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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 -
Developing ZX Spectrum using 8 chipsHello. Sorry, my english is not perfect. I am developing new realising of ZX Spectrum. There are 8 chips in my sch. Central processor and video proce…
... You also must remember in his design he's using ... . It executes most instructions in a single cycle, so ... you write your code in a way to avoid ... I've only programmed it in C). If you're basing your ... execute an instruction than the classic Z80, but even in the ... -
Help! Reverse engineering a Spectrum game[deleted]
... . CCowley obviously has more experience in stuff like this so go ... if you're really interested in them (and they are interesting ... and in some cases hugely complicated), if ... usually be the first m/c instruction of the game), or MERGE ... -
Assembly Programming for IDIOTSOk are there any websites guides for what opcodes do in a z80 or books... but for really really thick people like me :-) Something along the lines …
... together, but each isolated m/c instruction is simplicity itself. Same ... five or six hundred instructions in Spectrum machine code, and ... many of those are in similar groups anyway, which makes ... the same thing (at least in practise for people); assembler ... -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... irelevant when worrying about instruction data sizes on the ... memory fetch. The entire instruction decode process is cache based ... to decode the complex x86 instruction set. Why repeat the ... registry etc. is usually written in 'C' but everything specific to ... -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... are stuck with the x86 instruction set unless we want to ... programmers and mostly the drive in business for profit. Fair ... :) Space exploration was not pioneered in 'C++' or 'Java'... no wonder everything ... , those files are stored in some wacko format and don ... -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... something pretty tight). Writing something in C, Java, Perl or whatever ... write something smaller and faster in C. Why? Because it will ... Spectrum twitter client demo in C, not in asm. Why? Because ... the ugliness of an instruction set architecture takes up some ... -
SPRINTER 2000 and kempston joystickInfo about connection kempston joystick connector on Sprinter 2000 are corrected. My previous documentation contain bugs. Here is all OK (tested on r…
... B] ( [B]all insctructions IN X,(C) will read value 0 if ... port value to 15. Only instruction IN ?,(C) can't be translated ... games will not work (in game is used instruction IN ?,(C) for read joy ... adress 15 or replace instruction IN A,(C) with IN A,(31).
... -
This might be something new[img]http://www.711chan.org/test/src/130427925559.png[/img] Have a look at this screenshot of my emulator ZX82. Notice the copyright message? That's…
... this will (eventually!) be implemented in C on the host computer.[/quote ... SpecBAS will run programs written in Sinclair BASIC, but there's ... could use a double-byte instruction to say OpenGL stuff ... that. Implementing X80 support in an emulator would also be ... -
binutils questionSince there's a few people using binutils these days I thought I'd give it a go and see whether it solves my hunt for a replacement assembler/librari…
... in a C program aimed at the z80 which has no multiply instruction ... or scaled indexing address mode. It is inefficient in code ... , multidimensional arrays are relatively uncommon in C) of an array of pointers ... -
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…
... /> ld a, SKIP_RLC - END_LOOP ; instruction DJNZ skipping rotation
jr ... /> ld a, INIT_RLC - END_LOOP ; instruction DJNZ using rotation
NOT_RLC ... half of the font byte in C
ld a, (de) ; ... -
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…
... /> ld a, SKIP_RLC - END_LOOP ; instruction DJNZ skipping rotation
jr ... /> ld a, INIT_RLC - END_LOOP ; instruction DJNZ using rotation
NOT_RLC ... half of the font byte in C
ld a, (de) ; ... -
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…
... /> ld a, SKIP_RLC - END_LOOP ; instruction DJNZ skipping rotation
jr ... /> ld a, INIT_RLC - END_LOOP ; instruction DJNZ using rotation
NOT_RLC ... half of the font byte in C
ld a, (de) ; ... -
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…
... ld a, SKIP_RLC-END_LOOP+256 ; instruction DJNZ skipping rotation
jr ... ld a, INIT_RLC-END_LOOP+256 ; instruction DJNZ using rotation
NOT_RLC ... half of the font byte in C
ld a, (de) ; ... -
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…
... ld a, 256-(END_LOOP-SKIP_RLC) ; instruction DJNZ skipping rotation
jr ... ld a, 256-(END_LOOP-INIT_RLC) ; instruction DJNZ using rotation
NOT_RLC ... half of the font byte in C
ld a, (de) ; ... -
Questions about SEUDI recently purchased SEUD (Shoot-em-up Designer, for those who do not know it) from Cronosoft and tried to familiarize with it, also by peering into …
... , if you poke in an instruction at 48915 to jump ... my inability to program in M/C. I hope you ... Can redefinable keys be implemented in SEUD the way they are ... Kempston joystick support, like in AGD?
