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How does the Speccy deal with the Character Set?Hi All, Can anyone spare a little time to explain to me the basic Assembly method of how the Speccy interprets and retrieves Characters to print on …
... Move the pattern byte to the screen address of the top row of ... with 1
Increase the screen address with 256
6 Repeat ... the simple calculating (related to character positions on screen).
Note that ... -
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 …
... in my screen address table. Then I POP DE to get a screen address from ... my table, copy from DE to HL to ... sprite, then POP DE to get the next screen address.
But ... -
Successor to the SpeccyBased on the rambling on the other thread it would be interesting to see what people felt was the 'spiritual' successor to the speccy. Amiga here....
...
You could write to the interleved screen data on an ST ... being able to manipulate the low-byte of the screen pointer ... out how to manipulate the start address of the screen ('synch scrolling ... if you could set the screen address per byte, you could ... -
Maze Mania - How did they do it?Hi, I was looking at the game "Maze Mania" by Hewson Consultants, written in 1989. The game can be downloaded from here [URL]http://www.worldofspec…
... source address and the destination screen address. The SP is pointed to this ... /> POP HL ; Get SOURCE address from our table
LDI ... 2 bytes are the screen destination, the next 2 ... /> 2. Copy Masked Sprites to BackBuffer
3. Copy BackBuffer To Screen -
Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... I want to go in in order to scroll the screen.
to the screen.
Assuming HL holds the address of the ... screen address, does anyone have an example of how to BLIT this to the screen ... -
Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... memory.
To draw the sprites, I would ... add the sprites, copy to screen and do all the logic ... br /> ; hl = Graphics address
; de = Screen address
org 08000h
to screen (top left)
call ... -
Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... screen buffer to the display, fetching the screen address that each line has to go to ... and use POP to read off the screen address straight into a register ... for each line. Just remember not to ... -
Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... and "inc h" to navigate a screen buffer :-P The ... "next char" address routine to find the screen address for the next ... information you have about the screen address you do have:
... be accomplished by adding $f920 to the screen address.
... -
Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... not keeping to the Spectrum Screen layout, of course. The screen address could be ... screen buffer to the display, fetching the screen address that each line has to go to ... and use POP to read off the screen address straight into a register ... -
Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…
... only writing the same attribute right across each line. ... do more, maybe up to 20 characters wide per ... use the 128K's screen-swapping to do twice as ... . You modify the hidden screen, then page it in ... able to do the full screen width with a unique attribute in ... -
Russian Translations...As i have once again been reminded (by the "Homebrew games" thread), there are some funky looking Russian games that I can't play due to not understa…
... English bitmap for the title screen:-
Original ... leeway above and below that address to move my code if ... ;Input paramters, DE=destination address on screen of first (top left) byte ...
; HL=Address of first ... -
I just picked up a free Atari 520stJust got a free 520ST, (no cables or leads) and a small box load of games. :? dunno what to do with it, but it was being thrown out, so I grabbed it…
... could do with the ST screen. The simplest (but fairly ... by shifting the screen pointer (but it had to be on a ... with the screen timing to effectively get the screen pointer down to byte-resolution ... gaga trying to read from an odd address since the screen data is ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... redundantly to attribute addresses (so each 8 vertical pixels map to the same attribute address ... ) we map each pixel address uniquely to a ... adding a constant offset to the pixel address. This was what was ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... and it's lame address decoding, the upper byte ... we have those address lines fed to the ULA raw. ... Changing the low byte address to be 3A instead of 3B ... In which case, the address decoding can be much much ... what needs to be done. For every attribute byte loaded, ... -
Sprites...What is fastest way for drawing masked sprites at any screen position without using preshifted data ? I want to use it for isometric view game... li…
... the MSB of the table address and you load L ... the screen byte to the right). DE is the address of ... and IX is the address of the sprite data ... an 8-byte buffer at address SP1V_PIXELBUFFER. Once the char ... there, it is copied to the screen. There are no flicker ... -
POKING graphicsI remember using binary code (in BASIC) to POKE graphics (thanks Input magazine!) Using a FOR..NEXT loop you would POKE each square in the 8X8 charac…
... t widely known about. To use it effectively you had ... the characters you wanted to. It was all a ... you could use the SCREEN$ command to identify one of your ... it would be quicker to use specific colours for ... ATTR or PEEK the attribute to identify what was at ... -
Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... you a bit to use a table for your screen addys rather ... br />
gentable
;generate screen address table of beginning
;of ... pointer
ld sp, $d0f0 ;address table
ld hl, $ee03 ... br /> adc hl, bc ;move to start of next row
reimport of exported asm in 7upI know it may seem a cryptic title but is there a way of importing an asm file ( created using the export data option within 7up) back into 7up or an…
... The assembly output is supposed to output something that can ... sounds like your going to have to write a small ... going to have to write a program to reconstruct the graphics to screen, and ... your first line some arbitary address to start with, something like ...Character scrollingOk, first I'd like to say that I'm not looking for a complete routine (but that might help) because I am hoping to write it myself and learn a bit mo…
... uses LDIR, uses pre-calculated screen cell offsets table.
