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Emulation vs SpecApologies if this is an old thread, what does anyone think is the best - playing spectrum games through emulation or on a real speccy? I feel it's b…
... little attempt to get correct instruction timings, deal with the R ... of work to play a single game!
So emulation ... -
A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…
... few cheat sheets for the instruction set there, which are handy ... upper address byte resets a single bit at a time (one ... -
A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…
... upper address byte resets a single bit at a time (one ... specifically defined by the LDIR instruction. The microcode will actually be ... CPU to perform an LDI instruction followed by a test to ... bytes to run the LDIR instruction again and again. -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... last cycle of a finishing instruction, and then responds immediately. Thus ... adjusting a delay before a single contended instruction and then measuring the ... IO part of an IO instruction, the contention starts 2 T ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... which don't use a single IO instruction have identical behaviour on ... -
What did Spectrum BASIC lack (and was BBC BASIC so good?)Over the years, I've read in various multi-format magazines, that BBC BASIC was probably the best BASIC available on an 8-bit machine. I've never use…
... though it was a basic instruction, and just farm it ... using the Spectrum 48K's single key entry system, and ... Spectrum's did away with single key entry (in 128K ... mode). The BBC's single key entry system is a ... as the Spectrum's single key entry and editing abilities ... -
Z80 Developer ConsoleHi, This is a project I have meaning to do for ages, recently had a kid, had some time off work (as a software developer) and surprisingly had a bit…
... text version of an assembly instruction).
4) Using combo box ... you cannot see in a single view all the functions available ... a Call, JR or JP instruction it would be handy to ... -
Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... the ULA responds to every single even numbered port address). This ... of the OUT instruction) all you need is a single chip to ... port decode. For just a single bit, something like quarter of ... -
50Hz on PC?Hi, do you know of any emulator for PC that can switch monitor refresh rate to 50Hz or closest possible and sync ZX interrupt with monitor refresh?…
... the noise exactly when the instruction happened.
The emulator ... />
In my experience, a single-frame (20ms) delay is barely ... -
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... 's main RAM. Given the single cored nature of a Speccy ... try to execute the first instruction (then set A15 high to ... -
How does the Z80 work internaly?How does the Z80 work internaly, i.e. how does it actually execute a machine code instruction? When it fetches a byte from the memory and finds, for…
... - a latch to store the instruction byte over the course of ...
So... it receives the instruction, sticks it in the latch ... instruction set, you'll see some regularities in the binary patterns - single ... And that's the INC instruction done... on to fetching ... -
The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... 's /RD (or any other single signal), you could buffer (and ... signal "stronger") it with a single bipolar or MOS transistor,[/QUOTE ... M-cycle of the INIR instruction (this is the actual I ... -
About Microdrives.I have my three microdrives sitting pretty on m new shelves above my monitor. I have never noticed it before but the tape heads look like stereo one…
... ) with the Z80's INIR instruction. I think that there is ... along the way but a single track would not have cut ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... USR 32000)
The only instruction I don't understand is ... how many cycles an ex instruction takes?[/QUOTE]
ex ... up in memory so a single sequence of pops reads the ... code the scroll in a single monolithic code block like this ... -
Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…
... the interrupting device supplies a single-byte instruction to execute during the ... is usually a RST n instruction.
Different from IM ... -
CPU question about various emulators for and on various machinesRight, you know how nowadays the latest CPUs seem to be dual (or more) core 2.4GHz (or whatever speed) as opposed to, say, single core 5.8GHz? Now I …
... speed) as opposed to, say, single core 5.8GHz? Now I ... />
[QUOTE]I mean, my single core 2GHz laptop can only ... it came across a branch instruction it could take both paths ... -
CPU question about various emulators for and on various machinesRight, you know how nowadays the latest CPUs seem to be dual (or more) core 2.4GHz (or whatever speed) as opposed to, say, single core 5.8GHz? Now I …
... that would require a single core CPU of say 3GHz ... example, your Xbox has a single CPU, and good graphics + ... a (in effect another single core) 2.8GHz CPU, ... came across a branch instruction it could take both ... good Superman game. Every single one seems to be ... -
Speccy LaptopHi, Since my subtle announcement in another thread was underwhelmingly too subtle, I'll repost it in a new thread ;) I have started work designing…
... fastest instruction takes 4 cycles, most AVR instructions complete in a single ... -
Microdrive Help...Hi All, I need a little help.. I would like to transfer one of my all time favorites to microdrive "Atic Atac" (for which I have an original tap co…
... /> in the compressed block, a single RANDOMISE USR call will "reclaim ... value (via a suitable CLEAR instruction) and the block of
Retro-X Alpha availableChanges from WIP 7 (Alpha 3) to Alpha 4 ( 1.5.08 - 14.5.08 ). Requested by and help by - in brackets. Bugfixes: * Viewer: o File list not displaye…
... , I even wrote in the instruction that it won't run ... you even to edit every single frame of your Anims in ...Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
... ! Setting PC to $0000 and single stepping immediately takes you to ... and it knows when an instruction crosses the boundaries of a ... say you could assemble your instruction once the next version is ... - throw an error, as your instruction does not fit into available ...what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…
... on lesser frequency but its instruction timings are very different (read ... a few times and every single time someone explains why the ...Watching screen while debugging???I'll try to state my problem clearly, but I don't know if I'll succeed ..:) I load a Spectrum program into emulator (it doesn't matter which one at …
... 't see the results of single instructions writing data to screen ... the corner immediately after the instruction and the emulator won't ...Watching screen while debugging???I'll try to state my problem clearly, but I don't know if I'll succeed ..:) I load a Spectrum program into emulator (it doesn't matter which one at …
... the corner immediately after the instruction and the emulator won't ... possible to update after every single step, I'll ask Marko ...Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... also reduced it to a single assembly source file, here is ... ;The code self-modifies this instruction,inserting the SEED here
BASin Assembler suggestionsHi Dunny. According to your former request here goes a few suggestions. Been playing around with the Assembler and I'm glad I did. Quite nice indeed…
... displaying the opcode of each instruction as its entered.
... A second column displaying that instruction size in bytes
... A third column displaying the instruction clock cycles
At the ... better if you also allowed single register (8-bit) viewing. ...how to reflect a byte's bit-pattern in assembly?I'm trying to use 16 pixel-wide graphics which are symmetrical around the vertical, i.e. if the left byte is 01001110 the right byte will be 01110010…
I remember that when I started to learn Z80 assembler, I believed there must be a single Z80 instruction that will mirror the byte just like CPL inverts 0s and1s.
It was dissapointing that I had to do it myself :)how to reflect a byte's bit-pattern in assembly?I'm trying to use 16 pixel-wide graphics which are symmetrical around the vertical, i.e. if the left byte is 01001110 the right byte will be 01110010…
... believed there must be a single Z80 instruction that will mirror the ...Your help needed![FONT=Arial]there are [URL="http://www.worldofspectrum.org/neededscreens.html"]a number of titles[/URL] (146) that still lack an in-game scre…
... ![/b] and is just a single BASIC line modificaion to that ... the archive is of the instruction page, so it looks different ...
