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Short Z80 QuizQ1) Which program gives different result ? A) XOR A ADD A,A B) XOR A ADC A,A C) SCF ADD A,A D) SCF ADC A,A Q2) What is the equivalent of NEG …
Screen LoaderCouple days ago i find very interesting loader routine in ex Yugoslavia magazine "Svet Kompjutera" from january 1987. Authors of article, calls this …
...
LD DE,18600
SCF
CALL LFED5
EI ... /> OUT (&FE),A
SCF
RET
RUT ...Urgent Help needed to fix this: calling all machine code gurusI am currently trying to write tutorials on the amazing Orfeus music composer by Proxima which allows you to do multi channel music through the beepe…
A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…
... , do I need to use 'SCF' every time I call $0556 ... like this?
[CODE]scf
ld a,255
So you want to make a cardgame......but you haven't got a good deck to display. Well here is a fully relocatable routine that will do the job for you. Place the code anywhere in me…
A fast DRAW routineI was investigating how to speed up the line drawing for the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20225"]BASIC compiler[/URL]…
... br /> xor a
scf
LOCAL __PIXEL_MASK
... />
exx
scf ; Sets Carry to signal update ... ld d, e
scf ; Sets Carry to signal ... carry on F'
scf ; which flags ATTR must ...A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…
... " loop, the carry is set (SCF).
Then, a RL L ... to MIC
SA_BYTE
SCF
SA_BIT:
RL L ...Saving and Loading from tape in MC?I'm actually having problems with saving and loading from the ROM routines for the interpreter... I'm currently using the following codes for saving…
machine code loadercan someone have a look at this loader and break down what its actually doing and also how i can stop it from executing the 2 loads of headerless blo…
... LD A,FF
5B23 SCF
5B24 CALL 0556
5B32 SCF
5B33 CALL 0556
Lord Of The Rings; Files skipped ?Hi folks, Does anyone know what blocks 8~13 are for in the Lord of The Rings: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0006601[/url] I…
... LD A,255
61574 SCF
61575 JP 01366
61580 SCF
61581 JP 01366
editing strings with INPUT LINEHere's the latest in my unpredictable series of utility routines. This one I needed for the SAGE game editor; it emulates INPUT LINE l$ but with the …
Multicolour demo using z88dk + BIFROST* (+source)This is just a demo to show how to show multicolour using z88dk, using the BIFROST* engine (more info [URL="http://www.worldofspectrum.org/forums/sho…
... /> // Loading Tiles
#asm
scf
xor a
ld ... , 17
call 0556h
scf
ld a, 255
// Loading Engine
#asm
scf
xor a
ld ... , 17
call 0556h
scf
ld a, 255
40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... hl,overscratch
nextovershiftline
scf
rr (hl)
inc ...SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
I can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recently. I have posted the details in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=20345"]this ...New Z80 CPU emulation testerI have finally wrapped up the new [URL="http://zxds.raxoft.cz/taps/misc/z80test-1.0.zip"]Z80 tester package[/URL] I have previously announced in [URL…
... thread[/URL] regarding the authentic SCF/CCF behavior. All of the ... ZEXALL replacement and test the SCF/CCF behavior. Feel free to ...Works in Fuse & SpecEmu, not ZXSpinI decided that I wanted to change the scroll routine which I was using for compiling the Trailblazer maps, as I'd just copied it out of Andrew Hewson…
Adding a pause key to ArkanoidHaving rediscovered the simple pleasure of playing 1980s games on genuine 1980s hardware, I've also remembered that emulation can provide a feature m…
JSW2 - Game Loader DifferencesThere are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it …
There are three official releases of JSW2. I'm not counting the 'JSW2-128' version here as far as I'm aware this was not in any way 'official' as it incorporates a built in cheat mode. Feedback on this point is appreciated. To quote the readme:
Ghosts n' Goblins loaderI'm trying to put Ghosts n' Goblins onto a +3 disk but struggling to understand the mc loader. Basic loader [code] ink 7 : clear 25000 : load "" cod…
... : OUT (254), A
65222: SCF
65223: RET
65286: SCF
65287: INC D
65475: SCF
65476: RET
dumping protected BASIC loadersI wrote this a few weeks ago but forgot to post it. It will load & list from tape/TAP/TZX any BASIC program which has been saved with SAVE, including…
JSpeccy 0.93A new JSpeccy version has been released. Summary of changes, - Drag & Drop support forTAP/TZX/CSW/SNA/SP/Z80/SZX/ROM files. - Command line options …
... & 5 emulation for instructions SCF/CCF (thanks to Patrick Rak ...Unusual custom turbo loaders - with sourcesI have always been fascinated by turbo loaders; my games all feature a TZX version with one of such schemes implemented, and I have been experimentin…
... />
LD A,255
SCF
INC D
EX ...
OUT (254),A
SCF
RET
[/CODE]
LD A, 255
SCF
INC D
EX ...
OUT (254), A
SCF
RET
[/CODE]
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…
... /> xor a ; a=0
scf ; our shift bit
loop ...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: …
... execute a clean USR to "SCF + RET NC" or "RET". Fuse ...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.…
... /> AND A
RRA
SCF
RRA
AND A ... /> and a
rra
scf
rra
and a ...
