-
What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... /> approx. 14,000 T states. But if
... approx. 2,400 T states; resetting
CP ... 465 T states, plus an additional 58 T states for ... -
What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
... the divIDE and Spectranet won't be able to load your ... /> ld a, 198 ; within 3000 t-states
cp b ; count edge ...
ld a, 203 ; 2400 t-states
cp b ; carry flag ... :
ld a, 22 ; 358 t-states
org 0x05e9
display file addressing; screen slicingWhile working on this Compendium I'm updating or rewriting a lot of stuff. One thing I eventually came to appreciate was the simple & clever way in w…
... to halt for a few T-States so the ULA can do ... frame.
BASin doesn't apply any contention (it makes ... do the job. Humans can't really differentiate when running BASIC ...LZ4 decoderI encountered the [URL="http://code.google.com/p/lz4/"]LZ4 compressor[/URL] a few weeks ago. Reading the [URL="http://fastcompression.blogspot.co.uk…
... reading this correctly (and counting T-states from memory), that saves 8T ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> be_ix_plus_3:
nop ; 12 t-state delay
nop ; 8 ... be_h_and_l_lp ; 12 or 7 t-state jump
dec b ... /> jp nz, be_h_and_l_lp ; 10 t-state jump
xor %00010000 ... br /> inc c ; add 16 t-states
jp (ix) ; jump ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... dec b ; reduce by 13 t-states
jp p, sa_leader ; ... /> dec b ; reclaim 13 t-states
inc a ; MIC ... ld a, 198 ; within 3000 t-states
cp b ; count ... /> ld a, 203 ; 2400 t-states
cp b ; carry ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... AY programming, so I can't comment with any authority; but ... with an equivalent number of T-states' worth of OUT instructions.
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... and friends using their spare T-states to display countdown timers, but ... possible.
47loader isn't nearly clever enough to do ...Timex 2068 hi-color / hi-res modes.Hello. I know this is not a Timex forum but since it is a very close relative of the Speccy I thought I'd ask my question here. Does anyone know …
... QUOTE=memrah;733821]But wasn't the 2068 ULA very compatible ... a video signal that doesn't work on a lot ... s no reason you couldn't make an SCLD (the ... different, both in the t-states before the screen blank and ... the US).[quote]I don't think software could tell ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... 'd need to leave enough T-states to update a counter, but ... hex.
It wouldn't be as elegant as, say ..."Press any key" detectionWhat would be the simplest way to detect if *any* key is being pressed? No LAST_K trickery, I can't rely on that. It has to be reading the keyboard p…
... is larger to count exact T states. The only difference is if ... use in_WaitForNoKey so that doesn't apply here :) Staying within the ... , CAPS or SYM shift won't count as keypresses and in_Inkey ...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…
... 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.
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:
