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tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
... [/I][/B] as B hasn't been altered since reaching zero ... saves a byte and 3 t-states. Sounds obvious, but it's ... code loading values that aren't needed at that specific point ... -
tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
... [/I][/B] as B hasn't been altered since reaching zero ... saves a byte and 3 t-states. Sounds obvious, but it's ... code loading values that aren't needed at that specific point ... -
Help understanding some z80 asmI'm trying to work out how to represent the structure of a "sprite" in the SAM as "Grabbed" by SmallC. I can see the assembler implementation but I …
... 1 m-cycle and 6 t-states (and a 1 byte instruction ... is 2 m-cycles, 10 t-states and a 2 byte instruction ... +d) takes a whopping 23 T-states! -
Help understanding some z80 asmI'm trying to work out how to represent the structure of a "sprite" in the SAM as "Grabbed" by SmallC. I can see the assembler implementation but I …
... 1 m-cycle and 6 t-states (and a 1 byte ... 2 m-cycles, 10 t-states and a 2 byte instruction ... +d) takes a whopping 23 T-states![/QUOTE]
Yes ... um, yeah this ret doesn't need to be here, doh ... />
Sometimes you can't avoid it, though, when dealing ... -
The 150 pound home computerWe missing out on this still ... I think. I know the PC market has wrecked all chance for any alternatives to ever have a hope but ... what if. :lol:…
... ;170552]Buying the chip isn't enough?[/QUOTE]
You ... off by default, you can't use it. That leaves licensing ... 's way. However, it doesn't support direct support of 24 ... Z180 averages a few less T States / instruction than a Z80 but ... -
Groundbreaking gamesWhich games really broke new ground? I mean the ones that actually got around the hardware limitations of the Spectrum. For example: Aquaplane - f…
... intros and the like isn't too hard, as programmer doesn ... 't have to worry about doing ... /> ...[/QUOTE]
I don't think that Aquaplane used some ... always have same count of T-states. -
Sound / Kempston EmulationHi I'm working on a spectrum emulator and I need som help. i still have loads left with the Z80 (not fully implemented yet) but I'm trying to get a h…
... ... without keybord support it wasn't so magic, but it worked ... I´ve got are missng t states for a number of instructions ... -
C# emulatorHi, I wanted to branch out and get a little better with C# so I think I need something meaty to do to keep me going....so an emulator seemed a reaso…
... /> After every opcode, test the T-States counter. When it goes over ... frame's worth of T-States) from your T-State counter. This will ... another frame's worth of T-States.
"frame time" is ... just that - the number of T-States in a frame. 69888 Ts ... -
Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…
... the top of my head: T-States counting next to each opcode ... -
Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…
... /> [QUOTE=Philip Kendall;177390]Can't this just be done with ... - I suppose breaking on zero t-states would do the trick. I ... -
Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…
... glitches, etc.
[QUOTE]T-States counting next to each opcode ... -
Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…
... the top of my head: T-States counting next to each opcode ... -
Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…
... - I suppose breaking on zero t-states would do the trick. I ... -
SpeedloadersSince I read Lee Tonks' post about the speedloaded version of MM3 he did, I've been playing around with various speedload routines I found on TTFn & …
... =Dr BEEP;51282]Why shouldn't it not run in the ... way. Spent hours checking my T-State counts and eventually it ... /> Does anyone know how many T-States the ULA spends holding onto ... -
SpeedloadersSince I read Lee Tonks' post about the speedloaded version of MM3 he did, I've been playing around with various speedload routines I found on TTFn & …
... ]Does anyone know how many T-States the ULA spends holding onto ... -
Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…
... the border (the first ~14000 t-states from an interrupt), it will ... -
Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…
... the border (the first ~14000 t-states from an interrupt), it will ... />
BUT, all this desn't apply to +2A,+3, where ... -
Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
If you don't have that many different characters ... will shave off a few T-states. You'll want your sprite ... -
Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... together with the amount of t-states they use, does anyone has ... -
Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... together with the amount of t-states they use, does anyone has ... -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... the comments are correct regarding T-states, but there you go.
t work and I'll have ... at it. Sorry it ain't pretty :)
[CODE]
; enter with HL = t-states to wait
; Pre-req ... -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... $8000
; enter with HL = t-states to wait
; Pre-req ... -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... to work... if you don't it'll just return.
t states.
And due to some ... code
; enter with HL = t-states to wait
; Pre-req ... -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... code
; enter with HL = t-states to wait
; Pre-req ... -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... even more. This version doesn't change the overhead (still HL ...
; enter with HL = t-states to wait
; Pre-req ... above bit of code won't fit.
ALIGN 16
How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…
... /> Is it known how many t-states in one second that is ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... 41 bytes and with 93 T cycles overhead (assuming I computed ... accounting for the extra odd t-states, which is where the table ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... takes 17), but that doesn't make for a very usable ...
; enter with HL = t-states to wait
; Pre-req ...Border emulationHow is the border emulated to do all the fancy little tricks such as in Aquaplane? I've got some basic border emulation working but it only displays…
... />
Keep count of your T-States with each Z80 instruction and ... to positions based on the T States since the last INTterrupt. Obviously ...Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... possible to reduce the minimal T-states. My program has a shortest ... run of 54 T-states, with CALL, RET and NOP ... added it becomes 89 T-states
[code]
org ...
