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SBC IX,DE/BCAlways wondered why there wasn't a SBC IX, DE/BC command.... so have to use PUSH HL ; save original HL PUSH IX ; IX on stack POP HL ; IX …
... to subtract, BC is the counter. Another note to be scribbled ... -
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…
... ld (cslice),a ;Set SLICE Counter
ld (cline),a ... ld bc,32 ;BC is counter for block copy
... /> cslice:
.db 8 ;Counter for SLICE
cline ... :
.db 8 ;Counter for LINE
cfield ... -
Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…
... /> ld b,a ; our shift counter
xor a ; a=0 ... -
Half-Life 3There's an interesting item on Computer and Video Games that suggests Valve are working on Half-Life 3. Although Valve have never publically confirme…
... -dead-3-looks-great-claims-counter-strike-creator/[/url] -
Fuse bug? Strange T state countingI was testing delay routine presented [URL="http://www.worldofspectrum.org/forums/showthread.php?p=214851"]here[/URL]. I'm reproducing its listing: …
... Fuse emulador, the T-state counter showed a difference of 148 ... -
analysing program variable usageIf I wanted to count the number of times each variable is referenced while a program is running (not the number of times each variable is referenced …
... variable; otherwise, update the relevant counter and RES 1,(FLAGX). Either ... -
My attempt to restore the CPU clock signalI know Winston has already got this, but I can't see any thread with details about it. Only wanted to share my (still early) results. I'm not taking…
I know Winston has already got this, but I can't see any thread with details about it. Only wanted to share my (still early) results.
I'm not taking about reshaping the ugly shaped clock signal available from the rear bus. I'm following a good ... -
Simple text scrolling routine...I'm having trouble writing a very simple text scroller, the idea is to use the ROM printer routine to print 32 characters each time the routine is ca…
... /> [CODE]org 50000-2
counter defb 0,0
ld (counter),a ;update counter with new number
ROM Calculator TrigHello, These Christmas holidays I finally have time to devote myself a little to the speccy . I have a question about how the ROM calculator implem…
... BREG.; this will be the counter for dec-jr-nz
counter BREG
DEFB FP_STK_PI_D_2 ; ... .; this will be the counter for dec-jr-nz
counter BREG
;X
...New version emulator ZEsarUX-2.0Hi I have uploaded a new version of my ZX80/81/Spectrum/Z88 emulator on [url]http://sourceforge.net/projects/zesarux/[/url] Changes are: Added Ca…
... /81 display bug and linecntr counter
Some other minor bugfixes ...Games without score/status panelAfter the previous thread discussing decorative borders/status panels, and watching the recent Spectrum Show, I noticed that with the exception of th…
... exception of the unusual time counter in the middle of each ...SpecBAS 0.830 Released!Hi guys - A new official release of SpecBAS has been released. The full changelog is below, but for now here's the download: [url]https://sites.goo…
... keyword handler after the frame counter
INCLUDE with an invalid ...Help for beginner with z80Hi chaps, I'm reasonably new with z80, but had a fair amount of experience with 68000, so decided to give a few things a go. One little thing I'm t…
... 's say I have a counter (from 7 to 0) and ...Sony TCM-919 Tape Recorder[img]https://dl.dropboxusercontent.com/u/15218813/TapePlayer.jpg[/img] Perfect working order, including pause, eject, volume, rev counter etc. Has …
... , including pause, eject, volume, rev counter etc. Has ear / mic sockets ...Match Day - Maximum number of goals (?) and a bug compilationGreetings. I'm willing to share some stuff about old Ritman's classic Match Day, so let's get on with it. :smile: PART 1 ------ I was curious abo…
... at the moment the clock counter is changing to 45 minutes ...Retro Base Ltd Streatham LondonI am staying at my Fathers place in South London, have lectured him on not staying up too late, drinking too much alcohol, eating properly and his ta…
... , but the guy behind the counter knew what he was talking ...z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
... ,10 - this is our delay counter
delay0 halt ??
djnz ...Success at recording WAVs to tape and them loading!Hi I thought i'd share my recent great experience of making reliably loadable cassette copies of games from TAP / TZX -> WAV -> audio cassette. …
... my shoebox has a tape counter and I've been writing ...Interface 1 ShadowROM pagingI read the Interface Shadow ROM Disassembly book. I wondered how that rom calls the interface's rom paging mechanism. It doesn't! I learned there is …
... Speccy fetches instructions. When program counter reaches 8 (error routine) or ...Chompston Mazes in SpecBASAfter the discussion in ASH-II's Pacman thread, I checked out the link there about generating 2D Pacman style mazes. This one was quite good fun, …
... same value - this is the counter for the number of builders ...Help With AY Music Program in BASICHi, last year I started writing a BASIC program for making and recording AY Music. I thought it would be easier than learning how to use Soundtracker…
Hi, last year I started writing a BASIC program for making and recording AY Music. I thought it would be easier than learning how to use Soundtracker but, in the end - I just learned how to use Soundtracker anyway (Thanks to ZXF for those tutorials!).
Problem with BC corrupting after DJNZJust for fun, I'm messing around trying to get the level maps from Lemmings to display on the screen with machine code. It's been ages since I did an…
... PUSH BC ; STORE THE LINE COUNTER
LD BC ... ,32 ; SET THE COUNTER FOR 32 CHARS
LDIR ... POP BC ; RETRIEVE THE LINE COUNTER
DJNZ LOOP2 ; DECREMENT THE ... LINE COUNTER AND LOOP
; I'm ...R registerI'm cross-posting this as a spin-off of a [url="http://www.worldofspectrum.org/forums/discussion/52748/zx-spectrum-cartridges/p2"]thread in "Hardware…
... CPU contains a memory refresh counter, enabling dynamic memories to be ... /> The data in the refresh counter is sent out on the ... can be considered a simple counter (instruction counter). It makes sense to ...Is H.A.T.E. bugged, or am I missing something?Had the game since I was wee, started playing it again recently and noticed this (I noticed it when I was wee as well); when you reach the end of som…
... are deducted from your lives counter. What's going on?New version emulator ZEsarUX-4.1Hi I have uploaded a new stable version of my emulator ZEsarUX 4.1 You can download it from the project page: http://sourceforge.net/project…
... new features: t-states partial counter, breakpoints on reading/writing port ...Retro ClassiX magazine scansThese are the only three issues I have of Retro ClassiX magazine produced by Graham Howard. Issue 14 https://www.sendspace.com/file/js7gft Iss…
... Retro ClassiX magazine at the counter, there were also issues of ...Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... tool and t-state cycle counter to show to the user ...Shimmering displayHi all, I've got a 48K issue 4S and it appears to be working apart from it's displaying weird vertical shimmering patterns. It passes a RAM test t…
... the Spectrum is doing, the counter before the ROM kicks in ...
