-
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 …
... br />
1* Don't shift it. Have eight different sprite ... : LLLLLLLL GGGGGGGG XXXXXXXX
after shift: ???LLLLL LLLGGGGG GGGXXXXX
[/ ... indicates the amount of horizontal shift needed so the MSB of ... carried forward in the L register. L is set to 0 ... -
BIT/RES/SET b,r where b is variableWhat's the best way to use the bit flag group of commands if it's not known in advance which bit should be referenced; ie. where it's dependent upon …
... /> Probably better to set a register to the bit pattern you ... .
You can use shift rotate instructions to move the ... -
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 …
Thanks Guys for your +ve feedback on the LFSR ....
[ ... H (before rotation) by C register (=192) and also keep on ... -
Tech Demo of my Latest Game (FADV)Posted in development as technically not a new release just a tech demo of a new game I'm working on. Ok here a tech demo of my latest full game, i…
... for all the replies and feedback. A few replies:
[LIST ... Speccy memory. Massive change to shift to anything else including rewritting ... -
The most powerful 8-bit machine, and CPU?Further to the discussion in: [url]http://www.worldofspectrum.org/forums/newreply.php?do=newreply&p=621787[/url] What actually is the best 8-bit ma…
... the U register) with a single instruction, allowing you to shift memory ... -
1tracker - Beeper music editorSince Beepola hasn't been updated for long time, and there were some few new music engines created and few old ones found, there is certainly a need …
Some more testing feedback. I must admit I'm ... insert a copied block with shift, rather than paste over present ... -
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…
... ,24" before the second "call SHIFT" so that both calls address ... routine as vram is not linear. maybe enough is to check ... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
... of them - congrats! The I register crash emulation is pretty interesting ... CTRL keys as Caps/Symbol Shift as well as the left ... /right Shift keys. I've become used ... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
... of them - congrats! The I register crash emulation is pretty interesting ... CTRL keys as Caps/Symbol Shift as well as the left ... /right Shift keys. I've become used ... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
... of them - congrats! The I register crash emulation is pretty interesting ... CTRL keys as Caps/Symbol Shift as well as the left ... /right Shift keys. I've become used ... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
I've had similar feedback from users of Zero (apart ... way. At least for the shift keys if nothing else as ... as the normal speccy Symbol Shift key. But if he presses ... . Both will work. Both the shift keys work as the usual ... -
JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…
... 629101]I've had similar feedback from users of Zero ( ... At least for the shift keys if nothing else as ... as the normal speccy Symbol Shift key. But if he ... will work. Both the shift keys work as the usual ... speccy shift keys.[/QUOTE]
... -
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…
... /> ; Renormalize:
; Now we must shift mantissa left until highest bit ... /> ld a, e ; Use A register for rotating E faster (using ... /> ; Now undo last mantissa left-shift once
ccf ; Clears carry ... -
GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…
... 631614]why people think that linear buffer is faster ?[/QUOTE]
linear frame buffer is quite ... use one half of a register pair as the current line ... buffer wasn't a chunky linear display, but a planar ... I think each plane was linear, though) -
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…
... - for example, the xor-shift is extremely simple and yet ... the magic constants for the shift operations so the resulting ... with diehard - but even 32bit linear congruential generators fail about twice ... diehard tests than this xor-shift.
OTOH, it ... -
The complete Spellbound (48k) RAM disassemblyHello everyone. I just wanted to share the fruits of almost two years' labour; I've produced a [URL="http://www.dur.ac.uk/philip.anderson/disassembl…
... routine description (which would show register names and input values in ... />
Anyway, thanks for the feedback, and for creating SkoolKit, and ... -
Some more PC questions1. Since we ended up discussing Linux in another thread, it made me wonder is Linux really, objectively faster than Windows? I mean, can you run, say…
... exceptions: Z80 has 16 bit register pairs, M68K has 32 bit ... . The shift from x86 to x64 doubled the general purpose register count ... -
ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... in 128kB mode)
;correct register R value for all snapshots ... Z80/SNA files.
;correct register R value for all snapshots ... menu - start if hold key "SHIFT" during loading snapshot
;free ... -
ZX-Art!!Look at this wonderful collection of spectrum pictures. :) [url]http://zx.maros.pri.ee/eng/top-100/[/url] I really enjoyed looking at this art galle…
... -100/[/url]
Please register (it's quick, no captchas ... ) and vote - authors need Your feedback and an archive needs Your ... -
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... />
If we shift the marker bit (A register was $80 and ... -
AY-3-8912 emulationI am trying to improve the emulation of the AY-3-8912 in FBZX wii. I studied the code of some emulators and read some documents. I would like to be…
... is indeed 17 bit feedback register, and that the feedback is bit0 ^ bit3 ... -
CAPS SHIFT on Spectrum+ ComputerI have just recently supplied a couple of replacement Spectrum+ keyboard membranes to a customer in Barby, Germany. Although something may have been…
What were the symptoms exacly, would it accept the key but not register the shift? If I do shift-b I get no keypress at all. -
Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…
... output enable signal with internal feedback
DOE NODE istype 'com ... );
//ZDATA is 8bit register for backup last writed value ... -
Survivisetction .tapI found on some site about Atari :lol:a link to something like .tap version of recent great Russian Spectrum game Survivisection. I don't know if it…
... as "fire/select" and right shift as "go"[/QUOTE]
XOR A ;reset register A ( ??? ERROR ??? - here must be ... -
Machine code loopsDear all, 30 years too late I know, but I'm finally starting to get to grips with Machine Code - something I could never manage back in my early tee…
... =zero.
The flag register is affected by block transfer ... , the logical operators, rotate & shift commands, BIT, the various IN ... -
Machine code loopsDear all, 30 years too late I know, but I'm finally starting to get to grips with Machine Code - something I could never manage back in my early tee…
... =Battle Bunny;704391]The flag register is affected by block transfer ... , the logical operators, rotate & shift commands, BIT, the various IN ... -
generating a pre-defined list in an un-defined sequenceI've decided to become a drunkard, to which end I've been drinking a whole bottle of beer in one day (whereas normally I'd make it last 2 or 3 days).…
A galois lfsr is simpler to implement. Here's a version that (might) work:
[code]
start:
ld de,0 ; repeat 65536 times
ld hl,$3141 ; initial lfsr state
lfsr_galois:
... -
30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... data you'd need to shift I'm wondering if it ... "]28 columns reading from a linear buffer[/URL]. And I doubt ... -
Redefine keys routineHow would I go about making a memory efficient redefine keys routine? I only want to define up, down, left and right and reserve key 'H' for pause.…
... also look for sym/caps shift modifiers:
[code]
; do that here. Register A should only have one ... the
; current one (complement register B) should return no key ...
