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Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…
... (mistery?) behind ULA's spectrum screen memory interpretation?
... to draw something on screen you have to poke ... behind this implementation? Why screen memory isn't interpreted continuously? ... draw something on screen avoiding 3 block structure? -
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…
... were copying graphics directly to screen memory starting at 16384. Now I ... 'm experimenting with screen buffer where I could draw ... 's ready I would copy it to screen memory.
You may ... static image from buffer to screen after HALT.
... -
ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…
... offset that covers the Spectrum Screen Memory (6912bytes so only 13bits needed ... things off
(*store_l++)=*buffer_ss; // copy first literal into literal store ... /> ;; now calculate the memory position to start the copy
push hl ... -
Idea about improving EmulatorHi, I got a bright idea today how to improve such excellent emulators a bit more. Okay, disassemblers are available in nearly every one new released …
... sprites, chunks, painting on second screen, memory copy and bit-test, or HiSoft ... fact, a PC has enough memory and power to optimize the ... code for speed or memory usage, so the compiled code ... -
Memory usageBrowsing the online documentation for the Spectrum I came across a peculiar discrepency. As we all know the start of the RAM is at 16384 which is whe…
... which is where the screen memory resides. The screen memory ends at 23296. After ... is what on earth the memory before KSTATE and after the ... video memory is used for on a ... -
Does Screen Flipping work on a 48k Spectrum?On the other post it showed some basic code to flip the screen on a +3. Does it work on a 48k Spectrum. Can anyone show me the machine code to: Se…
... basic code to flip the screen on a +3.
Set the screen memory to default 16384
Write ... backbuffer 49152
Flip the screen memory to 49152
Many ... -
Sceen$ helpMost people have used screen$ at some time or another and for me what I want to do is use it or something like it as a start screen before the game p…
... like it as a start screen before the game proper.
screen$ then coping that into a safe separate part of memory ... display the start screen I can then copy this memory block back to ... the place where Screen$ is ... -
Watching screen while debugging???I'll try to state my problem clearly, but I don't know if I'll succeed ..:) I load a Spectrum program into emulator (it doesn't matter which one at …
... 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?
... -
How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…
... fourth?) Z80 shared our contended memory, then we could "easily" ... program onto CPU1 to copy the screen memory, and voila, we ... write multiple values in adjacent memory locations, by having CPU1 ... we replace the existing memory with faster memory, would we then ... -
Erase part of memory in SPIN?A question for SPIN (or perhaps Spectaculator). If I have a game loaded in memory and would like to erase part of the memory while keeping the rest …
... have a game loaded in memory and would like to erase ... part of the memory while keeping the rest of ... would like to erase the screen memory and watch what will happen ... -
Strange DivIDE ScreenI've just got an SD card adaptor for my DivIDE and it does something strange. On startup, I can see the DivIDE logo and it registers the adaptor, bu…
... normally empty areas of the screen are covered in an odd ... from the bytes in the screen memory. I can load a .TAP ... bit of corruption to the screen.
I actually got ... -
Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... x coordinate and the screen memory address I'm ... 256 = 16384 = start of screen display.
ld d,a ... ; squares 0 - 31 across screen.
add a,e ... e,a ; de = address of screen.
ret
Repton ManiaHi all, I am the creator, and look after, the Repton Resource Page ([url]www.reptonresourcepage.co.uk[/url]). For the site, I have written a freely …
... an original +3 disc copy of Repton Mania. The ... 0x9642 Lookup table into the screen memory (0x4000 to 0x57FF & ... /> 0x0A7B6 Lookup table into the screen memory
0x0A826 0xD60A Passwords - ... 0x896C Lookup table into the screen memory (0x4000 to 0x57FF & ...Double Buffer UtilityHi Folks, I've been experimenting with double buffering on a 48k Speccy for a small project I'm working on. After reading lots of good advice here…
... far left of the screen)
#
#Copy to screen y-position in ... /> self.destXPos = self.inputValue('Copy to screen x-position in (integer) characters ... - Push the registers to populate screen memory
numRegs = min(numRegs,8 ...Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…
... :
When clearing the screen buffer, it was actually much ... to the end of the screen memory area and push zero values ... onto the stack until the screen area was filled.
memory. I think this worked because ...Where does the BASIC program sit 48K Spectrum memory?Hi there First post so be gentle, I've had a spectrum since the 80's and have recently started programming it for fun again. I wrote the followin…
... POKE command directly to the screen memory.
