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draw single pixel in the borderI have problems with drawing in the border. I can get it to draw a line ,but it always becomes a line and not a single pixel. <br><br>rept 3580 <br…
... travels in how ever many T-states OUT takes. If the Z80 ... line, but alas it isn't so you can ... -
Fuse tests - INC BC causes contention delayHi all, In the FUSE test suite it has the following for the output of opCode 0x3 (INC BC): 0 MC 0000 4 MR 0000 03 4 MC 0001 …
... each of the last two t-states. Paradoxically this happens because there ... -
Basic SAVE and ZX Printer supportIs there a list of emulators that support any of these two features (basic SAVE and print to printer port)? Is there a emulator comparison some wh…
... following structure:
- PULS 2168 t-states
- DATA bytes: "fillscr" CODE ... 32768,156
- PULS 2168 t-sttes
- DATA 1264 bits ... 4 times, but BASIC, doesn't seem to ever finish loading ... -
maths help 'JSW'JET SET WILLY uses a lookup table to play the opening tune (Moonlight Sonata) this is the table [code] 34299 DEFB 81,60,51,81,60,51,81,60,51,81,…
... pitch he wanted - I can't see any way to go ... -versa unless you start counting T-states for each possible note. To ... the number of t-states in that routine with the t-states used in ... -
Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... ; save 3 bytes and 10 T-states
[/code]
The ... -
Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... DJNZ takes (usually) 13 states, and the outer loop ... n + 14 * (n / 256) T-states)
Another mistake is ... "This only takes 28 T-states for if. A small ... takes 31 T-states, not 28, saving just 2 T-states and ... 2 bytes (and no T-states) if the initial one ... -
Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
... mistakes: DJNZ takes (usually) 13 states, and the outer loop is ... (13 * n + 14 * (n / 256) T-states)[/quote]
Actually it ... (13 * n + 9 * (n / 256) T-states), approximately. Every 256 iterations, the ... -
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…
... , NIRVANA_fillC, NIRVANA_readC) are now 3 T-states faster each. The addresses of ... download this engine update, don't forget to also download the ... -
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…
3 bytes, 3 t-states does not sound a lot, but with the time critical routines in Nirvana it is a matter of the colours working or not. Well done indeed for improving them. -
1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…
... more than 224 t-states, and the number of t-states is a multiple ... -
Advices for double buffering ?Hi, I'm currently coding graphics routines for a forthcoming game, I use a double buffer (the dummy screen is at $e000, the code at $8000) to pro…
If your screen update doesn't take longer than 1-2 ... screen area at around 15K T-states, so e.g. you ... begin. In fact it doesn't really matter where [i]exactly ... so that the beam doesn't catch up with you ... about 90-93K T-states, a frame is about 70K T-states so by ... -
Full-screen 32 columns bicolor engine NIRVANA+I'm glad to announce the release of [b]NIRVANA+ ENGINE[/b], providing support for bicolor graphics (multicolor 8x2) in 32 columns for all standard Sp…
... always enabled, otherwise it won't work properly.
Actually ... so much control about execution T-states, so this problem is more ... -
Full-screen 32 columns bicolor engine NIRVANA+I'm glad to announce the release of [b]NIRVANA+ ENGINE[/b], providing support for bicolor graphics (multicolor 8x2) in 32 columns for all standard Sp…
... install script didn't work, so I don't have that defined ... so much control about execution T-states, so this problem is more ... -
Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…
Here's a T state delay routine, might come ...
; Usage: HL=delay, T states; HL > 123
Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…
... T-states (a T-state is a CPU clock cycle, about 290ns). 224 T-states ... , changing the colour every 224 T-states (or every 64 microseconds) will ...Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... measuring where in the frame (t-states) the #FF routine triggers, then ... . This happens at approx ~14500 T-states into a spectrum frame.
T-states, ie if it is entered ... exit at approx 14,500 T-States. It checks for the floating ...Interface 1 - RS232 question.I am thinking about doing some Spectrum stuff based around the RS232 port used on the Interface 1. Has anyone had any joy doing this with an emulator…
... though. It takes approx. 30 t-states to send 1 bit. With ... that's 300 t-states for a byte or 9600 t-states for 32 ... i.e. out of 70k t-states per interrupt. That is approx ... a valid reference. :)
T.Best Z80 Assembler for PC?There's probably already a thread for this so if somebody could please point me at it I'd appreciate it. If there isn't then please respond here wit…
... zmac could help with measuring T-states in contended memory if the ... push af
cost equ t($)-t(start)+$-start[/code]
t(start+3) == t(start) + 13 as "ld a,(n)" takes 13 T-states ... . Arguably t(start+1) should equal t(start) + 4 and t( ...Best Z80 Assembler for PC?There's probably already a thread for this so if somebody could please point me at it I'd appreciate it. If there isn't then please respond here wit…
... /> zmac could help with measuring T-states in contended memory if the ... same number for t(start), t(start+1) and t(start+2) ... t(start+3) == t(start) + 13 as "ld a,(n)" takes 13 T-states ... . Arguably t(start+1) should equal t(start) + 4 and t(start ...Emulator developmentHi, Could anyone explain or direct to a link that explains in not to technical terms how an emulator is developed. It has always blown my mind eve…
... a count of how many T-States that instruction and its values ... . When you've done 69888 T-States (for a 48k Speccy) then ... interrupt, subtract 69888 from your T-State counter, and go back ...New multicolor engine BIFROST*2[img]http://s15.postimg.org/rfue0jb3v/BIFROST2.png[/img] [b]BIFROST*2 ENGINE[/b] is now available! Download it here: https://www.dropbox.com/sh…
... beeper effects in under 10K T's[/quote]
OK ... so, multicolor engines leave 20K T-states free or less (depending on ... many multicolor rows). Spending 10K T-states on beeps is probably too ...Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…
... bytes for a few less t-states, is it really worth it ...Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…
... really exploiting the full 224 T-states available on a line; certainly ... , where there'd be 20 T-states spare.Manic Miner ported to Atari 800XLYep, they finally ported it :) http://atariage.com/forums/topic/252067-manic-miner-released/
... cartridge to use BASIC) weren't too impressive graphically, from what ... hardware registers, the display isn't memory mapped.
... the fact that there aren't any hardware interrupts to ... its all down to counting t-states.
Which makes ...Manic Miner ported to Atari 800XLYep, they finally ported it :) http://atariage.com/forums/topic/252067-manic-miner-released/
... the fact that there aren't any hardware interrupts to tell ... its all down to counting t-states.[/quote]
Interesting. It ...
