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yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... ' heap before jumping into the real memory allocator [URL="http://z88dk ... it. It takes as much time / space as it takes. The ... ) and decide if the % of time spent in context switch is ... when measuring time on the z80. One T state = 1 clock cycle ... -
How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…
... ram in a real spectrum by stopping the clock signal to the ... , when finished it starts the clock signal again. I think it ... by f**king with its clock signal) when there's a ... be accessed with a certain time (usually some milliseconds). Since displaying ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... 've ready anywhere for some time. Excellent work!
Possibly ... . I just checked it on real hardware and /HALT goes low ... the falling edge of the clock in T4 of HALT's ... -
List of existing games that needs a port to zx spectrumPlease post here the games that exist in other platform(s) but does not exist in speccy. Please keep in mind this is not a to-do list, so don't hesti…
... ;549169]I suggested that some time ago.
[url]http ... Z80 running at a high clock speed, dedicated video RAM and ... the original spectrum if the real computing is done in the ... -
R-Type: Good or horrible?I know, right? R-Type. The jaw-dropping poster child for Speccy brilliance? How could I even suggest such a thing. Well, here's the thing. It is…
... to keep moving all the time and sometimes just on instinct ... 5 o'clock on a Friday afternoon and a real disappointment, nothing ... -
cash machines being rubbishjust wandered around trying to withdraw some money from 5 different machines, all of them say invalid transaction. they let me check my balance but n…
... I get this all the time. They lock the card because ... a different spending pattern. Last time I was in London they ... .
* They did detect real fraud on my parents' card ... much better than a stopped clock's ability to tell the time. -
Amazonia (BUGFIX)This is a bugfix for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027280"]Amazonia[/URL], please add the following "known errors" des…
... do so. The clock shows an invalid time for 5 minutes every ... 2 hours, but since the clock ... doesn't have any real purpose in the ... players would still have the clock after playing this game for ... -
I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…
... sure I really have the time, so many games to play ... so little time. I wish work would just ... a couple of days in real life :o
Takes ... /> So I set my PS3 clock 2 days ahead and it ... this without messing with my clock I'd have been waiting ... -
Puznic in colournuff said!
... to fall at a time. I bet a real hacker like Bandit ... each time. For a game that requires running against the clock, loosing ... the cursor all the time is very ... -
Most accurate timingWhich emulator is closest in timing to an actual (48k) spectrum? A count to 10,000 loop, printing the loop number each time on screen - same snapsho…
The whole point was to time sound effects with a stop ... I can make sure the clock is at least roughly adjusted ... this loop takes on a real spectrum actually has no benefit ... so I can deduct the time taken for the loop ... from the actual time taken to make 10, ... -
SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... you print this picture to real size (it's a 300dpp ... /> I'm waiting for some time (and money) to build a ... oscillator feeds the DCM (Digital Clock Management) inside the FPGA, which ... (using a 56MHz S-D clock). Here the RGB signal generation ... -
SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... you print this picture to real size (it's a 300dpp ... /> I'm waiting for some time (and money) to build a ... oscillator feeds the DCM (Digital Clock Management) inside the FPGA, which ... (using a 56MHz S-D clock). Here the RGB signal generation ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... - in other words, regenerating the clock signal which goes away during ... go and test the clock recovery with a real machine :-) (Incidentally this ... make its output run in time with where the ULA thinks ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... - in other words, regenerating the clock signal which goes away during ... go and test the clock recovery with a real machine :-) (Incidentally this ... make its output run in time with where the ULA thinks ... -
Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…
... ). One set-up and hold time violation was found in this ... signal synchronous with the reference clock. It actually worked correctly with ... is to try it with real hardware but I'm going ... -
Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…
... timesaver!) it was time to test it on the real hardware...
clock regeneration PLL, which is ... is the master clock for the Spectrum clock regeneration digital PLL ... 6 cycle contention. The Spectrum clock, after passing through the ... -
Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…
... bits wide
clk pin ; "Clock input
rst pin ; "Asynchronous ...
count.clk = clk; "Counter clock input
count.ar = rst ... /> module unicnt (
input clk, // Clock.
input rst, // Async. reset ... -
Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…
... and at the same time forces 0's on ... 4 clock cycles @ 3.25 MHz, in that exact time ... the ULA sends 8 horizontal pixels to the screen (pixel clock ... MHz, double the CPU clock and synchronized with it). ... is the real problem: there's very little time between ... -
What games benifit from having a faster spectrum?I'm using Spectaulator atm and have been playing around with the mhz slider. Could real Spectrums be added to or altered to act this way? Could the…
... you can "under clock"[B]*[/B] a real Speccy with a joystick ... ] [I]I'm sure "under clock" is not technically correct, but ... 's not really underclocking. The clock speed remains the same, but ... lower memory at the same time.
Incidentally, the Z80 ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... the CPU clock and fetching video bytes, which is wasted time if ... contention - and it's a real spectrum with standard SDRAM (none ... -
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…
... going on, given enough time... Surprising as it may ... these codes, but the clock is ticking and Jan Bobrowski ... Hats off to them any time, day or night. What ... one really knew at the time what "the correct" behaviour ... the pixels like the "real" floating bus. All in ... -
ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…
... what a distorted ULA clock output may be like, ... available to me at the time (as I do not ... are taken from real hardware. The clock signal from a ... br />
As the clock output from some Spectrums does ... the processing of the clock signal and the propagation ... -
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.…
... was decided concerning max time between DRAM row ... the datasheet required refresh time (seems that tolerances ... Way within the datasheet required time for refresh cycles.
In the real C64 this is not a ... during half of every clock cycle, thus giving the ... -
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.…
[QUOTE=mcleod_ideafix;789102]In the real C64 this is not a ... busses during half of every clock cycle, thus giving the VIC ... microsecond. This is just enough time to complete two read cycles ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... your modern song isn't "real" rock n roll, others will ... + specification, and around the same time I (privately at that point ... ", but I really wanted a "real" machine which implemented ULA2. So ... speeds derived from the VGA clock). A rudimentary floating bus is ...
