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"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 ... shift won't count as keypresses and in_Inkey() will treat multiple keypresses ... -
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 exactly the ... -
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 ... EX AF,AF' was in operation. It works, but its an ... 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…
... EX AF,AF' was in operation. It works, but its an ... operations. Its just those 8 t-states they eat up, maybe a ... -
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 about ... ][/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.
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]
per video byte plus 105 ... cycles overhead per packet? , which may ... />
[QUOTE]I don't think Gasman's video player ... the last sector doesn?t need to be read ...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
it ...
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.Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... from the attributes every t-state (one byte per t-state, interleaved, i ... read of an attr byte per 4 t-states, i.e. the full ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... sure they simply didn't use versions of the ... the attributes every t-state (one byte per t-state, interleaved, ... of an attr byte per 4 t-states, i.e. the ... .org/forums/showthread.php?t=41048&p=659785 ... memory is actually accessed twice per 1 CPU cycle, making ...Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…
I don't know the answer you want, ... [/FONT] [FONT=sans-serif]four T states. The CPU will sample the ... be either a memory read operation (/NMI) or an interrupt acknowledge ...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…
... you saying there were less T-States (and was surprised) and was ... as there is less happening per frame, but there is 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…
... Majikazo), and under around 5000 t-states.[/QUOTE]
You're ... think just animating less tiles per frame will be easiest and ...ZX-Modules app reportZX-Modules app report If You are interested, I want to report about the state and progress about my ZX-Modules programs. I would like to report at l…
... /where they are found when multiple.
Thanks ... B or so have 4 T-States, while LD B,(HL) ... ability to list the T-States of each line in ... and graphics drivers :-) the T-State calculation will be ... to put in all those t-states, but this has to be ...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, so
it ... border),
your game won't need to spend time with ... will save about 1.8K T-states. For instance, reducing 4
Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... . The 4116 DRAM datasheet states that a memory read should ... possible, thanks to the interleaved operation of the 6510 processor, ... screen RAM. The datasheet states that the 4164-2 DRAM ... 35 T-states, not couting the RET instruction. Yours last 53 T-states, not ...Command and Conquer type game?Hey all One of my all time favourite games although not spectrum based, is the Command and Conquer series. I'm sure many of you are famailiar with…
... full screen maze about once per second. This should work just ... short time (between 11K T-states and 12K T-states) to calculate just a ... and number of goals don't make much difference for how ...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…
... you know how many t-states it takes per line. Everything beyond that ...Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
... starts always at the same T-state (related to the moment ... last a number of T-states which is a multiple of 4, and ... aren't HALT last a number of cycles which is multiple of ... described in Rotatrix documentation doesn't require any of this.Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
... it has finished, so whatever T-state the CPU was at ... finish it in a certain T-state which is somehow "aligned ... of T-states from that moment, until the interrupt comes, is a multiple ... I have tested, this doesn't work if the computer has ...Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
... has finished, so whatever T-state the CPU was ... it in a certain T-state which is somehow ... T-states from that moment, until the interrupt comes, is a multiple ... have tested, this doesn't work if the computer ... Therefore this technique won't work in Pentagon machines ...Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…
...
DEC B ;+1 t-state per frame
AND B ;for ... of their frame with 8 t-states precision and also because it ...speccy 2020Yep, re-made speccy 2010 is ready.. it is called speccy 2020cr - soon preorder. small changes in design, big changes in layout :-) [IMG]http://mmj.p…
... ]Speccy 2020 (nor 2010) haven't the HDMI output.
states per scanline. I have sucessfully run ...64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... 64x48 bytes buffer, 1 byte per pixel, then a renderer ... a nibble (half byte) per pixel, thus storing 2 pixels ... If you stored 1 pixel per byte, fastest way to ... if you stored 2 bytes per pixel, fastest way to ... 32 times, taking 22 T-states for each 2 pixels without ...64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... a nibble (half byte) per pixel, thus storing 2 pixels ... If you stored 1 pixel per byte, fastest way to ... if you stored 2 bytes per pixel, fastest way to ... 32 times, taking 22 T-states for each 2 pixels without ... update, and it matters for per-pixel effects. At the ...64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…
... =65 t-state (per half a character). 65*768*2=99840 t-states. You ... just calculated that the overhead per chunk in ... your method is 29 t-states. Well, with ...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…
... than 224 t-states, and the number of t-states is a multiple of 8 ...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…
... with measuring T-states in contended memory if the wait per byte is ... constant. It has a "t(mem)" function ... 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 ...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…
... with measuring T-states in contended memory if the wait per byte is ... same number for t(start), t(start+1) and t(start+2) since ... 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…
... somewhere else, perform an arithmetic operation on a register or value ... 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 ...
