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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…
... RAM for IM2 table, stack, back buffer etc. This is set ... me to use every single byte of memory, even to the ... -
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…
... RAM for IM2 table, stack, back buffer etc. This is set ... me to use every single byte of memory, even to the ... -
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 …
... from the very first pixel byte (location 16384), which appears ... stops writing 2s one byte too soon and doesn ... ) instruction, the first pixel byte should be changed to 1 ... will have 0 written back to it and the ... location 16384 and write 0 back. If the value read ... -
Interesting speed increase...Hi Folks, You may already know the following but I found it "interesting". I have been developing a model railway timetable program in BASin for th…
... 's and breakpoints? Luxury! Why, back in my time, we had ... run the compiler, then scroll back through the 1000 odd lines ... code for .NET or Java byte code to run on the ... -
A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…
[QUOTE=Timmy;594378]Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how easy it actually is. (Actually I've already published this one some time ago, but this ... -
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.…
... ' the mod makes it wrap back to zero. The linear buffer ... ' to move to the next byte of the window you have ... -
rotating HL left through CarryI've tried this several ways, and it works for a while, then a particular value has a bit set in an inconvenient place and it all goes to pot. Eg: "…
... ; get a copy of top byte
RLCA ; push top bit ... /> LD L,A ; put it back into L.
[Edit ... -
Abbaye des morts[url]http://www.locomalito.com/juegos_abbaye_des_morts.php[/url] Looks like Spectrum, sounds like Spectrum, but it's not a Spectrum ('cause no colou…
... much of the scenary right back in there.. With a little ... jiggery pokery, we could put back the stain glass windows, the ... his feet (a non-zero byte from screen position), and directly ... , I will put some scenary back!!!!!! lol
Thoughts, anyone ... -
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.…
... @ -58%, which gets the compression back up to around what it ... for matches at least 128bytes back, but because a history match ... 512byte history table (a 2-byte address for each of the ... to a maximum of 2kb back, this being the size of ... -
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.…
... at RRD/RLD a while back, but they only seemed to ... deal with the constantly changing byte alignments that would otherwise cause ... -
Genius G540 programmer and GAL22v10B?I noticed in an Amiga forum Zetr0 saying they'd used a Genius G540 programmer to program GALs... I'm not having any luck with mine :/ I know this is…
... "read" the GAL it comes back as all ones
evenodd - byte order flag
romwr - 8k ... -
Fix attribute clash in emulatorWould it be difficult to implement a feature for an emulator that "fixes" the attribute clash on the fly in games?
... " Spectrum had graphics like that back in the 80s. World domination ... actually sets aside a whole byte, a colour code 0-255 ... -
Speed tip - "e" notationHi Folks, Whilst reading my "new" Sinclair ZX Spectrum BASIC manual I came across "e" notation again. In MRT I have the following line which is use…
... NXT-DGT-1 loop jumps back one byte too far, so it ... -
Speed tip - "e" notationHi Folks, Whilst reading my "new" Sinclair ZX Spectrum BASIC manual I came across "e" notation again. In MRT I have the following line which is use…
... NXT-DGT-1 loop jumps back one byte too far, so it ... . I assume the jumping back one byte too many is a bug ... -
Speed tip - "e" notationHi Folks, Whilst reading my "new" Sinclair ZX Spectrum BASIC manual I came across "e" notation again. In MRT I have the following line which is use…
... . I assume the jumping back one byte too many is a bug ... -
Is there a ROM modification (48K) for load without typing LOAD""?The target is to play with 48K machines with keyboard broken, or an alternative solution for new clones like Superfo instead of making a new keyboard…
...
; Now reduce the low byte of the Syntax table entry ... the first file-type indicator byte as well.
... .
DJNZ L0629 ; loop back to SA-BLANK till all ... IX+$01),$FF ; set first byte of ten character filename
Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code: [CODE] ;; ram-check L11DA: LD H,D ; Transfer the top value to the HL register LD L,E …
... new version leave RAMTOP one byte too high? You're doing ... leaves the loop, and decremented back to &0000 at the ... original ROM routine is decremented back to &ffff, which is ...BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…
... to a byte in contended memory to bring everything back into synch ...Decimals!Quick couple of (probably very silly) questions, folks... If I have an input command in a program asking "How many potatoes do you want to buy from …
... ON ERROR routine, which jumps back to the line & statement ... line & statement to jump back to a BASIC routine, from ... the machine stack in 3-byte multiples (return line + statement) terminated ...Store and restore attribute valuesI am needing ideas on how to write a machine code routine that will store/restore (more important to restore) attribute values to the 22528 area. I …
...
ldi ;move a 16 byte row to the buffer
pop bc ;get b back for the correct number of ... ,hl ;put hl back to buffer, de back to screem
pop ... bc ;get b back for djnz
djnz ralp ...about Back to SkoolHi All, Back to Skool today! :) [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0000362[/url] I got original tape and make samples for side a …
... that I tried to TZX back in the day. I guess ... that I wrecked instead and Back To Skool has just developed ... about 75% sure it was Back To Skool.
I ... you can drop the one byte and it'll still load ... of 8 for the last byte so dropped it using -ignore ...about Back to SkoolHi All, Back to Skool today! :) [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0000362[/url] I got original tape and make samples for side a …
... memory snapshot of Back to Skool that is byte-for-byte identical to ... you got as soon as Back to Skool came out, and ...ISO-Copy - Individual Software revisitedHi folks In another thread about Supertape: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36203[/url] ... we touched on ISO-Copy by th…
... other than spectaculator (even convert back to wav :-)[/QUOTE]
byte block. I remade the three ... fail in Spin.
Back for some tests, including pulses ...Freddie Laker's Airline CapersA game with the above title was added in yesterday WOS update. [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027482[/url] [IMG]http://www.…
... made any proper Spectrum games back in the day, just lots ... and one or two hex-byte-entered attempts
at machine ... ) and didn't
get back into Z80 for.. quite a ...Freddie Laker's Airline CapersA game with the above title was added in yesterday WOS update. [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027482[/url] [IMG]http://www.…
... made any proper Spectrum games back in the day, just lots ... and one or two hex-byte-entered attempts
at machine ... ) and didn't
get back into Z80 for.. quite a ...Outrun Europa in colourSwainy suggested that he'd like to try his luck with Outrun Europa colorful graphics and see if they can be improved. Let's give him the chance :) A…
... it'll be blue on back and on grass blue on ... :
# read sprite graphics byte
# search for first leftmost ...Playing SID music on AY??Hello. Some time ago, with occasion of another thread, I was asking about possibility of making a very certain thing - a SID emulator for Spectrum …
... with AY plugged in the back), if the CPU is up ... -page to a different 256-byte page, the rest of it ...Outrun Europa in colourSwainy suggested that he'd like to try his luck with Outrun Europa colorful graphics and see if they can be improved. Let's give him the chance :) A…
... file with the data as byte code, but I thought a ... some?"
"Grandma from the back seat offers you some PCP ... bang your daughter in the back seat, will you let him ...Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
Well, there is a horizontal byte-wise equivalent but it's ... and want to wrap around back to the start of that ... change HL to send you back to the start of the ... the end, it'll jump back to the start of the ...Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... insert a 0 bit sign back into mantissa (always positive)
byte
ld a, l ; exponent ...