5 LET a ... part of memory first then dump it to the screen quickly? Where ...is there a way of reading characters off the screen and turning that into a string? this has to be done in basic. i know it would have something to do with peeking memory (maybe screen memory) but would this change due to programs r…
... something to do with peeking memory (maybe screen memory) but would this change ... due to programs running in the memory ... ? i also need it to carry on reading the screen ...[Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…
... />
; Clear attributes memory.
ld a,FLASH_OFF | ... br />
; Clear screen memory.
ld a,%00000000 ; ... Move back to the previous screen address.
djnz cls_screen_loop ... using push/pop to copy memory fully unrolled with ...PAW questionThis may not be the right place but anyways there it goes: I've been trying to figure out how to import graphic files in .SCR format in the PAW parse…
... to the start of the screen memory
LD BC,2048* ... /> LDIR ; now we load the screen memory with the information at HL ... block of memory and then copy this data into the screen area.
screen memory is organised using these chunks ...Memory usageBrowsing the online documentation for the Spectrum I came across a peculiar discrepency. As we all know the start of the RAM is at 16384 which is whe…
... in that mode.
The COPY command doesn't use the ... at the end of the COPY command.
Since not ... variables will slide about in memory when you print.
screen memory at 23296.
A ...TAP files for the TS 2068Hi, just recently bought a TS 2068 and found "Taper" on the web. Downloaded it and began to use it only to discover that it would not open TS 2068 fi…
... whole screen). There was also a built in bank selection memory ... BASIC up above the two screen memory locations. All code to handle ... the cassette routines and to copy the function dispatcher to RAM ... for variables. The OS would copy a single line of code ...Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…
... store the whole screen in memory and ldir the whole screen memory - all you ... graphics behind the sprite in memory)
Create a special ... size as the background
Copy the background to the offscreen ... on the correct place on screen
When the ...The Key - version 5I used to use this to copy games (back up my own tapes, naturally!) when I first got my Spectrum in '83. Latterly used v7 which is in the archive, bu…
... 't have the screen and the code runs in screen memory. It's ... later because by running in screen RAM it can fill all ... tape code, so it can copy bigger files
[ This ...Graphics in Basic??What is the fastest way to draw high rez graphics in Basic. Andrew.
... UDG is PRINTed to the screen, it isn't updated as ... to the appropriate place in screen memory. You can then alter the ... ]
It will just copy and paste directly to BASin ...Ways to use double buffering in basicI was meddling with woody's print stream code where you can print characters at any pixel location on screen. I was playing with 12 sprites, very ann…
... post. This one *will* copy across memory banks and honour the bank ... a screen$ and then copy it to the 128's extra memory (you ... use it to copy from that extra memory back to screen$. As the ...Aggravating problem with screensI've rewritten my Sam C runtime emulator code ( well almost ) to allow me to use my own routines for blitting sprites onto the screen, storing tiles …
... for example ) and any copy of memory allocated for sprite data is ... transfers to the target screen by whatever bastardised mechanism ... into memory when blitting the active routines onto whatever screen is ... the best compromise between screen write speed and game ...It's fitting...... that in the very month that the 25th anniversary of the Speccy falls on, I'm just finishing up making my first ever Spectrum peripheral. It's a …
... wisdom of testing Spectrum memory. But it will include ... check for things like adjacent memory cells being affected (adjacent ... set OK, colour attributes, screen memory changes show up correctly, output ... br />
Then finally copy a ROM checksum program to ...Sceen$ helpMost people have used screen$ at some time or another and for me what I want to do is use it or something like it as a start screen before the game p…
... display the start screen I can then copy this memory block back to ... the place where Screen$ is ... up now the copy goes from the screen to memory. You can poke ...Sceen$ helpMost people have used screen$ at some time or another and for me what I want to do is use it or something like it as a start screen before the game p…
... , study:
To copy SCREEN$ to memory address 32768
LD ... BC 6912 ; length of screen ... /> LD HL 16384 ; Start of screen area
LDIR ; do the ... /> LD BC 6912 ; length of screen area is 6912 bytes long ...Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?
... of just contains some extra memory to do its stuff ... 16K at any one time (copy program into RAM, call it ... return pages the Microdriver's memory back in and restores ... read from a non-existent memory chip, you'll get ... and the stack overwrites the screen memory).
