
It only specifies the length of the ... very last byte of data, potentially enabling ... -
Favourite Gaming moment of the last 25 yearsin a continuation of the 25 years thread what's you favourite moment it could be anything a sprite, a soundbite a loading screen anything mime is w…
in a continuation of the 25 years thread
... with one swipe of your staff in Robin of the Wood a satisfying ... -
The Last Word, 1987 cassette editionI have not found the 1987 cassette edition of "The Last Word" on any of the well-known sites - only the +3 disk edition, and the earlier versions. I…
I have not found the 1987 cassette edition of "The Last Word" on any of the well-known sites - only the +3 disk edition, and the earlier versions.
Is the cassette edition MIA? If so, I will keep my eyes open for it. -
Best Homebrew Spectrum game from the last 10 yearsOK! So I visited again the Best Spectrum game of the last years polls and selected the best 5 games in each year, to decide which one, for you, is th…
OK! So I visited again the Best Spectrum game of the last years polls and selected the best 5 games in each year, to decide which one, for you, is the best Spectrum game developed in the last 10 years.
This time, each voter can pick 5 games ;) -
The Last Word - newer than 2.1I am seeking a copy of "The Last Word" in a version newer than 2.1. I remember years ago I had this, and it's very similar to the +3 version, but thi…
I am seeking a copy of "The Last Word" in a version newer ... it's very similar to the +3 version, but this one ... this as part of an experiment into emulating the Spectrum setup I ... -
NEW RELEASE: "Willy's New Mansion" Special EditionOn the twelfth anniversary of the [url="https://groups.yahoo.com/neo/groups/manicminerandjetsetwilly/conversations/messages/4593"]release[/url] of my…
... the PAPER colour of the top two thirds of the screen (the playing area), the lower third (the ... ;
- available space used virtually to the last byte;
- a 130 ... -
Random-Access to Microdrive FileI am working on a BASIC program to backup a microdrive text-file to standard tape array-file. To backup a text-file from one microdrive to a secon…
... the maximum of 254 sectors. Okay, this text file "!Blocks" is used ... -area and forcing the re-PRINT# of the last byte of the sector.
... the address of microdrive map
[b]BUF[/b] is the address of the 512 byte ... " error, so the last SAVE should be ... -
Speedlock & Spin (again)Following on from the Vixen thread, I've come across another game which crashes during the decryption beeps - Imagine's "Ping Pong". With Vixen, a ne…
... in 5 bits from the last byte in the Pure Data blocks, whereas the TZX Vault ... surmise that the speedlock in question uses the last byte or so of the tape data ... to verify that the load ... -
Need help with tzxing once again :)You people helped me so much in this thread witch a custom loader: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36109[/url] Maybe we…
... start to agree with one of the extra pulses in Mikie' ... That doesn't change the number of bits in the last byte, I still don't ...
see 8 bytes everytime (altough the ... inside the data blocks should match the ones in the pilot ... -
Need help with tzxing once again :)You people helped me so much in this thread witch a custom loader: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36109[/url] Maybe we…
... here is a improved version of the extractor source, with command-line ... , check the txt file for the number of pilot "pairs", the number of bits in the last byte (sometimes ... because the length of the pulse is somewhat longer) and the pause until the next ... -
Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…
... the attribute byte to be changed before the display bytes and for the bits of the display byte ... 'm pretty sure that changing the order of the attribute and display bytes ... that you used black ink on black paper as part of the routine ... -
Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…
... the attribute byte to be changed before the display bytes and for the bits of the display byte ... 'm pretty sure that changing the order of the attribute and display bytes ... that you used black ink on black paper as part of the routine ... -
Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... here. It is the fact that /RD is used. /RD should not ... A5 to one of the input pins, then use the corresponding output as ... 74LS138 uses 3 input bits to select 1 of 8 output pins ... simply look to the bits of the high byte to select one of eight joysticks:
Kliatba Noci IssuesI am having issues loading - not playing, LOADING - Kliatba Noci on my 128K Spectrum (Toastrack). The game seems to load the first two blocks, then I…
... "transfer" you mean load the games into the machine, then I'm ... 520 smartphone with FLAC Player (the games are in FLAC audio ... tries to load some extra bits after the last byte of a fake header. If ... they're not there, the game ...Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…
... + the fire button mapped to the lower 5 bits with the upper 3 bits of the byte hardwired ... the number of that joystick to the top 3 bits of the data byte.
From the ... was used instead the game would detect only the one joystick as bits 5 ...Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... would have chosen the top byte of the ports in the 0x40xx-0x7Fxx ... ULA would have the same contention, regardless of the port decoding ... because it is the ULA, regardless of which ports were used.
... he was just decoding the top two bits of the high byte.displaying all memory activity in a screenDunno why I keep thinking about this, but here goes Is it easy enough to add a screen to an emulator that shows every memory address' activity.... …
... individual bits, the logic changes from just a straight write of 0xff into the ... an XOR of the last byte written to this location with the byte being written
[*]Working out which bits have changed ...displaying all memory activity in a screenDunno why I keep thinking about this, but here goes Is it easy enough to add a screen to an emulator that shows every memory address' activity.... …
... an XOR of the last byte written to this location with the byte being written
[*]Working out which bits have changed ... , use the 0/1 bits from the memory for the green index, per-byte write ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... used a 24x2 byte lookup table to work out the screen address instead of ... byte at the end of the string or set the high bit of the last byte of the string.. DC in the ... also set the attributes (colours, brightness, flashing) of a string. I used a ...