... 2 tables of pointers of screen cell rows.
; ... ; Char Down
; Adjusts screen address HL to move eight pixels down on ... .
; enter: HL = valid screen address
; exit : HL = moves ...New member here. And a spider! :)Hello everyone. My name is Sekrets. I'm quite a lonely individual, searching for a digital home where I might find fellow speccy enthusiasts to adopt…
... might find fellow speccy enthusiasts to adopt as family.
[/quote ... move a spider around the screen! but once my knowledge of ... out the hard part (drawing to screen, animation, etc) so you're ... 'll want to use a look up table for screen address mapping, but ...My first platformerHi all! How do you do? Been lurking here for a while, but never had the courage to join the forum. :) The Speccy was my first computer, so I've alw…
... allows their locations to be stored with the screen draw data via ... drawn -- ie it initializes the 'screen' member of the struct_sp1_updates).
to determine which preshifted sprite frame to use and add that absolute address to ...Double Dragon 128k - The graphicsAs you are all probably aware, I tried gathering a team of people together a few years back to make a totally re-programmed version of Double Dragon …
... and masks (it is possible to do in Sevenup) allows quick ... />
;HL - screen address, SP (stack) - sprite data address
[code ...
LD (HL),A ;write to screen
[/code]
In ...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 …
... notice that the subroutine to work out the Screen Address is called for ... : call p_at ;convert Character Position to Screen Address
ld b,8 ;transfer ... Bytes to transfer, DE Screen Address,
inc l ;HL=address of data to be ...Making Horace play fair!Hi again Has anyone created a new or twiddled version of Hungry Horace that has a more fair screen 3 and 4? Or a version of the spiders where the f…
... chances on being able to change the screen colours?[/QUOTE]
...
yes but hh acts according to attribute ... I included some hacks to change flower and horace's ... disasembly you need to manually poke values to the ram (colour ...Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... and X pixel values to the correct Screen Address - Address in DE
ld ... ,p_print4
;Increment the Screen Address and check to see if it's ... subroutine routine to convert pixel values into an absolute screen address
;On ...The Hisoft BASIC v1.2 Plus 3I am trying to compile a basic program with the [B]Hisoft BASIC v1.2 Plus 3[/B]. When i read the instructions to prepare the program to be compiled b…
... at the top of the screen. We have supplied a number ... of the screen. You'll have to press a key to continue (don ... colours will appear on the screen. We'll explain later what ... the LOAD line is the address to be used after RANDOMIZE USR ...'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…
There are many ways to print the strings and characters, ... programs it is not usual to use ROM routines, they are ... can't even recall how to change print position without using ... string
;input: HL=screen address, DE=string address
printStr
How to insert special characters in Basic and ASM ?Look the next picture. [IMG]http://img25.imageshack.us/img25/9479/scode.jpg[/IMG] I dont know how to insert these black and diagonal characters. No…
... the diagonal character in given address (similar to BASIC program from #13 ... />
[code] ld hl,address ;where to put the character
ld ... same code to draw the char on screen. Use some screen address, like #4000 ...Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... at the code, and got to:
push ... , it is of course equivalent to:
PUSH ... them have similar shorter alternates to some mnemonics
;save off Counter, Address of Character Data, Screen Address, Screen Address[/I]
...Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... and X pixel values to the correct Screen Address - Address in DE
ld ... ,p_print4
;Increment the Screen Address and check to see if it's ... subroutine routine to convert pixel values into an absolute screen address
;On ...
