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Collision detection for interlocking shapes[SIZE=3][FONT=Calibri]I?m looking for some advice as I?m not sure how to resolve the following problem. I have an in memory structure that holds info…
... br /> [SIZE=3][FONT=Calibri]Screen Address[/FONT][/SIZE]
[SIZE=3 ... Calibri]32 ; Add 32 to the starting address (so directly below the ... of using the bounding rectangles to do some basic "fast" ... first thought was to create a list of attribute address for the ... -
FZX Driver for z88dkAn fzx library for z88dk can be downloaded [URL="https://drive.google.com/file/d/0B6XhJJ33xpOWM2hWNjAxMVkxaEk/edit?usp=sharing"]here[/URL]. The libr…
... to a new line when the right side of the screen ... of characters actually written to screen and the carry flag ... the bottom right of the screen.
[B] ... The intention is to allow you to specify how wide ... string will fit in a row. You can keep calling ... -
Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... command) to re-map itself to skim-read from an alternative address, so ... should re-map to intercept reads to the ROM address space, and treat ... . Better would be able to place its screen address at least on any ... -
Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... / jumps to address 0x66. The idea is to rewire these jumps to RAM so ... insert JP to our code at
(for example) address FFFD. The ... plan is to write C3 5B 33 instructions to the address FFFD.
to address 5cb2
0x1222 LD HL ... -
Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…
... data and address buses and writes directly to RAM, ... of the bus, written to screen memory, then released control ... />
* Memory to memory transfers
On the ... bits of the port address with each increment of ... and no ROM to be able to bootstrap itself ... -
z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
... /> ld a,21 ; row 21 = bottom of screen.
ld (xcoord),a ... 16 - this prints the space to screen effectively drawing over the asterics ... Why/what does this print to screen?
ld a,(ycoord) ??? doesn ... -
off screen bufferwhen using an offscreen buffer is the memory copied to the screen in a way that makes it easier to draw sprites to the buffer? E.g. Lets say you…
... to the screen in a way that makes it easier to draw sprites to ... of the screen where you copy your buffer to,
... the buffer was copied to the screen so that the first ... that its easier to draw sprites to the buffer, and ... buffer
copy buffer to screen -
what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... de,hl ;de now contains screen address hl contains array location
it is supposed to fill an 'array' with the ... right hand side of the screen,
the charaddress function works ... -
Work out screen address from attribute cellAttribute cell 22529 is equivalent to PRINT 0,1 position value. Is it possible to obtain these two values from the number 22529 in a simple MC rou…
Attribute cell 22529 is equivalent to PRINT 0,1 position value.
Is it possible to obtain these two values from the number 22529 in a simple MC routine? -
Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…
... br /> ; -7(ix) = i (row)
; 6(ix) & 7 ... a
; row loop counter
ld -7 ... ),a
; Row loop - do this 8 times ... (base ptr increments per row, copy runs with string ... we're full, flush byte to screen
ld c, #0x08< ... -
Trying to remember a platform gameI used to play a game with my dad that had a moon that was semi clouded over in the background. You would go from screen to screen collecting and ma…
I used to play a game with my ... background. You would go from screen to screen collecting and maybe shooting things ... search but I have nothing to search from this!
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 …
... FILE - add a custom loading screen. Screen must be in binary .scr ... /> |
| -b - force buffer storage to screen area (with corruption), useful if ... has an
| alternate loading screen and filename, menu & volume ...Fighting Warrior's protection systemThis is one of those bizarre cases where cracking the loading system is orders of magnitude more fun than playing the game. (Indeed, discovering I wa…
... variables, sets up ERR_SP to point to the BASIC calculator's workspace ... bytes off tape for a screen address, then 8 bytes for that ... the attribute. This allows the screen to be drawn in a non ... to jump to it. The copying routine takes the code hidden on screen ...Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…
... But the program seems to know that it's there ... logic, and I seem to get activity on A15 with ... 'm only getting .01 to .02 volts with a multimeter ... 85, 170, and 0 to that address, but PRINT PEEK returned 85 ... addresses above 23733 (from 23734 to 23740) and got 244, ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... routine that only calculates the screen address once.
