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Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... (12T)
add a,a ; shift EAR bit into sign bit ... />
By committing the C register for reading port 0xFE, I ... This does cost me one register, but 47loader hasn't used ... would mean committing the B register to be 0xFF permanently so ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... precisely equivalent to a left shift, [i]and[/i] sets the ... locked in using the C register, forgetting that it wasn't ... bit.
The A register then sets the upper bits ... -
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…
... very random (using the XOR shift). I don't understand your ... what's in the A register when it hits the end ... - it's just the A register. Doesn't matter if it ... -
Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... want to open (2) into Register A.
CD0116 ; CALL 1601h ... the box. no more pure linear code structures.. oooohhhh....
ANN: Spud v0.225New version of Spud for anyone who's interested. Some new features. [code] v0.225 ADDED: Load & Save Binary Files. ADDED: Manually trigger NMI. A…
... the screen, containing debugging information (register views, flags, status of extra ... , as that should be [CAPS SHIFT] + [0] in the emulated Spectrum ...ANN: Spud v0.225New version of Spud for anyone who's interested. Some new features. [code] v0.225 ADDED: Load & Save Binary Files. ADDED: Manually trigger NMI. A…
... the screen, containing debugging information (register views, flags, status of extra ... , as that should be [CAPS SHIFT] + [0] in the emulated Spectrum ...ANN: Spud v0.225New version of Spud for anyone who's interested. Some new features. [code] v0.225 ADDED: Load & Save Binary Files. ADDED: Manually trigger NMI. A…
... the screen, containing debugging information (register views, flags, status of extra ... , as that should be [CAPS SHIFT] + [0] in the emulated Spectrum ...What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... the 'object' register apart
... L
register.
LD ... EAR.
RRA Shift the byte.
...SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…
... [*]All symbols accessed via symbol shift only.
[*]ANSI BASIC-78 ... hi-res.
[*]IY register available in interrupt mode 1 ... mode on reset.
[*]Shift in CAPS mode gives lower ... variable space accessible via IY register.
[*]Works with esxDOS ...LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…
... ]
RL B ; shift carry into B-register (always 8 Tstates), resulting ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> cp 40 ; check for shift + alphanum
ret z ... ; clear D register
cp 39 ; shift or no-key?< ... ':' ; jump if digit, return, shift
jr c, k_digit ; ... '0' ; digit, return, space, shift, alt?
ret c ; return ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... it
call fp_to_a ; get register byte
cp 17 ; check ... range
ld bc, ay_reg ; register port
out (c), a ... ; store L
srl l ; shift right logical
srl l ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> exx ; alternate register set
ld a, 128 ; shift f by
exx ; main register set
call shift_fp ; shift bits
exx ; alternate register set
pop hl ; unstack ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... :
exx ; alternate register set
sra l ; shift right arithmetic L ... :
exx ; alternate register set
rr h ; shift HL'
rr ... br /> exx ; alternate register set
rr b ; shift BC'
rr ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
...
exx ; alternate register set
push hl ...
exx ; alternate register set
push hl ... , at each shift
exx ; alternate register set
... HL'
exx ; main register set
and a ; ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... and 6
rrca ; shift
rrca ; right
exx ; alternate register set
jr scan_ent ...
exx ; alternate register set
push hl ...
exx ; alternate register set
pop hl ...z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…
... uses CAPS and SYM shift to act like SHIFT andCTRL keys on ... simple programs) or you could register the two (or more) interrupt ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... add a couple more linear screen effect variants before ... 244&authkey=!AF5T0-YPSiEeP_4"]Linear converge[/URL]
[*][URL ... 786750D7B39FEA33!243&authkey=!ALfxf9JOBtP0wKg"]Linear diverge[/URL][/list]
... 'll be no visual feedback after the screen has ...Lime Rick, like Snake but with gravity[B]Lime Rick[/B] by [url=http://www.kissmaj7.com/games/]Kissmaj7[/url] is an elaborated version of "I Left Myself Behind". It's a puzzle game with an…
... /> Anyway, because I always consider feedback, here's a cleaned up ... here's an attempt to shift the apple up. It only ...IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... can't access the h register
[/code]
You ... .
Including the 'broken' shift instructions there are over 100 ...128k gamesHi. I've come to World of Spectrum for advice. I'm a Commodore guy OK, please be nice to me, as I seek your wisdom! I love the Commodore 128, and I'…
... , while the 128K has one register that covers all the extra ... worked well when a non-linear game didn't have to ... popular disk drive, so non-linear games tended to be disk ... .
So... a non-linear, solid-filled vector graphics game ...Deterministic random number generatorI'm looking for a random number generator in assembly which, given a seed, the generated sequence is always the same. You change the seed, you get a …
Patrik's XOR generator is a good one but it only generates 8-bit numbers (again a plus if that's all you want!). If you want random numbers larger than 8-bit you have to call the function several times and piece together the results, which degrades the ...Is ESXDOS flexible enough to incorporate e.g. Spectranet commands?I was just discussing the idea with someone about the wish some people have to be able to combine interfaces such as DivIDE (Plus) / DivMMC EnJOY! wi…
... and identified in the A register.
[code]
... is a buffer allocator and linear buffer data type for reading ... the road I need a linear buffer with insert/append/read ... I should have written this linear buffer type first and then ...Does this addressing technique have a name?Hi All, Bit of a weird/unnecessary question, but can anyone help build on my knowledge of asm terminology by telling me what the *second* method of …
... thanks for your views and feedback on this. It all makes ... bytes load back into a register pair in *reverse order*, I ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... , your screen buffer is in linear order instead of Spectrum screen ... through them with a spare register like IX.
Also ... Stack Pointer as an extra register and read/write two bytes ... ' to swap to the alternate register set for another 8 bytes ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... , your screen buffer is in linear order instead of Spectrum screen ... Stack Pointer as an extra register and read/write two bytes ...Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…
... difficulty to do a linear buffer as it is ... this non-linear one but the non-linear one requires ... seems. You have a register pair dedicated to the value ... whereas with the non-linear method is amortized to ... speculated that the non-linear order of the buffer ...RTC module for DIVIDE[IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_top.jpg[/IMG] [IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_bottom.jpg[/IMG] [IMG…
... used for select number of register in RTC chip. All RTC ... + A
RLCA
RLCA ;shift buttons at end of byte ... fire buttons
;and in register B will always state of ...Face-Off: ZX Spectrum vs. Commodore 64I found an old oldish, but very informed and interesting article on the ole Spectrum vs. Commodore 64 argument. The article explains the technical d…
... C64 [I]had[/I] to shift the whole screen; it couldn ... a bit of planning (any register write happens pretty much when ...Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... the C64 attribute layout is linear. [I](EDIT 1: not true ... using the spectrum layout would shift you 8 characters to the ...
