-
HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…
... like "DEC PC", setting the program counter to its previous value so ... -
HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…
... this correctly, and the wrong Program Counter (PC - 1, specifically) must be ... -
The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…
... from which the command came (program counter address is payload of the ... .
Once the program would be loaded to ZX ... giving starting address of loaded program as address. The monitor ... that address. And the program would execute until it reached ... -
More basic assembly stuff!I've been figuring out some more stuff using CALL and DEFB but this has me a bit stumped. [code] ORG 33000 LD BC, 16384 PUSH BC CALL GO RET …
... ’s what happens in your program after you load BC with ... . Then it loads the PC (program counter) with the address of the ... . This instruction loads the PC (program counter) with the value from the ... that address, thus launching your program into the not-so-great ... -
Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…
... push the contents of the program counter onto the stack, and jump ... -
Speedlock Source CodeOooh - found some interesting Amstrad/Spectrum Speedlock source code over at [url]http://web.archive.org/web/20070126232648/http://andercheran.aiind.…
... a built-in Transfer Utility program, which has
a comprehensive ... menu, and then adjusting the program counter to $e092:
https ... not sure if altering the program counter to $e092 is sufficient for ... -
shadow regs musingIn the process of optimising some assembler, it occurred to me how great it would have been if the Z80's shadow reg opcodes had been a bit more fully…
... of register files including the program counter. But it was too complicated ... -
ripping music out of a machine code demoi want to rip the first track out of this demo. unfortunately i dont know how its called. ive tried randomize usr to various locations but it either …
[quote="digital;943488"]whats the pc?[/quote]
Personal Computer
Police Constable
Politically Correct
Program counter (cpu) -
How are LAST-K and FLAGS set on a Real Spectrum?Hi, I'm writing a Spectrum emulator and I've got Horace and the Spiders working (with the wrong colours and no sound) but when I boot into ROM non…
... Z80 responds by pushing the program counter onto the stack and jumping ... -
New Utility to Transfer Z80 Snapshot to +3 DiskSince getting a Gotek for my +3 it has been my go to machine. The biggest downside however is the lack of older games on disk format with pretty much…
... area)
3: @23296-23552 program will scan for continuous block ... buffer, if no space exists program will error
4 : @16384 ... banks.
Checks stack and program counter and if in upper mem ... -
How to write a simple BASIC* horizontal scrolling game (Tutorial) [b]How to write a simple BASIC* horizontal scrolling game[/b] In this tutorial, we will be talking about how to write a simple BASIC* horizont…
The Program Counter has already been incremented past ... -
Last Problem in Chapter 3 of Toni Baker's Mastering Machine Code on your ZX Spectrum.Chapter 3 of this great book is all about how to use the registers and covers the operations LD, ADD, ADC, SUB, SBC, INC, DEC, SCF and CCF. The la…
... what is happening in your program more than you can imagine ... values of the registers, stack, program counter, etc. will change before you ... -
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…
... in the value of the program counter. But it will not harm ... . Just because BASIC or a program may be waiting for user ... instructions, but with HALT, the program counter is adjusted to point to ... -
New Utility Z80onMDR - Transfer Z80 snapshot to Microdrive CartridgesWith the growing popularity of the excellent vDrive [url]https://vdrivezx.com/vdrivezx/[/url] I've adapted one of my utilities to create Microdrive …
... had stack in screen and program counter in stack among other interesting ... -
Graphic equalizer m.c. program neededBack in the 90's I had a full-screen attribute equalizer that was simple, yet very impressive. We used to listen to Vangelis or Jean M Jarre by conne…
... help me recreate this fine program.
English:
< ... value of each of the counter is different from zero, ... decrement that counter by one. This way all ... we can use an additional counter to perform this operation several ... -
FRAMES counter...Hi Folks, I wrote a test program that uses FRAMES to generate a clock. When I tested this within BASin it worked well and kept near perfect time. …
... />
I wrote a test program that uses FRAMES to generate ... code in my main program the FRAMES counter seems to be losing ... ?
For example, does program size make a difference? What ... -
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 is referenced while a program is running (not the ... analysis anyway SFAICS. (The program in question has 1531 statements ... ; otherwise, update the relevant counter and RES 1,(FLAGX). Either ... RET to continue with the program.
...
How to move the location counter backward with GNU binutils?I've converted a 8000-line assembler source from Pasmo to GNU binutils. It was not difficult. It's the first time I use GNU binutils. In my code t…
... I just saved the location counter into a local symbol, moved ... scenario, I could write a program to extract the value of ...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…
... I started writing a BASIC program for making and recording AY ... help me fix the BASIC program, I'd be very ... are on screen when the program is run, 'i' records, ... REM Untitled AY MUSIC Making Program
2 REM by ... INK 1;AT 1,21;"PROGRAM BY"
750 PRINT ...How do i learn to programAll the years i had a computer the only one i could program was the Texas Instruments Ti99/4a and when using extended basic with its so simple sprite…
... the only one i could program was the Texas Instruments Ti99 ... love to be able to program my own frogger game still ... for me to learn to program,i will be using realspectrum ...Run BASIC program by R. USR xxxxxGuys, please help. Suppose I have BASIC program in my Spectrum 48K starting with line 10. I'd like to start it by RANDOMIZE USR xxxxx. Which paramete…
... help. Suppose I have BASIC program in my Spectrum 48K starting ... BASIC interpreter to process my program.
Rgds,
-D ...Program pitstopDo you remember the program pitstop parts in Your sinclar magazine. I would like to type them up as PD Roms. Send any type ins from the mags as txt o…
Do you remember the program pitstop parts in Your sinclar magazine. I would like to type them up as PD Roms. Send any type ins from the mags as txt or scaned images.Bug on Cronosoft's Dead or AliveI can't believe this wasn't spotted before... I was recently puzzled to read a couple of reports of a bug on Cronosoft's Dead or Alive and as the pr…
... . It appears the BASIC loader program had an OVER 1 statement ... causes the score and lives counter to be displayed incorrectly during ... by altering the BASIC loader program and either placing an OVER ...First Y2K bug found in a spectrum program ?I've just been making some tzx files and I always test the file when its finished. So I loaded up Micro Fitness by VO2 software which is a fitness ut…
... which is a fitness utility program. First it asks you for ... and can't use the program !!! Trust me I wish I ...Program that looked like ceefaxOkay... Got a bit of a poser for you here as this is doing my head in bigtime. There was a program that looked and functioned like Ceefax, for the l…
... .
There was a program that looked and functioned like ... break and there was the program.
For my everlasting ... of the routines from this program for my GCSE computer studies ... .. does anyone know what this program is because I'd love ...Getting basic program listings into a text fileHi - can anyone tell me if there is an easy way of getting basic program listings out of an (any) Spectrum emulator and into a text file on your PC? …
... easy way of getting basic program listings out of an (any ...
