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Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... required
2: Invert the byte when needed
... call revByte with your victim byte in a & the ... 256 byte table of reversed values
; hl = base of 256 byte table ... the last byte is written
ret
; Of course ... -
whoo hooI bought an Atari 520STFM on ebay from a guy i know for ?26 this week is going to be awesome. Its just a pitty that this week my electric is being cu…
... can have up to 4MB of RAM, but if you have ... thinking it only had 2MB of RAM.
One ... discs (misleading, as some of the discs actually were ... able to find torrents of the game collections (each ... were years back, when I last visited, anyway), and they ... -
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 ... 't change the number of bits in the last byte, I still don ... -
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…
... and this is mistake of course have 8 different ... is a improved version of the extractor source, with ... the "special" blocks: length of 0 pulse (not bit), ... pairs", the number of bits in the last byte (sometimes there's ... it because the length of the pulse is somewhat ... -
tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…
... to dynamically adjust the spare RAM available for variables during runtime ... "tiny" version (53 bytes instead of 12).
This ... ve just pinched a bit of code from the 48k ... ; 35 ;loop to find end of
L_7539: INC HL ; ... -
Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... Spectrum are...little 8 byte blocks of characters just like ... - where A is the RAM and B is the screen ... )
;I take one byte of sprite data.....
ld ( ... move along to the next byte of sprite data
... loop back to move another byte of data - and keep ... -
Dingo[QUOTE=R-Tape;576504]I know it's still Reply time for you guys, but don't forget to start a new thread in Brand New Software so I can say how good th…
... couple of days ago to tell me that Dingo is now available ... application[/URL] - running under Spectaculator of course.
This version ... have done away with the last bits of real wasteful code in ... I now have a bit of room to work with so ... -
AGD 2.6 WoesThis was originally in the New Game Ideas section but thought this would be the best place to post this: I'm no programmer, hence i'm using the exce…
... , say, 'left' instead of 'key 0', 'right' instead of 'key 1' and ... but a free halfblood offspring of your commercial projects, but it ... be awesome--hopefully every byte will be available ;)
The only ... -
Anyone heard about the Chameleon before?Commodore haters: please skip this topic, allthough it's definately Speccy related! ;) [url]http://www.syntiac.com/chameleon.html[/url] Someone mad…
... a chat with the developer of this product, whom is a ... 512K Spectrum Core with TRDOS available, the Chameleon is pretty damn ... />
It comes with 32MB of RAM that is distributable for the ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... be happening on the lower RAM address lines when the ... set-up of the address for the first display byte if ... it happens just as the end of the ... display, but not the contents of RAM. Perhaps it's a ' ... feature' of the 4116 that contents can ... -
MB02+IDE aliveLast weekend I finished soldering and testing my MB02+IDE. All items work perfectly on +2 grey, on +2A, on 128k heatsink and on 48k Issue2 and 3b tes…
... think about making a last lot of it. Some simple TTL ... will require the use of special gate arrays that ... this might be one of the last possibilities to get an ... boot program, 512 kB S-RAM (bufferd by a lithium ... about.
A lot of about 15 till 20 items ... -
SpecBAS 0.718 Now AvailableHi Folks! After an appreciable delay, the latest and (dare I say it?) greatest SpecBAS update is now available. We're moving into modern times with …
... linux build is now also available from [url]www.specbas.co ... have been busy for the last couple of days, destroying Dunny's ... -
New compression method: Exomizer 2After I finished working on optimizing aPLib's decoder, I was told that pucrunch did compress better, and while looking for info about pucrunch (it t…
... a level map instead of one byte, and run-length ... encoding of row and column data ... , but even the result of that should be compressible. ... decompressed, or just some of it? Can you work ... are still holding the last 1K of data it decompressed ... -
New compression method: Exomizer 2After I finished working on optimizing aPLib's decoder, I was told that pucrunch did compress better, and while looking for info about pucrunch (it t…
... a level map instead of one byte, and run-length encoding ... are still holding the last 1K of data it decompressed and ... [code]
message 1message 2 .... last message
[/code]
At ... /> Now, compressor scans occurencies of byte pairs in input and select ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... loading..... I use the top of RAM for IM2 table, stack, back ... (including screen$) falls well short of 65535.
