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Speccy machine code info where is it?Recently I've been trying to learn Z80 and I've managed to make limited progress (some of my routines even compile now!) but I seem to be having trou…
... there are 32 columns. Each byte in the display file represents 8 ... how the screen is filled in increasing byte order, you come up ... a display file address in binary (16 bits):
010B BSSS ... structures and algorithms I've used, which I haven't yet ... -
EmuZWin problem!Hello! I'm trying to load Fairlight I into EmuZWin v2.4.004. It don't load at all. I'v tryed several versions of fairlight I and II. Thees files …
... to load the TZX of Robocop, in 128K mode but ... its presence, but I used strong port reconision for input ... the path of the last save, while for loading ... the folder where you last loaded something. Is it ... saved and restored in the next session. In many cases ... -
Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... manage to work with zero in that byte??? Isn't that weird ... =IM2)
.byte 4 ;BorderColor (0..7, not used by Spectrum 1 ... third and swaps higher 3 bits of l with lower 3 ... /> stack:
.word label2addr(entryPoint) ; in a .sna file entry point ... -
I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... 't get is in what instance is this used?[/quote]
used is because subtraction is the ... certainly can't represent -130 in one byte. All you should concern ... rules that determine how these bits should change when an operation ... -
Announce Pasmo 0.5.1Hello. New release 0.5.1 of Pasmo, multiplatform Z80 cross-assmbler. The main news are related to macros: the MACRO parameters now are expanded ins…
... not interested in squeezing out every last byte and t ... are better off programming it in C.
[/quote]
in C means frequently giving ...
The pacmen demo in particular (click on 'C ... br /> The C compiler used is z88dk and allows free ... -
Spectrum programmingI have a Spectrum+ at home. I tried to write some programs in BASIC (IIRC i wrote a breakout clone in which you had to hit those spider-like characte…
... is obvious (each bit in the byte representing a pixel) ... INK being the low 3 bits, PAPER the next 3 ... [quote]How the bleeper is used?[/quote]
Via ... I cannot recall the precise bits, but I think it ... change these bits at a certain frequency in order to ... -
The game that works only on RealSpec and not on other emulatorsDaley Thompson Decathlon - day 1 (small case) could not load in EmuzWin. Then I tried Clive and Spin and these did not work for this game either. Of …
... A block 22 (in Taper)
The last byte says 68 when ...
The original TZX was done back in 2000, so I probably ... Speedlocked TZXs that need reDumping in-line with Ramsofts' numbering ... the correct decryption tones putting in (Beeps, Bubbles & ... -
Ideas for new tape storage formatSome called them decoders or encoders, but I think that it is just something like form of presentation. Goal is of course smaller size, support of e…
... identical pulse lengths to store bits (but I would say ... time in the future to include atleast the most used ... I had when the TZX format was in its infancy ... ... lot of bloat currently in the TZX format, partly because the ... that has never been used so far we could ... -
Ideas for new tape storage formatSome called them decoders or encoders, but I think that it is just something like form of presentation. Goal is of course smaller size, support of e…
... problem is not in TZX format, but in software for make ... care what format is used so long as it ... /> Simply - People who use tzx know whats wrong. People who ... at least no active in last couple years. If I ... /> If you think that tzx needs expanding to handle certain ... -
ZX-PC InterfaceRight - i'm 34 and I cant take the pain of waiting for tapes to load any more - somethings gotta give ( either the tape deck or me ). I've seen a 'Z…
... this helps, I found it in the +3 manual.
ARTHUR NUMAN (see topic in CHITCHAT).
[quote]
In fact you could sent bits without checkup. I ... a good comminication and the last byte sent by loading/saving is ... -
Unpublished spectrum gameHi there I have a Spectrum PDS development environment and before I get rid of my old PC which has an ISA slot I thought I should ask this question i…
... . Then just edit the registers in the debug window so the ... the space for the loader in multiple parts...
Oh ... ) to convert the wav to .TZX format. Use TZX2TAP to convert ... first 3 bytes and the last byte to get a pure binary ... -
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…
... map. The latter is used to communicate with the ... in the I/O map. The bottom three bits of the byte ... which can be used from elsewhere in a program with ... Each of the variables used in the definition must also be ... brackets must still be used, even if no arguments ... -
TommyGun 0.8.5 available0.8.5 has been uploaded release updates include: * Heaps of bug fixes :) * A getting start guide on how to use TG Please try it and give me your f…
... because in Mode 0: 4 bits per display byte are used to ... describe the colour at that position. So for 1 byte in ... . But in Mode 0, it uses 4 bits per colour ... /> This is why in TommyGun the pixels are ... on Win2K onwards, even works in Vista. :)
I ... -
Speccy MTBFHi, Looking at the old (issue 1-2) PCBs, they do look like someone knocked them up in an etching bath/with a soldering iron in their shed but has th…
... switched from Britain to Samsung in Korea (the Issue 4S ... old 80's 8 bits.