With this ... this topic.
Thanks to everyone that contributed.
... - x range is 0 to 255, y0 range is 0 ... - x range is 0 to 255, y1 range is 0 ... INC b ; now 1 to 8
XOR A
Speccy machine code info where is it?Recently I've been trying to learn Z80 and I've managed to make limited progress (some of my routines even compile now!) but I seem to be having trou…
... mnemonics I use:
Screen Address (16 bits)
010B BSSS ... 0-23
Attribute Address (16 bits)
0101 10BB ... can figure this out, the screen display is easy to understand.Anyone for a hacking challenge ?I have to get the DSK version of Tomahawk to work. It uses the well-known Digital Integration "SECURITY CODE" lock just like in Bobsled, ATF, etc. Th…
... the program counter PC to start executing at 24000 ... tries to guess the code then jump to the address ... specified by HL which is likely to ... be a low value to ... % readability on the screen at the same time ...help with sprites from SevenUpHas anybody got source for a short m/c rountine that can send sprites designed in SevenUp to the screen or to a dummy screen? A long time ago, I wor…
... The way the Spectrum's screen layout is divided into ... be a little difficult to master at first. All ... you need to do is take your ... determine which third of the screen you're dealing with, ... add 64 to give the high byte of your screen address - 16384, ...FAST PIXEL DRAWINGI'm looking for the fastest way to put a pixel to the screen (on spectrum ofcoz:). Here is my own procedure (written in PASMO). But I don't how do it…
... strange since the intention was to make DRAM refresh easier (o ... />
But you just need to swap address bits from:
to get a linear video address space...
That's how I map my VGA screen ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... take it you are prepared to sacrifice some memory when ... /> Do all these calculations, including screen address at a non-speed-critical ... each line and jump to it according to the result of ... from left to right, then right to left, then left to right... changing ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... /> I have also been able to implement the reverse direction for ... , saving the need to store and retrieve the screen address each line.
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... LD DE,(SPRADR) ;taking precalculated screen address where to draw sprite
LD ... screen
INC DE ;increase screen address
INC H ;direct hl to point to ... DRAWE2 OR %00001111 ;to save and retrieve the screen address at
LD ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... /> Yes, good idea. I need to restructure the layout so that ... increments for sprites are next to their relevent positions (i.e ... you mean, only recalcluate the screen address when the sprite moves?
to see this optimised. Once the ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... DE,(SCRADR) ; taking precalculated screen address where to draw sprite
LD SP ... />
LD (SCRADR),HL ;store screen address for sprite drawing
* Routine to Generate a screen address table
* SCRTAB must ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... char to the screen
; On Entry:
; HL Contains Screen Address
; converts a screen address to an attribute address
; on entry: de = screen address
; on ...IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... HL
; converts a screen address to an attribute address
ld a ... /> ; converts a screen address to an attribute address
; on entry: de = screen address
; on ...An emulator(another on of my projects) Does anyone know how to write an emulator? The emulated computer is very simple (a MK14, infact -also by Sir Clive) and a…
... anyone in the SAM community to write a compiler :( Plus also ... br />
I could print to a backscreen, but am waiting ... , you mean like working out screen address for a pixel and setting ... />
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I want to join the club, do I ...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 …
...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H ... CHAR TO THE SCREEN
; ON ENTRY:
; HL CONTAINS SCREEN ADDRESS
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 …
...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H ... CHAR TO THE SCREEN
; ON ENTRY:
; HL CONTAINS SCREEN ADDRESS
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 …
...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H ... CHAR TO THE SCREEN
; ON ENTRY:
; HL CONTAINS SCREEN ADDRESS
