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Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…
... HL, which takes 11 T-states per two bytes.
... this is reduced to 6 T-states per two bytes.
... Z80, LDI takes 16 T-states per byte.
A ... memory timings would take 6 T-states per byte copied.
... which is something like 21 T-states per byte!
ROM Calculator TrigHello, These Christmas holidays I finally have time to devote myself a little to the speccy . I have a question about how the ROM calculator implem…
... be the counter for dec-jr-nz
CALL GEN_ENT_1 ;In effect ... be the counter for dec-jr-nz
CALL GEN_ENT_1 ;In effect ... FP_ADDITION
DEFB FP_DEC_JR_NZ ;dec-jr-nz
DEFB SINELOOP - $ ;;to ...Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …
... there is also one more T-state that is contended in ... T1 to be enlarged 6 T-states if the I/O access ... too would enlarge T2 5 T-states instead of 6, am I ...Fuse - HelpAs some of you might have guessed already, I'm kind of doing a rampage on a lot of emulators, to test things out, and find the most suitable for deve…
... file somewhere that I haven't seen yet, that has more ... of info.
Register, T-States, Memory Map, ok...
t help much).
Another table ...The history of ESXDOS, the DivMMC and the DivMMC EnJOY![img]http://benophetinternet.nl/hobby/divmmc_history/1%20esxdos.jpg[/img] These are the stories behind esxDOS, the most popular operating system e…
... .
Miguel doesn’t actually care how its written ... version, it just wouldn't have been possible without Alessandro ... separate CF card reader isn’t needed anymore
▪ The ... instruction, which takes 16 Z80 T-states.
The maximum data ...PUSH scrollers 3[url=https://drive.google.com/file/d/0B-KEeni1WXmoYk9Dek1zVnd6Rk0/view?usp=sharing]CATS - Faith edition (example)[/url] Hello and welcome to the w…
... /> There's about 10K free T-states each frame, mostly used here ... sprites. There's still some T's left after that, displayed ...Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…
... 00654
INC E
JR NZ, L_35381
L_35387: HALT
INC E
RET NZ
CALL L_35414
JP ... DE)
AND C
JR Z,L_35464
INC (HL ... HL)
AND A
JR NZ,L_35485
LD HL, MESSAGE ...New debugger features for ZEsarUX-4.1Hi I haved added new breakpoint conditions on ZEsarUX, the following 8 allow to put a breakpoint when accessing memory or i/o ports: MRV: value…
Hi
I haved added new breakpoint conditions on ZEsarUX, the following 8 allow to put a breakpoint when accessing memory or i/o ports:
MRV: value returned on read memory operation
MWV: value written on write memory ...New version emulator ZEsarUX-4.1Hi I have uploaded a new stable version of my emulator ZEsarUX 4.1 You can download it from the project page: http://sourceforge.net/project…
... /> -Improved debugger with new features: t-states partial counter, breakpoints on reading ...Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…
... H
DEC C
JR NZ, Loop2
LD H, & ... /> NOP
DEC B
JR NZ, Loop1
RET
[/code ...POKE taking a variable amount of time...Hi Folks, Does anyone know why the following POKE statements seem to vary in their execution time? [code]100 POKE 60000,10 110 POKE 60001,16…
... T states
Line 110 = 9,415 T states
Line 120 = 9,643 T states ...
Line 130 = 8,574 T states ...Fast way to clear the screen ?So I was wondering fastest way to clear the screen. I've tried this and this works but is it better than CLS ? LD HL,16384 LD BC, 6144 Loop…
Flood Fill IssueHi Folks, Came across the following Flood Fill routine by John Metcalf: [code]; scanline fill by John Metcalf ; call with d=x-coord, e=y-coo…
... a 60020 B7
jr z,goright 60021 28 ... 98 EA
jr nz,seekleft 60029 20 F4< ... d 60033 14
jr z,rightedge 60034 28 12 ... e 60051 1C
jr seekright 60052 18 E9
jr nz,nextrun 60057 20 CC
Other than using attributes what other ways to detect collisions, when using char based movement?So I'm slowly working out the bits and pieces to write a game completely in assembly. I've been using attributes when writing in BASIC to detect whet…
Programs with strict timing requirements.Hi, all, I am a bit stuck about the timings of my SpecIde emulator. (https://github.com/MartianGirl/SpecIde) The thing is, I think that the tim…
... I seem to be some t-states off. The Shock Megademo, for ... the scroller in SongInLines4 doesn't, either in +2A or in ...Limitations of emulationsYears ago at a trade fair, I got chatting to the guys who programmed [i]Gyron[/i]. They were demonstrating it and showed me an undocumented feature: …
... those things that just doesn't work under emulation. I can ... 't remember all the details, but ... lines of counting all the T-states needed to refresh just that ... ultra-hardware-specific and don't work on emulators?Spectrum and Z80 emulators with Python APIHello everybody, It may be the right time to create a topic for these two emulators. They are not at the initial release point yet, but might be w…
... require doing things like counting T-states for specific routines and automatic ... look like given I don't have to do everything manually ... course, this doesn't mean it can't have a GUI or ... ) so the resulting code wouldn't suffer from peformance overhead, spending ...ZEsarUX 8.0 stableHi! I've uploaded a new FINAL stable ZEsarUX version, 8.0 :) You can download it, as always, from the url: https://github.com/chernandezba/z…
... last opcode lasts >=32 t-states and interrupt in the middle ...How do emulators make code appears as running at 3.5Mhz?Decent Z80 emulators on github return t-states after executing an instruction, giving you the ability to emulate Speccy relatively well. But there ar…
... emulators on github return t-states after executing an instruction, ... are two issues I don't understand yet.
t-states (and may have up to 23 t-states), isn't ... 's resolution). Speccy t-state is 1/3 ... difference. For 4 t-state instruction that's ...Fixing a ZX Clone from .ru - 27 years late.Hi there, I've currently assembled another russian clone a "Compact 256 Turbo" from a PCB I bought. The machine appears to be fully functional and o…
... to be largely compatible (69888 T-States per INT, 295/312 Lines ...New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…
is a arduino uno / nano fast enough to talk to a specie ?my current project is to load games onto the specie via SD card / Arduino uno / nano although i suspect that the micro controller will not be able to…
... would take 1.5 specie T states..and a i/o cycle ... is between 3 & 4 T states so im trying anyway ... really ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ,A
........DEC E
........JR NZ,bit
........OR (HL)
........AND 7
........JR NZ,cnt ; only 1 every 8 ... AF
........DEC D
........JR NZ,vloop
........RET
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... it
........DEC E
........JR NZ,bit
........LD E,A ... adrescalculation
........DEC D
........JR NZ,vloop
........RETline routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
Timing through intrupt isn't the option. Calculate the number of T states for plotting your point. I haven't found a faster plot yet (see also my new topic).
