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Dud 48K rubber key versionMy Rubber key speccy has been dud for quite some time, but I've just not bothered with it as I also have a Spectrum + and a +3. The problem is this…
... /> Get a multiface, and go to address 32768. Open the hex window ... of zeroes.
Change an address to 85 (0x55).
Check that ... ONLY the address you changed actually changed.
Change an address to 170 (0xAA).
Go up ... -
Dud 48K rubber key versionMy Rubber key speccy has been dud for quite some time, but I've just not bothered with it as I also have a Spectrum + and a +3. The problem is this…
... /> Get a multiface, and go to address 32768. Open the hex window ... of zeroes.
Change an address to 85 (0x55).
Check that ... ONLY the address you changed actually changed.
Change an address to 170 (0xAA).
Go up ... -
Z80 Cross-assemblersI need to build some code which contains sets of routines which run at one address but are stored elsewhere. Unfortunately, neither of the assembler…
I usually just compile it with the correct address to a BIN file, then include that file at the storage address. Simples. -
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…
... />
Just trying to implement this routine in to my timetable program ... SEED was being reset due to the Proportional Print routine which ... do so, I just want to check that my "fix" for ... is use a different memory address to store the SEED and adjust ... -
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…
[QUOTE=Paddy Coleman;585510]I believe all I have to do is use a different memory address to store the SEED and adjust the machine code accordingly. Is that correct?[/QUOTE]
Yes, it is indeed.
Patrik -
Arkanoid Hack - Your Sinclair Smash TipsRemember that Arkanoid hack in YS Smash Tips that didn't work? It does now... [CODE] 10 REM ARKANOID HACK 20 CLEAR 65535: LET C=1: LET D=23295 …
... dcbuff equ $61a8 ; address to copy decrypter to
;
loader ... preserve decrypter address
ld de,dcbuff ; copy decrypter to
address
pop bc ; ... add together for next decrypter address
pop bc ; ... -
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 …
... you need registers to track the destination screen address and you need ... cpu cycles to compute the next screen address to draw to ... data is copied to screen, the destination screen address is retrieved from ... -
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 …
... you need registers to track the destination screen address and you need ... cpu cycles to compute the next screen address to draw to ... data is copied to screen, the destination screen address is retrieved from ... -
Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…
... /> Why do I get the attribute address instead of pixel addres in ... bright attribute at pixel position, how do I get the bitmap address? -
Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... Metalbrain;594803]Using PUSH to write into the screen ... the destination addresses, but to fetch the data, ... or the other memory address to allow for the fact ... directions. You have to make the decision which ... keep adjusting the source address. If you're writing ... -
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…
... the 5C ULA was different to the 6C, which would affect ... that is being affected. Address to RAS to CAS relationships are very tight ... for long enough for this to happen - particularly if you're ... in series, followed by 47pf to gnd (see between IC23-pin ... -
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…
... that is being affected. Address to RAS to CAS relationships are very tight ... for long enough for this to happen - particularly if you' ... from a wrong address.
I'm going to study the ... be helpful. It seems the address selection is driven directly by ... -
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…
... you were using it to control latches or address mux.
If you suspect the address not being registered properly, then ... the operation of your circuit to allow the address to stabilise etc. -
SAGE gamebook project newsThat's the Spectrum Adventure Gamebook Enhancement, that is (for the time being, anyhow). I've updated the [url=http://www.users.globalnet.co.uk/~jg2…
... by accident as an extension to the AGES gamebook solver ... list. I've changed to using a 42-pitch character ... used compression algorithms all seem to need more resources than the ... disregard for appending my email address to postings, but fortunately Google excise ... -
Copying a SCREEN$ in ZX BASIC in 1 second?!Following on from the revived "[thread=20207]Saving a complete SCREEN$ in BASIC[/thread]" thread (although Arjun really only needed a suitable POKE i…
... /> Using a separate DEFADD area to hold single letter variables outside ... of caveats to this technique when using LET to copy to a DEFADD ... .
To avoid this problem, to do for example:
address to store the 9 bytes of ... -
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]…
... regular screen attributes (corresponding to multicolor area) with zero ... identikit style graphic engine to produce variable character ... can be easily adapted to generate colored graphics. ... feasible, reserving certain attribute values to be replaced when drawing ... -
Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
... pages. It's advisable to do your transfers with ... REUBICA" routine should be changed to something like this:
[ ...
di ; critical section, to be executed without interrupts
to Bank+1 address to change which RAM bank to write to
... -
Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
... you switch to 48K using PRINT USR 0 (to not to disable ... BANK_M system variable is reset to 0.
Your ... still uses this variable to switch back to the previous state, but ... ;POKE to Bank+1 address to change which RAM bank to write to
... -
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 …
... [B]OR (IX+0)[/B] to [B]AND (IX+0)[/B ... could be a nice attribute fade-to-black effect to finish it off..! :-) -
Spellbound 48k issues with ToastrackIve been busy converting a lot of games to +D disk, everything was going smoothly until I tried Spellbound, loading in 48k mode on the toaster it res…
... does a headerless load equivalent to LOAD ""CODE 26064,39470
to modify the USR address to avoid the "Hello ... RANDOMIZE USR routine to the wrong address. The real address is USR 26627 ... -
New category of "commercial" gamesHi Martijn, I was thinking about an idea which I already commented, but in a rawer way before. Its about these games that we know were released comm…
... release, and re-release. To my experience with the spanish ... software company that supplied copies to high street chains like WH ... with the software company's address to order from.
... , a little, your desire to demote titles like home grown ... -
Games with time travel mechanics?What games involve time travel or time control in their gameplay mechanics? I don't mean games where time travel is just part of the story (i.e. it's…
... , then goes back in time to co-exist with your earlier self ... ]or where you can jump to any point in game time ... the game) and make changes to the game world and those ... -
ROM switch on NMIHello! Please, help me or point in the right direction. I am building a project for 48k spectrum which must activate its rom (actually static ram) …
... br /> To page your memory, intercept the M1 cycle at address 0x0066 ... So, sampling address bus at M1 falling edge seems to be unreliable ... say, 10ns, to wait it stabilize and then get the address.
address to the
memory has had ... -
Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... gone on behind closed doors to make turkwel leave I guess ... freely use code provided you attribute it to the author is not ... -
Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... freely use code provided you attribute it to the author is not ... (abuse) are being used to claim copyright (and monetary reward ... we have an explicit condition to make the acknowledgement viewable ... something specialized you would have to do something unique in ... -
UK Sports CentresWhen they made the Britas Emipre, I bleive the writers must have been to a fair few British sports centers. Despite the series being early 90's, many…
... of these places manage to open until 10 or ... Thursday[/I] is going to be swimming-club-members-only ... vary this to let the public in to at least ... the temptation is there to stop caring entirely about ... ss-about, exactly timed to co-incide with school summer ... -
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 …
... am needing ideas on how to write a machine code ... store/restore (more important to restore) attribute values to the 22528 area.
I am only wanting to ... hl ;put hl back to buffer, de back to screem
pop ... -
What if there was no memory or space limitation?What if there was no memory or space limitation? We've had topics about the limitations of the Speccy's hardware, topics where we discussed how good …
... and then copy from that address to wherever you want. However, if ... -
What if there was no memory or space limitation?What if there was no memory or space limitation? We've had topics about the limitations of the Speccy's hardware, topics where we discussed how good …
... and then copy from that address to wherever you want. However, if ... -
Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…
... /> ld (hl),4*8 ;default attribute
inc hl
inc ... />
it scrolls whole attribute area to the left with filling right ...
