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Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
What is the fastest way, given x,y (in hl) to return the attribute address? -
bitmap address to attribute addressI've searched, but I don't seem to find the proper keywords. I have a bitmap screen address in DL, character aligned (the address of the top byte of…
... I have a bitmap screen address in DL, character aligned ... (the address of the top byte ... a quick way to get the corresponding attribute address fiddling with ... that bitmap address?
Calculating screen address to alternative ATTR area?I'm using this small snippet of code to convert a screen address to an attribute cell address... [CODE]AttrDE: ld a, d ; get the hig…
... of code to convert a screen address to an attribute cell address...
... attribute address
or 0x58 ; set the high order byte to ... /> ret ; de now contains the attribute address
[/CODE]
Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... (where n is 0 to 255). The co-ordinates are taken
; ... from the standard screen channel. To ... print at a specific co-ordiante use< ... br /> ex de, hl ; character attribute address to DE
; error ...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…
... ,bc
;calculate the correct Attribute Address for the Y\X values ... (hl),e
;set the Attribute address to the line below - and set ... the Attribute address - set the adjacent horizontal Attribute - then set the Attribute Address back
next pixelI searched the "Discussions" groups for the phrase "next pixel" and got no matches - and removing the quotes it discards the "next" and just searches…
... zx_saddrpup = screen address pixel up
zx_aaddr2saddr = attribute address to screen address
...
screen address = pixel display address 16384-22527
attribute address = attribute ...Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... highlight subroutine I need to set the attribute address to hl based on the ... /> [code]
highlight ; set the attribute address here to hl
ld ... (hl),%00000100 ; the attribute value that will ...Animated attribute revealA new challenge to solve next. I would like to create an animated attribute reveal in machine code by having my 768 byte attributes held in ram whic…
... to the screen is highlighted.
So, I set my attribute ... highlight subroutine I need to set the attribute address to hl based on the ... per Y row for me to refer to
[/QUOTE]< ... />
this subroutine counts koords to adr in atr place
Reading DEFB for backgroundsHi all I suppose the question is kind of silly but I'm a completely newbie with assembler :-S I'm drawing some side backgrounds with ZX Paintbrus…
... useful bits of code. Attribute address to screen address, and screen address to attribute address.
[code]aa2sa ...Work out attribute location in MCHow do I go about writing a MC routine which calculates the attribute address from a set of PRINT co-ordinates. I know you in basic you multiply the…
... which calculates the attribute address from a set of PRINT co-ordinates.
co-ord and add to 22528 to find the address.
Struggling to do it ...some debugger in emulators that is able to brakpoint when a mem address is accessed ?Is there a debugger (disassembler) available in some emulator that is able to stop (breakpoint) when a particular memory address is accessed ? For e…
... is able to stop (breakpoint) when a particular memory address is accessed ... example I want to stop when address #5aff is about to be changed ... this case a specific color attribute) and to see where the program ...Convert AT co-ordinates to PLOT co-ordinatesHow do you convert the 2 from MC? I don't know how to convert the vertical value as they're differently ordered... Heres what I have so far: [CODE]…
... ? I don't know how to convert the vertical value as ... a,(50000-3) ;vertical AT co-ord
ld b ...misunderstanding screen addressingHi I am just reading mastering machine code Toni Baker: [url]ftp://ftp.worldofspectrum.org/pub/sinclair/books/MasteringMachineCodeOnYourZXSpectrum…
... attribute byte”. For example,
consider the point whose PRINT AT co-ordinates ... are 5,4. According to
the ... diagram, the first two digits of the address ... 4. This gives us the address 40A4.[/QUOTE]
...New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... br /> -------------------
To prevent "Program: foo" or "Bytes ... print output is to be send to the printer. A ... mean it is to be sent to the TV screen ... /> Keeps track of the address on the machine stack where ... the same again to get back to normal L/C ...Getting attribute location from a screen coordinates (x,y)I am having trouble figuring out how to convert an x,y coordinate pair (pointing to a specific pixel) to the location of the attribute for the block …
... really.