In my experience, it ... they can fail even if used very little
last ditch attempt, when changing ... resin that held the lead in place.
... -
Papaya Labs shop open for DivIDE pre-orders.Papaya Labs are now taking pre-orders for DivIDE interfaces and other DivIDE accessories. Find their shop at [url]http://www.papayalabs.co.uk/shop/[…
... been thinking about TZX... one could replace all IN A,(FEh) instructions ... would then serve bits from the TZX stream. But in order to do ... , we must first identify which IN A,(FEh) actually matter (it ... :) Maybe this idea could be used in some simple form for a ... -
tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
... ,8*31 ; number of LDDs in 8 scanlines
dec h ... /> ld a,(de) ; get first byte in pixel row
ldd
byte into last byte of pixel row
jp ... of a char so these bits are already set
xor ... -
Elite / MagratheaI remember one of the magazines (And my memory was convinced it was Your Sinclair) ran an April Fool's tip advising of a hidden galaxy in Elite. Thi…
... /> Each column was held in a byte of data, so what Sandy ... weird thing - either the bottom bits of Antescher, or the top ... />
Nope. The second four bits weren't really the second ... bit hazy... I last looked at that back in 98.
Games that were better/worse on C64/SpeccyOkay, games that were either: a) Better on the Spectrum or b) better on the C64 Simple heh? I can think of a couple: Bombjack is way better o…
... efforts that CPC users used to hate so much ... not including the 16-bits in this comparison but I ... graphic adventures (ie the last three) so it's ... :[/b]
Last Ninja 2 - no contest really ... " palette actually suits the graphics in this game.
Quick method of fixing TAP parity byte?Quick question: are there any DOS/Win32 utilities (or at least, something in C/++ I could compile in Windows) which fix the broken parity byte of the…
... in red. Be sure to uncheck 'hide flag byte' and 'hide checksum byte ... ' and then just edit the last byte.[/QUOTE ... that could do the thing in one go (rather than loading ... it, saving it as a TZX then running it through TZX2TAP ...Anybody know what program can:Does anybody know of a PC program (or a "set") that can scan through a BASIC program, and replace "D*, D1 or D2" with two spaces. Then, save that sc…
... +MGT format is a byte for byte image of the data on ... bytes of each sector are used for data with most file ... rely on the allocation table bits in the order they're set ...PZX file format draft[QUOTE=Andrew Barker;186084]To this date, there is no rival format for TZX, despite people saying they can do better. Well the challenge is on, prov…
... It's what TZX suffered from in the first place ... Expressing the pulse durations in cycles is what suits purpose ... using the Comment type byte. What do others ... ]I suggest to use byte 0 as delimiter ...[/QUOTE ... it mandatory also for the last line.[/QUOTE]
...Vote for the change of TZX formatThere is an ongoing discussion on the proposal of Patrik Rat to change the current TZX format specification to one that is simpler to implement for e…
... if byte is stored in GDB as 8 bits instead ... being stored as 9 bits in the bit stream of ... validation tool needs them encoded in some particular way?
in this regard ?[/QUOTE]
TZX, and curiously enough it was easier than TAP in ...Vote for the change of TZX formatThere is an ongoing discussion on the proposal of Patrik Rat to change the current TZX format specification to one that is simpler to implement for e…
... matter if byte is stored in GDB as 8 bits instead of ... being stored as 9 bits in the bit stream of ... may be best housed in a external utility. Perhaps ... we are closing in on what is different about ... preservation team want from TZX and what the emulator ...Question about digitized sound and videoI searched the forums and couldn't find the answer, so here it goes. Regarding digitized sound: I remember reading an article long ago about a vid…
... the AY it's 4 bits per sample, so from that ... fit 8 1-bit samples in a byte)
- alternatively, 5 ... 2 1-bit samples in a byte).
In other words, at ... the routine and POKE them in, but it's quite ... installed perl, but I never used it before. Do I need ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... 1 pixel at a time in the buffer
////////////////////////////////////////////////////////////////////
.start ... variables. It will push 16 bits for "uchar *sbuf", then 16 ... pointer SP pointing at the last byte pushed on the stack (where ...Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... pixel row for the speccy in assembly. One is to ... co-ords into the appropriate bits in H & L registers. ... , aligned to a 256 byte boundary, and followed by ... , aligned to a 256 byte boundary, and this table ... either be ignored or used for other 1 byte variables.Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... high correlation between certain bits in successively generated random numbers. ... generated is highly correlated with bits in previous numbers generated.
... that the large 240+ byte buffer is no longer ... take the program listed in my last post that lists % ...
