... Sprites. Up to 32 per screen, but only 4 per scanline ... 8x8.
3. The video memory is in a separate address ... memory contention but stops you from directly writing graphics to the screen ... on fast writes to the screen memory for things like smooth scrolling ...

... than the size of the screen RAM, or any deficiencies ... case of the BBC Micro, screen memory was effectively uncontended. One ... to be slowed when accessing screen memory.

So in ... a CPLD ULA with uncontended screen memory, based on the Harlequin ...

... a 10K (mode 4) screen. The Spectrum is having ... (as it has more memory to play with). I ... if only for the extra memory, but also for the CMOS ... be faster, having no screen memory contention combined with the 6502 ... more efficient writing to memory and use of index ...

... PUSH them out again into screen memory) can only manage 16 characters ... if it wasn't for memory contention.

... model creates a buffer in memory that is a window peering ... Winston's ROM implementation to save on memory.

The other ...

... single instructions writing data to screen memory. It works this way: ... suddenly,after many instructions,all screen is refreshed.

screen memory [U]at the moment ... emulator, to watch changes to screen immediately?

...

... times per second, reading the screen memory [U]at the moment of ... ]

Not really. The screen memory is read a tiny bit ... emulator, to watch changes to screen immediately?[/QUOTE]

I ...

... to draw a full screen according to current screen memory regardless scanline timings ...

... opening .scr files to display screen memory after every assembler instruction.
memory for been seen as ... a game uses dummy screen and watching screen doesn't show game ... . Watching changes in dummy screen would explain much about drawing ...

But what use can I give in an emulator to a screen memory dump? Using the emulator as a picture viewer?

... /> I think that ideally, a memory tester should avoid all Z80 ... program relocates the stack onto screen memory at a 32-byte area ... a certain part of the screen as this program runs. (Historically ... or less trustworthy than the screen RAM that the program itself ...

... an emulator like SPIN to save screen-grabs out every frame, and ...

... to copy an entire screen stored somewhere to screen memory.

I ...

... to copy an entire screen stored somewhere to screen memory.

I ...

... updates only changing zones. Erase screen memory while running and see it ... game than jump and run "screen puzzle" game.

c ...

... to copy data to the screen memory - then you run into the ... memory contention issues, which means the ...

... gt; Complex Blender Fogger -> Screen Processor

A ... object previously rendered to the screen buffer.

... or blending with current screen pixel's colour value.< ... writing the pixel out to screen memory.


-----
...

... line other than how much memory you have free. However: ... efficient way of storing your screen than one pixel per byte ... messy low-level details (direct memory POKEing, binary representation, the internal ... file with a dump of screen memory, to be loaded with LOAD ...

... scenery in place in the screen memory, but only where there ... , then scrolled onto the screen. If you poke some ... also poke bytes onto the screen - if they change the ... into an empty area of screen, they won't.
... only copied to the screen where there isn't ...

... the raster' with copying the screen, that's complete hogwash. It ... d all be using full-screen rainbow generators in every game ... but you can rewrite whole screen without flickering.

... can fill about half of screen memory before beam reach the bottom ...

... but you can rewrite whole screen without flickering.

... can fill about half of screen memory before beam reach the bottom ... of screen.
Then beam is ... ]

correct: whole screen is probably imposible, just about ...

... way as the Spectrum screen memory is laid out. Store ... each line of the screen buffer to the display, ... fetching the screen address that each line ... could even make your screen buffer bigger, so you ... to read off the screen address straight into a ...

... way as the Spectrum screen memory is laid out. Store ... blocks that don't cross screen block (ie thirds) boundaries ... routine to find the screen address for the next ... code]
; Work out next screen line
NextPixelLine:
ld ...

... no need for it - and save more memory.

... to the Spectrum Screen layout, of course. The screen address could be ... same way as the Spectrum screen memory is laid out. Store it ... copy each line of the screen buffer to the display, fetching ... the screen address that each line has ...

... scroller. If you manipulate the screen redraw, you then have to ... at odd places in the screen memory, which can be more trouble ...

... the middle of the screen. The 9 characters to ... centre section of the screen is filled with a ... address of where the screen redraw takes its attribute ... to be drawn to the screen memory, but the attributes have ... a buffer elsewhere in the memory.

If ...

... synchronise themselves; any write to screen memory during the 128 T-States ...

... synchronise themselves; any write to screen memory during the 128 T-States ...

... updates only changing zones. Erase screen memory while running and see it ... the difference of the "selective screen update" approach between FairLight and ...