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Get rid of 'Bytes:' when loading codeHow do you hide the 'Bytes:' when loading code? I've tried saving as CHR$ 22 + CHR$ 6+ CHR$ 0 (a blank part of the loading screen) but it still appe…
... notes also mention you have to restore the original value with ... ROM.
Changing the low byte to 111 gives the address 2415 ... or 0x96F which corresponds to a RET instruction, hence the ... sure whether you'd need to put it back or not ... -
Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... . /M1 is sometimes included to "make sure"...[/QUOTE]
... you can wire /IORQ to one control input and A5 ... wire !IOREQ to one control pin, !RD to the other control ... ports, it is easier to use a 74LS138 which ... bits of the high byte to select one of eight ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... a seek by specifying byte and bit to start decoding from.< ... = next bit in de's byte to interpret (bit mask)
; ... inc de ; move on to next byte
ld c,$80
byte
and c ; mask off ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... B] writes a single literal byte to output. Change this so it ... state and simply return this byte instead.
[*] ... a single byte. Next invocation should check preserved state to see ... still need to access a byte that was extracted "up to 2176 ... -
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 …
...
inc l ;up one byte to birdship graphic loc
ENDR ...
inc l ;up one byte to birdship graphic loc
ENDR ...
inc l ;up one byte to birdship graphic loc
ENDR ...
inc l ;up one byte to birdship graphic loc
ENDR ... -
A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... to.
When you first open a file, the next byte ... read 6912 bytes the next byte to read will be 6912 (remember ... of 1400 bytes the next byte to read will be 8312 and ... 'll need to use DD_L_MOTOR_OFF (or an out to $1ffd) to switch it ... -
A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... to.
When you first open a file, the next byte ... 6912 bytes the next byte to read will be 6912 ... 1400 bytes the next byte to read will be 8312 ... need to use DD_L_MOTOR_OFF (or an out to $1ffd) to ... depacking the loading picture to continue reading from ... -
A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... to.
When you first open a file, the next byte ... read 6912 bytes the next byte to read will be 6912 ( ... of 1400 bytes the next byte to read will be 8312 ...
If you only want to read chunks of data one ... . If you really need to move it, you must ... -
A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... optimized
; Some things to remember about +3DOS:
; - ... , interrupts are ENABLED
; - To use +3DOS, you must put ... file pointer
; the next byte to read will be at 6912 ... /> ; so we'll need to move pointer to position 47562
quick RAM copy using LET in BASICI'm in the process of reviewing, revising and refining all the programming tips & utility routines which I've posted on this forum over the last eigh…
... /> 1- Load tape datamap to Address 60160 to 64440 byte block.
2 ... - Copy from 64440 (level 1) to ... 160 bytes and convert each byte to corresponding character data:
< ... for gain speed... only change byte info and a$ "tile" ...Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
...
What I tend to do is once I have ... the spot where I want to place a character, I ... then run this code to get the attr address.< ... d ; get the high byte of screen address
rra ... ; set the high order byte to the start of the attribute ...Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…
... is directly twiddling the speaker to implement the square wave generation ... bit samples into a byte, the time to unpack that into two ... authors may have chosen to use a whole byte to store a sample ... position (the force required to deflect the diaphragm is not ...Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…
... authors may have chosen to use a whole byte to store a sample ... .[/QUOTE]
How about pre-converting each byte ... /> Or perhaps the sample byte is used to index into a look ... and combine with a high byte to get the table address.
