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Z80 RRCA instruction...Hi Folks, Well my exploration of Z80 MCODE continues apace! I am struggling to understand how the RRCA instruction works. The official Zilog manua…
... (Shift Left Inverted Arithmetic), sometimes also denoted as SLL (Shift Left Logical). SLIA shifts register left ... -
fixed point mathsI came across this site which is quite interesting [URL="http://z80-heaven.wikidot.com/advanced-math#toc18"]http://z80-heaven.wikidot.com/advanced-ma…
... be named [B]SLL[/B] (Shift Left Logical) officially. However, since it didn ... name it [B]SLS[/B] (Shift Left Set) instead.
Both ... -
Is it possible to make the Z80 execute a bizarre instruction?What happens when it gets an unrecognised instruction OP Code, I mean something following a #ED that isn't one of the undocumented instructions eithe…
... for a set of SLLs Shift Left Logical operations that were not documented ... -
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…
... 426045]
There are different shift and rotate instructions depending on ... u is unsigned, does a logical shift
s >& ... is signed, does an arithmetic shift.
You can ... ; 1
does a logical shift
and
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…
... u is unsigned, does a logical shift
s >> ... is signed, does an arithmetic shift.[/quote]
Which C ... to? C99 explicitly leaves right-shift of a signed integer as ...Machine code issue...Hi Folks, My trials with MCODE continue and I am stuck. I wrote the following program in BASIC to simply POKE an attribute byte in to a "box" on th…
... ]
That's a logical shift and won't preserve the ... you can do an arithmetic shift with:
SRA H ... it's usually better to shift left than right if you've ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... [B]L[/B] for [I]logical[/I]. Arithmetic shifts can be ... for the left shifts, it would be expected that a logical shift would ... the arithmetic shift would do exactly the same as the logical one ... should better be called SLS (Shift Left Set), because it enters 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…
... L
srl l ; shift right logical
srl l ; to produce ... to A
rla ; rotate left accumulator
sbc a, a ...P.O.W.As far as I know, a port of P.O.W. (Prisoners of War) from NHK, doesn't exist. [img]https://cld.pt/dl/download/61d19b5e-453b-489c-b17b-d3ed6fccd594/…
... /> moving from left to right you will need to shift bit 7 ... , but it's in fact logical, since we are working 4 ... ), with whatever value you will shift left, i.e. what enters at ... and logical imposition, memory should be processed from right to left (Not left ...Worst. Controls. Ever.Right... time to have a vote on the worst keyboard controls ever! Here's some suggestions to start you all off: (1) The standard cursor keys. Need …
... as Sabre WUlf, with 6=left, 7=right, 8=up, ... (4) Super Robin Hood. A=left, X=right, K=up, N ... up/down and which was left/right...
(5 ... T=up, B=down, F=left, H=right, 4=fire. ... " contender: Jumping Jack. Symbol Shift=left, Space=right may have worked ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... bit 0-2
rlca ; shift
rlca ; five
... screen address
; left nibble on left hand side
rrca ; shift right
rrca ; four ... byte of font
rlca ; shift left
rlca ; four bits
Dirty SpectrumsI have a Spectrum+ computer which has come from a smokers house unfortunately. Although coated in nicotine (I hate to think the state of their lungs…
... not work - EXTEND MODE, SYMBOL SHIFT (left hand one), " andMerlin has risen from the grave!Those of you following the Merlin saga [thread=29902]over here[/thread] might be slightly interested to know that the program is now available in the…
... or keys:
CAPS SHIFT - Left, CAPS SHIFT + M - Left + Up
Z - Right ...DK?Tronics keyboard troubleI have a DK?Tronics keyboard here, which is causing some trouble. Physically it?s in great shape, but some keys simply do not work. The non-working k…
... , d, j, k, Symbol Shift, Left Caps Shift
and on the ten ...Rendering clipped glyphSometimes you need to render a glyph of arbitrary size to the screen. And clip it. For example: drawing a mouse cursor means combining drawing of a…
... that you will need to shift everything 2 bits to the ... the optimal generic algorithm to shift for N bits...also note ... sometimes it is faster to shift left for the same effect).
Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…
... ; hl = E * H
; shift left eight bits
ld ... an 8x8 multiplication and shifts left 8 bits.
The ... call+ret and 8-bit shift left, costing an additional 43 cycles ...Tutorial: Using UDGs in SpecBASSpecBAS is capable of using graphics mode, in a similar manner to the original Spectrum. Like most things though, the extended nature of SPecBAS's ab…
... Shift+9. On SpecBAS, there are two methods:
Left-Ctrl + Left ... -Alt: Temporary graphics
Shift + Left-Alt: Permanent ... graphics mode until you press shift+alt again.
left of the byte) to ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... pixels shift left
256 - 3 pixels shift left
256 - 4 pixels shift left
256 - 5 pixels shift left
256 - 6 pixels shift left
Games that have become part of your history ...I started playing Starquake form Bubble Bus software in the mornings for a while before going to school as it was a great unplug. I still play and h…
... button... (if you press CAPS Shift+LEFT+RIGHT the whole memory - whole ...Podder (1986)An obscure game that sold for just 99p back in the day, it's not bad actually. But having played it for a couple of days, I have nowhere to go. Basic…
... behind the tank with Shift+Direction (eg. Shift+Left to drop a mine ...D80s and multifaces etc..Hi everybody, Just wondering, is there any known good way of taking snapshots onto a D80 disk? If not I'm thinking of writing a new ROM for my multi…
Have you tried pressing CAPS SHIFT + LEFT ARROW + RIGHT ARROW? ;)
[ This Message was edited by: FRGT/10 on 2006-03-06 18:46 ]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…
... = 16; // initialize current scroll shift
g_scrollPos = g_textBuffer; // ... g_scrollShift = 15; // initialize scroll shift for next char in message ... causes the scanline to shift left one pixel, leaving ...Games on a D80 based systemHi everybody..... I need to satiate my urge to play Knight Lore. Never did finish that game. To do so I need a good way of getting it onto at least…
... Kompakt when you press CAPS SHIFT + LEFT + RIGHT, it saves the memory ...MGT2TAP ReleasedThere are some goodies included: Real Disc reading/writing, consistency check, Screen viewer, automatic syntax replacer... You can find MGT2TAP on my…
... +A.
Left shift key whilst pressing left mouse to select multiple ... ). :Surprise: I have not activated Left shift+Left Mouse button. Maybe it is ...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 = varshifting spriteshi. have anyone experience with shifting sprites by table ? some neat tricks ? i don't want to see complete code (really don't want, it trashes thr…
... of the sprites also shift them across by 2 ... animate as they move left or right. The disadvantage ... What really slows down a shift left/right by n pixels using ... far you have to shift the pixels left or right, it ... where you can more easily shift 16- and 32-bit ...Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
Any letter consist of 8 codes.
First code do nothing (it is a blanc)
next 2 shift to rught
next 2 do nothing
next 2 shift left
last code do nothing.Brand new Horace GameWe could think on how should the next Horace Game be, taking in account that the past three are mixtures of old, well established classic arcade game…
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You update the scroll (shift left) area while ULA is drawing ...Brand new Horace GameWe could think on how should the next Horace Game be, taking in account that the past three are mixtures of old, well established classic arcade game…
... ;459992]You update the scroll (shift left) area while ULA is drawing ...
