... unnecessarily cleared the unused printer buffer which contains the new system ... routines so will COPY the screen to a ZX Printer in ...

... display (for example the full screen scrolling text messages in Prehistorik ... you'd then have to buffer changes in some additional registers ... order to keep the on-screen colours available to the output ...

... you'd then have to buffer changes in some additional registers ... order to keep the on-screen colours available to the output ...

... data.
1. screen byte=left part of shifted ... byte.
2. screen byte=right part of shifted ... byte.
3. screen byte=right part of shifted ... />
This is one screen byte:

[code ... in an 8-byte buffer at address SP1V_PIXELBUFFER. Once ...

... doesn't do any actual screen rendering or you might find ... write your sprites to a buffer, precalculating bitmaps masks (if you ... read precalculated SRC and DEST buffer addresses etc.

Another ...

... size screen 32x24
53 ; d1ff - d1ff SP1.LIB attribute buffer
buffer
55 ; d1ed - d1f6 SP1 ...

... them to the screen or a 256-byte sound buffer, and stopping ... to dump something from that buffer to the AY) and there ...

... the entire buffer to be manipulated before being dumped to the screen.

... use a table for your screen addys rather than calculating them ...

gentable
;generate screen address table of beginning
ld hl, $ee03 ;buffer start
ld bc, $0020 ...

... pixel frame buffer, does allow you to update the screen a lot ...

... from back buffer to screen I use a 256 byte buffer with screen addresses ... to update (generated from dirty buffer). If ... cells to the screen, clears the end of buffer flag.

... . One is screen, and generally games uses a buffer to create image ...

... lesson box (bottom of screen) is now 'wide-screen' and is 14 ... was recovered as the lessonbox buffer is no longer required)

... to the bottom of the screen and renumber 9999. You can ... variables -

x across screen - set automatically by 9390 so ... but it uses the printer buffer as workspace so making this ...

... with the distance "into the screen" (the z coordinate) determining scale ... wider than the Spectrum's screen, with the origin being in ... your characters on your work screen, you divide the paper x ... find the position in your buffer screen, and plot the item there ...

... the bottom of the screen from a buffer, and scroll it upwards ... as it goes up the screen. It would have to be ...

... each 1/3 of the screen. That makes 159 lines, and ... the colour effects down the screen, then erases the sprites before ... functionality of having an attribute buffer, just at a lower resolution ... 's later stuff, where the screen and sprite redraw starts off ...

... br /> A000: Back buffer
B800: Back attribute buffer, has attributes for ... bottom 1/3rd of screen ... Final Barrier and (unused) title screen

F408: ... , game over
* Title screen
* Score / High score ...

... back buffer and blit to the screen at ... buffer as one large sprite and blit that to the screen ... means that updating the screen with stuff that's ... the non-contended back buffer, only hitting contended ... buffer, but a stack of 'tiles' which are blitted to the screen ...

... />
Oh, arrange the back buffer as a straight forward grid ... port) to the screen than your back buffer. Once the virtual port ... you're blitting to the screen ... reaches the edge of your back buffer, you need ...

... byte per character in your buffer screen.

This way ... move or redraw your buffer as it's less ... You then translate the buffer into real graphics as you ... it all over to the screen.

In fact ... to redraw the entire buffer each time from a ...

... want to scroll the screen, a back buffer or render the text ... ?
- What part of the screen are you going to scroll ... the top third of the screen, is that because you want ... "whatever is currently on the screen irrespective of how I put ...

... to scroll the screen, a back buffer or render the ... /> - What part of the screen are you going to scroll ... the top third of the screen, is that because you ... is currently on the screen irrespective of how I put ... top third of the screen where each char position ...

... byte per character in your buffer screen.[/QUOTE]
Absolutely. Great way ...

... the HIGH watermark of the buffer.

EDIT: I see ... (same, but ORs graphics to screen, bit of a late bodge ...

... ) 32 bytes into a small buffer (with a predictable upper limit ... screen, then shift any leftovers down to the bottom of the buffer ...

... ) 32 bytes into a small buffer (with a predictable upper limit ... screen, then shift any leftovers down to the bottom of the buffer ...

... ) 32 bytes into a small buffer (with a predictable upper limit ... screen, then shift any leftovers down to the bottom of the buffer ...

... . e.g. 32 bytes for screen data, 2-4 bytes for ... as you keep a rolling buffer that's at least one ...

... . e.g. 32 bytes for screen data, 2-4 bytes for ... as you keep a rolling buffer that's at least one ...