writing incrementally to tape without leadersI want to be able to write intermittently & incrementally to some sequential medium which is supported on any Spectrum (emulator, ie. tape); eg. [cod…
... with a byte, and have just that one byte output to tape, *and ... * emulators to output that byte to an emulated ... it writes a 128 byte data block to tape. (Completely untested)
Routine for handling large scores?[FONT=Calibri][SIZE=3]I want to store various numbers for scores and levels etc. Some of these can be very large so will need to be held in multiple …
... store scores as one byte per digit. It makes ... (e.g. 10) to signify an usused higher digit ... the bottom byte up, and accounting for carrying and to convert ... typically you only set one byte to set a score, e.g ... might need is a byte-by-byte comparison that can ...FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... that sends and receives a byte to and from fuse program would ... ^D is CTRL-D, to tell cat to stop processing lines of ... would be acceptable to be forced to wait for printing to complete before ... being able to do ...LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …
... isn't having to perform a write back to memory or ... the opcode signals whether to write to memory and increment DE ... byte to (DE), increment/decrement DE OR compare byte to A OR output byte to ... /> M3 input byte from (BC)
M4 store byte to (HL), increment ...FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... /> __endasm;
}
byte serial_read() __naked {
__asm
ld a,2(iy) /* a=byte to send */
rst 0x08
byte b) __naked {
70 ; ...Edge Connector InformationHi Everyone, Hope I'm posting in the correct forum. I've recently been playing with an Arduino and got to thinking it would be fab if I could do so…
... bus (8 bit = one byte), the memory or output device ... can remember the data byte that the CPU will ... to the latch chip, which then captures the data byte ... . Having got the data byte, the latch will remember ... CPU writes a different data byte to it. Not only this, ...Real Spectrum RamSoft colour issueHi, Using W7 Home thingy. I can set the prefs so Real Spectrum to full screen, but in full screen mode the colours are all wrong. Is it a Windows …
... there a way to fix the emulator to a full- ... settings from "Standard 1x" to "Pixel Scaler 2x" in video ... br /> If you want to do permanent changes you need ... to edit realspec.ini file.< ... I cant find a way to stretch rs window across ...Real Spectrum RamSoft colour issueHi, Using W7 Home thingy. I can set the prefs so Real Spectrum to full screen, but in full screen mode the colours are all wrong. Is it a Windows …
... FX settings from "Standard 1x" to "Pixel Scaler 2x" in video options ... (F11).
If you want to do permanent changes you need ... to edit realspec.ini file.
... /> I cant find a way to stretch rs window across the ...FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... br /> inc hl ; hl points to byte to send
;; ... /> ld d,(hl) ; byte to transfer to d
out (RS232_DTA ... sender to stop sending (every time you read a byte...)
{
byte b;
byte *vmem=(byte *)16384;
int ...Change PAPER and BORDER colours from machine codeHow do you go about changing PAPER and BORDER colours from machine code? I've forgotten the system variables for border and paper.
... if you use RRA (1-byte opcode) instead SRA A (2 ... -byte opcode):
[code]
LD ... ),A ; Change border color (send byte to ULA).
[/code]
Help with Assembly - DEFB, etc.Dear all, I'm going through Jnathan Cauldwell's tutorial and find myself scratching my head at part I can't find a decent explanation of anywhere! E…
[QUOTE=Ralf;789606]
But he apparently didn't want to count text length each time so he gets it by (TextEndAddress - TextStartAddress)[/QUOTE]
He also saved one Byte to terminate the string.Creating a linked list in Z80[FONT=Calibri][SIZE=3]I am using a circular buffer to store tiles to be displayed on the screen. Tiles only appear for a set period of time, so when …
... if 1 byte per element is just a flag to indicate if ... reduced to 4 bytes each![/I][/QUOTE]
The byte that ... longer bother printing it. This byte has a dual purpose. There ... data block may need to increase by another byte to 6 bytes as ...Pixel level collision detection[SIZE=3][FONT=Calibri]I need to do some pixel level collision detection. Assuming I have a byte of my ?player? sprite in DE and a byte of screen to t…
... there is an another solution to pixel perfect collisions.
As ... /> And why would anybody like to do them at all? Because ... not many players are going to complain about it, they would ...New Game(s): Sir Ababol 2 and Sir Ababol DXHere is our own Christmas Present from Mojonia! We weren't going to release these games (at least, by the moment) but we decided just yesterday to fi…
... ROM print routines just to be able to stand alone). If you ... , and I'm getting used to WASD :-)
[CODE] ... /> keystrings ;change as appropriate, rem to change the number of keys ... /> keyports ;stored as port then byte to mask
;e.g. in ...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…
... ld h,(ix+5) ; high byte of first arg
... ld e,(ix+12) ; low byte of second arg
... ld d,(ix+13) ; high byte of second arg
... need to set the address
;; to the highest byte to be ...Buddy 0.1 demo[url="http://wischner.co.uk/downloads/app.tap"]The tape is here[/url]. Load it, then enable kempston mouse emulation, then reload it. [url="https://g…
... happen when windows overlapping changes) to multiple smaller rectangles and then ... for this to be fast is to decompose graphical operation to just the ... how many bytes to skip after last byte to get to the next row ... line is copied we need to get to the end of scan ...