I have ... me to use every single byte of memory, even to the point ... of having code and data immediately ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... loading..... I use the top of RAM for IM2 table, stack, ... (including screen$) falls well short of 65535.
I ... me to use every single byte of memory, even to the ... point of having code and data ... word boundary at the top of RAM, so I'd have ... -
Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …
... double checked the 4116 RAM in another Spectrum and ... operate on the next byte of the display. Because the ... during the read of the 2nd byte of the display in ... access to some of the lower RAM or perhaps some ... . This led to lower RAM corruption in another Spectrum, ... -
Beta/Sam/Master basic as spectrum ROMWith emulators being trivial to use to insert new ROMs into - and even in the physical world, RAM in place of ROM by use of a modified multiface or s…
... There really are hundreds of ambiguous decisions to make ... games. Plus an added RAM bank for holding extra ... s about 16K of ROM and 16 K of RAM used.
of the on-spectrum basics that became available - ... just wondering what sort of ROM Dr. Wright might ... -
Transferring +d images to real 3.5" diskTheres probably a tool out there to do it, anyone point me in the right direction please?
... I'm correct it's available on the SamDisk site.
last couple of weeks to copy dozens of PlusD disks ... -
Poking a string to memory...I'm looking to poke a string of characters including colour control codes to memory, I'm currently doing it by hand: 16,2,19,1,22,1,1,144 That equa…
... it out, a load of stuff got poked into 22528 ... the values for the location of where the string is ... assign an area at 50000 of 1000 bytes the DEFADD ... = 1000
then that area of RAM can be addressed as A ... is speed; a full 6912 byte SCREEN$ can be copied with ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... the last 9K T-states anymore, thus leaving over 30% of CPU available ... for the game.[/quote]
The current version (2.0?) of ... -
How many full time users of Linux on the forum?How many of you on WOS forum use Linux as a permanent OS replacement (excluding casual duel boot users who also duel boot Windows?). I use Linux Min…
... to double the amount of your computers memory. The ... because the inner area of the drive has quicker ... I set this to the last partition of the drive.
... to a combination of lack of time, lack of will power ... good open source games available, but 'Doze always ... -
New DivIDEIs this the only place to obtain a new DivIDE? [url]http://www.lotharek.pl/product.php?pid=25[/url] Tried to purchase a device from there, but am g…
... have an estimate of when will this version be available in your ... />
[QUOTE=velesoft;607364]And last version of classic DivIDE:
4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... as described in the last part of my post No. ... know exactly what the RAM access timing differences are ... means the column portion of addresses should be presented ... the single latch version of the circuit from ... tests relating to CPU RAM access (and in particular ...LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... other address at the end of compress.
of speed.
of some JR/JP can be reduce 1 byte, and use the last byte ... addres byte as ... br />
The use of RLD rotate bit in memory ...LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... /> ONLY the lower digit of reg A is changed. there ... to a Temporair 4bits heap of temporair data.[/QUOTE]Yes, ... B,[HL] ... Read low BC byte
LD [HL],E[/ ... />
The final value of reg A, is diferent.
last byte need be read in reg ...Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …
... times, ie you AND with ram in later loops ?[/QUOTE]
of RAM empty to ensure successful operation ... sacrifice for the efficient 25 byte code.
This was ...Routine for clearing screenI was looking for a 'nice' way of clearing a screen of graphics in Z80. After a ridiculous amount of time mucking around, this is the best and most …
... to keep the bottom part of RAM empty to ensure successful operation ... sacrifice for the efficient 25 byte code.
This was ...Snapshots (SNA) -> Keeping the loading screen?I've seen quite a few Snapshots (SNA) that kind of hesitate on the loading screen prior to entering the game menu... I quite like this. Anyone know …
... , SNA is a raw dump of ram and cpu registers. it's ... problem is it pushes the last pc onto stack thus corrupting ...BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…
... 9-. MY loading scheme - 1 byte, ECC
10-. MY loading ... scheme - 1 byte, ECC and error detected
byte
I resyn between ... 6 and 20 timer every byte [average resync is (6 ... Test it, get the last line of picture. set up or ...
