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Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …
... address by using the I register in the top 8 bits ... the state of CAPs+SYM shift to generate the ascii code ... routine that is able to register any number of ordered hooks ... -
unused assembler commands?Z80 processor has commands like OUTI OUTD OTIR OTDR INI IND INIR INDR.They deal with sending /reading bolcks ofinformation to ports. The problem is, …
... (such as a disk or microdrive) into a memory buffer. The ... about how the changing B register is going to affect things ... -
Multiple MicrodrivesWhat practical reasons are there for having more than one microdrive attached to a spectrum? Thanks
... two drives was that 'Outlet' microdrive magazine came out on two ... rotating a bit in a register. It doesn't matter how ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... can also be used to shift the contents of the screen ... in just by changing a register. It makes horizontal scollers a ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... can also be used to shift the contents of the screen ... for vertical scroll, with a register indicating pixel row to start ... of bytes in an internal register that stored the last pair ... a shifter, with shift amount 0-7 indicated by register. This could ... -
tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
Try and use the B-register for counters, as you can ... of the accumulator, and then shift them left 5 times. It ... faster to use rotate than shift, so you could rotate right ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... the sprite depending on horizontal shift in order to tackle colour ... point is SP1OR1 with the register setup as described just above ... -
Network cableSorry for almost flaming with all my... er.... two questions now...! ;) I read in the Microdrive 1 manual about network but I cannot find out what k…
... software resolves using the 'R' register to provide a random number ... have a link to your microdrive one please. -
horizontal shmupsare there any speccy horizontal shmups where you freely move your ship (or whatever) pixel-by-pixel except penetrator? (i?m glad to realize, the lack…
... />
I came across a microdrive of Terra Cresta the other ... - give or take the 'x shift space' positions (i.e. slightly ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... that allows us to register functions to run ... = 16; // initialize current scroll shift
g_scrollPos = g_textBuffer; // ... g_scrollShift = 15; // initialize scroll shift for next char in message ... -
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... and family) compatibility anyway (Microdrive compatibility would be a 'nice ... (low page register, high page register, W5100 mode register, W5100 address ... port number. The mode register can also be treated ... things like the paging register being read/write rather ... -
Minigame Compo 2007Hi there, also this year, there'll be a minigame competition, open to all 8-bit computers and consoles. It consists on writing games whose size (…
... bit is left in C register)
;basically, we shift bits out of (hl) to ... how to recognize we shift out the whole byte ... in effect RL(HL) shift out a data bit to ... the question is how we shift out for a example %00000000 ... -
Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
... 't have). I am switching register sets quite a bit in ... for me to use Symbol shift on the Spectrum. Typing "STOP ... the LEFT CTRL for SYM SHIFT? -
Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
... 't have). I am switching register sets quite a bit in ... for me to use Symbol shift on the Spectrum. Typing "STOP ... the LEFT CTRL for SYM SHIFT?[/QUOTE]
Not fixed ... -
Any BBC aware Specchums out there?After the UK101 and VIC20 emulators I've moved my sights onto emulating a BBC computer. This emulator will be different though in that it will be a Z…
... * File system support - writing to Microdrive from m/c. I need ... doku.php/library:zxspectrum:fcntl:microdrive[/url]
[url]http ... /z88dk/z88dk/libsrc/fcntl/spectrum/microdrive/[/url]
... will sort out what the register setup / return expectations of ... -
ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p
... value of the PC register in the register window by just using ... the IM mode via the register window. (If I'm not ... /> How's about I/F1 + microdrive features along with ZX printer ... -
ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p
... value of the PC register in the register window by just using ... the IM mode via the register window. (If I'm not ... /> How's about I/F1 + microdrive features along with ZX printer ... -
A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
A combination of R register, Shift and Xor usually does the trick
LD HL,seed
LD B,(HL)
LD A,R
RLA
XOR B
LD (HL),A
something as simple as this may do the trick...or maybe not... -
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... charcater
ADD A,A ;Shift A leftwards
DJNZ ... HL,BC ; temporarily use HL register pair for adding, but preserve ... -
Your help needed![FONT=Arial]there are [URL="http://www.worldofspectrum.org/neededscreens.html"]a number of titles[/URL] (146) that still lack an in-game scre…
... /> That is of course EXTENDED-SHIFT-9 to get [b]CAT ... to the arguably over-complicated microdrive syntax. Also the full manuals ... -
Keyboard routinesI'll ask here first - since this must be a long-ago solved problem, and hopefully I can avoid re-inventing the wheel... I need a keyboard routine th…
... 't perfectly make a Caps-Shift 0 on occasions). The other ... deliberately for all keypresses to register. Buffering keyboard inputs doesn't ... -
Keyboard routinesI'll ask here first - since this must be a long-ago solved problem, and hopefully I can avoid re-inventing the wheel... I need a keyboard routine th…
... 't perfectly make a Caps-Shift 0 on occasions). The other ... deliberately for all keypresses to register. Buffering keyboard inputs doesn't ... -
+3 BREAK-key in FUSEI'm trying to locate the +3 BREAK key (for use in D.I.C.E) in the FUSE emulator. However, reading the docs and reading the source does not immediate…
... .C.E. also uses CAPS SHIFT (alone) for something else. A ... managed to get it to register...
Now, the next ... -
The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…
... Spectrum 16kB (GASWARE set SP register also in high memory area ... keys is better test without shift (only keys 5,8,6 ... + NMI - software reset
RESET+SHIFT - start to USR 0 mode ... -
The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…
... ;shift paper colour to first 3 bits
AND #07 ;register A ... -
Sprites...What is fastest way for drawing masked sprites at any screen position without using preshifted data ? I want to use it for isometric view game... li…
... a look-up table to shift the sprite data as you ... , and (IX),d is 16bit register and 8bit relative(-128 +127 ... -
Sprites...What is fastest way for drawing masked sprites at any screen position without using preshifted data ? I want to use it for isometric view game... li…
... (IX),d is 16bit register and 8bit relative(-128 +127 ... comparison is made on the shift table being used' If ... it's zero shift the faster non-shift code is jumped ... at the MSB of the shift right table (the table ... the right following that right shift (ie the byte in ... -
C Programming question*bangs head* So not a c programmer. I know bitshifts are << and >> But what does <<= mean? I'm trying to work out an algorithm to implement in z…
They're shortcuts. What it's saying is 'var = var