Divide your co-ordinates by 8. You now have ... your result to the address of the start of the attribute data. You ... now have an address that points to the attribute square ...Getting attribute location from a screen coordinates (x,y)I am having trouble figuring out how to convert an x,y coordinate pair (pointing to a specific pixel) to the location of the attribute for the block …
... really.
Divide your co-ordinates by 8. You now have ... the attribute data. You now have an address that points to the attribute square ... you'll have to subtract the Y co-ordinate from 176 ... ever use the Sinclair BASIC co-ordinate convention for a ...Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... JR NZ,MEASURE_FAIL ; This address failed to hold a byte
... save the co-ordinates
; Write the attribute byte first< ... ADD HL,BC ; Add to base screen address
... LD BC,$1800 ; Add offset to start of ATTRIBUTE ...Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... I'm pleased to say that the latest attribute fix doesn't ... offset is added to the base
; address to give the correct location ... ; the X and Y co-ordinates and move to the
pop af ... />
inc e ; Timmy's attribute patch
ld a, e ...Work out attribute location in MCHow do I go about writing a MC routine which calculates the attribute address from a set of PRINT co-ordinates. I know you in basic you multiply the…
... which calculates the attribute address from a set of PRINT co-ordinates. I know ... co-ord by 32 add the horizontal co-ord and add to 22528 to ... find the address.[/QUOTE]
to hi byte (they become bits ...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…
... offset is added to the base
; address to give the correct location ... ; the X and Y co-ordinates and move to the
pop af ... />
inc e ; Timmy's attribute patch
ld a, e ...A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... it won't require extra attribute bytes, therefore even the ... pointers and X/Y character co-ordinates.[/QUOTE]
... called [B]BIFROST_drawBackTiles[/B] to redraw the background tiles behind ... bicolor attributes (or an address or index for each sequence ...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…
... to do is add a routine you can CALL to calculate the attribute ... screen address. This is the ... ,(tile_x) ; retrieve co-ordinates
call get_screen_attr ; returns HL containing attribute co-ordinates on screen ...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…
... ,(tile_x) ; retrieve co-ordinates
; call get_screen_location ; returns HL containing attribute co-ordinates on screen ... get that screen address to be converted to the address of the attrs
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.…
... I][SIZE="1"]because the attribute data is retrieved from a ... cycles. Needless to say that the C64 attribute layout is linear ... RAM and another one to read an attribute from screen RAM. ... it comes to bit- bashing pixel co-ordinates into a screen address though.Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... [url="http://www.peargames.co.uk/downloads/bb2.z80 ... /> ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
LD A,H
co.uk"]rob@pearmain.co.uk[/email]
co.uk"]www.peargames.co.uk[/url]
Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... :
[url="http://www.peargames.co.uk/downloads/bb10.z80"]http ... ://www.peargames.co.uk/downloads/bb10.z80[/url ... /> ;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H
What should be the base address to set for my codeHi, I am new here and I have a simple question but one which I have not found an answer to. When I am developming my programs what should I set th…
... have not found an answer to. When I am developming ... I set the base address for my code to (i.e. the ... area of the memory assigned to machine code can move ... fixed location that I can to give me as much ... start it at the highest address that it could possible be ...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 pointing at the screen address
ld de,scratchspace
address
ld de,overscratch
co-ordinates for printing routine x=0 to 40
ycoord defb 0 ; co-ordinates ...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 …
... /> [img]http://www.yellowspider.co.uk/speccy/jsw2.loadingpic.jpg ... br /> [img]http://www.yellowspider.co.uk/speccy/jsw2_keypad.jpg[/img ... br /> [img]http://www.yellowspider.co.uk/speccy/loader_jsw_sp.jpg[/img ... header to load the 'basic' at a higher address, and ...
