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128k programmingOk, I have had the normal man look (ie. not really), I want a good resource for 128k asm programming. Mostly just to find out how the RAM bank switc…
what advantage is there in using the shadow screen?
you still have to write bytes to both screens to erase them dont you? (which takes up valuable processor T-States) -
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…
... also looking at your variable delay loop to synchronize the raster ... models); I have an exact T state delay loop (by Jan B ... you tell me the T state delay you are using for 48 ... -
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…
... looking at your variable delay loop to synchronize the ... I have an exact T state delay loop (by Jan ... tell me the T state delay you are using ... br />
The delay between comment "synchronize with the ... />
I don't recommend modifying anything after label ... -
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…
... to z88dk, but I don't think it looks impressive enough ... />
You have about 20K T-states available per frame. That's ... -
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…
... happens. But if you don't have A' tied up you ... operations. Its just those 8 t-states they eat up, maybe a ... -
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…
... operations. Its just those 8 t-states they eat up, maybe a ... -
idea: new gaming interface for ZX Spectrum (48k)First of all, I am not an expert this is just an idea of what I would like to see happening in the modern era of the ZX Spectrum. A compact, small, …
... Arduino Nano (although don't quote me on that, ... bus) is 2.5 Z80 T-states. The Arduino Nano running ... will therefore have 11 AVR T-states to respond to the ... it'll take 7 AVR T-states to begin executing your ... leaving you only 5 AVR T-states to get the data you ... -
SWIV digitised speech as easter egg?I read in the permission from one of the authors of the game that the game had a "easter egg" with a speech from Aliens. I have never tried it myself…
... a second, or every 437 T states. 1K of memory (1024 bytes ... -
Cross platform developmentI'm just vaguely considering supporting a few more retro 8 bit platforms for something I have in mind to do. Just Z80 and 6502 really, but that cove…
... page + index register is 4 T-states). You might not be able ... ).
What it doesn't have is register pairing and ... -
bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …
... bytes, run time about 400 t-states. Of course, I would love ... E ;E=uvwx qr0s; CF=t
RL E ;E=vwxq ... -
bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …
... bytes, run time about 400 t-states. Of course, I would love ... -
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…
... game will have about 15K T-states available per frame. That's ... ][/B], so your game won't need to spend time drawing ... save you about 1.8K T-states (thus removing 4 rows will ... Spectrum attributes, so players won't really notice the difference.
Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... 48k derivatives that it won't work on. Has anyone looked ... you can tell I don't like this trick :D But ... would personally prefer a fixed T state delay following an interrupt, possibly ...Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... 48k derivatives that it won't work on. Has anyone looked ... you can tell I don't like this trick :D But ... would personally prefer a fixed T state delay following an interrupt, possibly ... and tricky but I don't see another method to do ...Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…
... take 10 T-states, whereas a JR (unconditional) takes 12 T-states, and conditional ... 7 (if condition is false) T-states.
This can be ... (HL) [4 T-states], JP (IX), JP (IY) [8 T-states] and finally DJNZ ...Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…
Well you should be looking for a profiler at least... Surely emulators should know how many T states each instruction takes and it would be easy for them to track it.IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…
... coding you don't need all that many T-states to do it ...IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…
... of the LDI intruction (16 T states per byte),
- but ... the sense that it doesn't need to be known in ...IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…
... the sense that it doesn't need to be known in ... trivial number of T-states.
I don't think Gasman's ...IF1bis vs SpectranetSince I will shortly have access to both an IF1bis (which I've bought) and a Spectranet (thanks to a loan from cmonkey), I will be in a position to g…
... using a trivial number of T-states.
[/QUOTE]
The ... />
[QUOTE]I don't think Gasman's video player ... hand, the last sector doesn?t need to be read to ...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…
... takes exactly [B]14100[/B] T-states.
If you want ... take exactly [B]14100[/B] T-states also, before it reaches address ...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…
What do you mean, count the T-states? Are you mad? Have you nothing better to do? :lol: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…
[QUOTE=joefish;746108]What do you mean, count the T-states? Are you mad? Have you nothing better to do? :lol:[/QUOTE]
It's just a strange habit I acquired in recent years :)ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…
... 1-TState accuracy. I don't know if Woody improved the ... i,a which is 9 T-states?Why are multicolour engines only able to be made now?Now I'm no programmer, but, how come multicolour engines are only being created/designed now? I know there were Rainbow Graphics used in games in the…
... game will have about 15K T-states available per frame, so
border), your game won't need to spend time with ... will save about 1.8K T-states. For instance, reducing 4
T-states available per frame.Z80 Asm EditorHi, I think this goes in here but if not then the mods can move it.... :) I have been knocking up a multi-tabbed, customizable docking editor for w…
... will tell you how many t-states are used by that code ...Z80 Asm EditorHi, I think this goes in here but if not then the mods can move it.... :) I have been knocking up a multi-tabbed, customizable docking editor for w…
... will tell you how many t-states are used by that code ... those sound good. Showing the t-states for a block of code ...Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…
... , 2MHz means you have less t-states for a given discretisation frequency ... . You won't be able to synthesize quite ... a PDM sample, you won't have any problems at all ...48k AudioI'm at the point in my game where I could use a few beeps and bloops. Ive been looking at loads of different speccy books, but this whole business of…
... off, what most people don't realise it that there's ... certain pitch. If you don't mind the sound being screechy ... />
Now if you don't mind just having some noise ... the screen display, 250-500 T-states (320-640?s) long. At ...Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…
... first draft and I haven't tried to compile anything yet ... , there's around 8-10 T-states of operation in part-prepping ... new value roughly every 31 T-States.
The sample is ... for the PDM isn't perfect to the T-State, but then ...