[*]Is ... -of-game variable, like in AGD?
[*]Where ... -
maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …
... would be enough. Any IN/OUT instruction can handle this, and ... you have to sacrifize C to hold the port address ... size of those registers, instruction format (which directly or indirectly ... hundreds of megabytes of information in memory (video, audio, still ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... assigned to, depending upon the IN/OUT instruction being executed. That is ... for OUT (nn),A and IN A,(nn) instructions, or bits ... of register B for IN r,(C) / OUT (C),r / INI / INIR / OUTI ... -
Circumspect - A Spectrum Emulator for learningThis is a project that I have been playing around with for a while. It must be said, I tend to have problems getting things finished where hobbies a…
... been written in C, since it produces just-in-time compiled ... decoded once, I performed instruction decoding with a hierarchy of ... cheat massively. I added instruction execution tracing to Fuse, ... full register dump for each instruction executed, and used this ... -
Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…
... would love to see improvements in the compiler/optimiser (specifically ... is implemented using the cpir instruction. I'd be hard-pressed ... and sdcc's are written in C. z88dk's has the special ... a couple orders of magnitude in difference of performance between ... -
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…
... /> I do software development in C# and SQL for my day ... accustomed to being experienced in one's field.
in order:
... required by every single instruction executed. This is ... of using pilot pulses in the data stream ... -
Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
... NZ,?? after the BIT 4,C instruction?
This is ... slow, but it is written in a way that I can ... B,16
fhdattribloop2 LD C,(HL)
LD A,( ... HL),A
LD A,C
LD (DE),A
The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…
... an assembler adopted for the C compiler portion of sdcc so ... an (ix+d)-type syntax in their instruction sets.
As ... ,
1001 B1 ora c ;If (B or C) = 0,
1002 ... 80s, a time when the C standard had taken hold a ...The Pros and Cons of "alternative" assembler syntaxContinuing from [URL]http://www.worldofspectrum.org/forums/showpost.php?p=720754&postcount=72[/URL] [QUOTE=u6c87;720754]But that wouldn't change if…
... and I have things like instruction timing memorized so I can ... the compiler with the latest C standard in terms of language compliance ... What it has is written in C and only very few routines ... -assembler :- the assemblers used in sdcc, z88dk and gnu binutils ...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…
... int_fetch ; get sign in C and number in DE
pop ... x80_fsgn_2:
ld c, a ; store it in C
call int_store ... /> inc a ; counter next instruction
org 0x3521 ... HL
ld c, a ; store value in c
ld a ...Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…
... carry flag and some instruction to decimal adjust after ... for that (and will be in C).
EDIT: ... does have the DAA instruction to correct an addition ... or get a bignum library in C or C++ ;)
... there is also an instruction to roll or shift ...Self modifying code ??I made a game in C that was mostly accessing arrays and using FOR NEXT loops, I ran out of memory, so I was thinking would it be possible to use sel…
... can write self modifying code in C by casting an array filled ... that with modern CPUs since instruction data is cached and not ...SkoolKit 4.4<div><font face="Arial, Verdana"><span style="font-size: 13.3333330154419px; line-height: normal;">Hey, first SkoolKit release announcement since the…
To render a numeric value in an instruction operand as a character, ... anywhere in a specific base, attach a b (binary), c (character ... sublength parameter on the B, C, S, T or W directive ... For example:C 30000,b
C 30002,c
will result in something ...Cap'n Rescue One Version 3.0Hi, just wanted to let everyone know that I've updated my ZX Spectrum platformer Cap'n Rescue to bring it in line with the graphical style of the…
... with AGD, and game editors in general.
... . I went on a 'C' programming apprenticeship for 2 years ... Jet Set Willy template in my instruction manual. Maybe I shouldn ... people - perfectly capable of programming in high level languages - refer ...Emulator developmentHi, Could anyone explain or direct to a link that explains in not to technical terms how an emulator is developed. It has always blown my mind eve…
... to write in C or whatever language every possible z80 instruction, and how ...
