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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…
... is still in the border (the first ~14000 t-states from an interrupt ... under paper (lower area of border), memory is not slowed down ... and right border).
BUT, all this desn't apply to ... -
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…
... T-States with each Z80 instruction and when your emulator "realises" a border ... on the T States since the last INTterrupt. Obviously, if no border colour ... need to be refilling the border area. -
Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... the Min Size version (83 T States; no table) as although I ... the sprite (and not every line of the sprite).
line:
[code]
#DEFINE STEPDOWN ... -
Speccy emulator on a Nintendo DS, with M3 cartridgeAny recommendations for a good Speccy emulator on a Nintendo DS (using a M3 cartridge)?
... switch. Maybe I haven't found the option.[/QUOTE]< ... emulation, but I don't know for sure...[/QUOTE]< ... this to sample it once per line quite soon.
... commercial games. I haven't really checked, but I ... ARM7 code, so it doesn't work with homebrew.
... -
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…
... , which would show the t-state for each line of code, and ... they could print out t-states for each line of code in a ... -
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…
... click it to choose a line of code. Editing is done ... an option for doing pure line editing for the more talented ... be using it as a line editor, but with the extra ... (intellisense, jump-mapping, labels, defines, t-states and all that other good ... -
Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…
... there's only one statement per line, so I have now done ... very long statement. I don't think that'll ever be ... just too big, or didn't work out, because the ... design wan't quite correct. I may ... series, even though it isn't completed yet (This is ... -
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…
... a precise number of T-states before changing the border colour, then they ... coloured squares, a magenta border with horizontal lines and then ... ULA requires at least 2 T-states to read the display and ... So at least 3 contended T-states must pass before the first ... -
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…
... cycles. This doesn't tell us which T states were contended and ... much, nor how many contended T states there are. Then we ... the first and last contended T states, by running the instruction at ... are contended during the instruction (per given criteria), we have ... -
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…
... cycles. This doesn't tell us which T states were contended and ... much, nor how many contended T states there are. Then we ... the first and last contended T states, by running the instruction at ... are contended during the instruction (per given criteria), we have ... -
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…
... explain why it doesn't apply it during T3 ... low at start of those T states (thus the snow effect) ... byte fetches because there won't be time for the ... wonder if the timing isn't too sensitive.
line is active, whereas the ... -
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…
... the ULA must sample the line with the rising edge of ... contention during the following two T states, but this extending is what ... I haven't got from the schematics (yes ... -
Can you write in the border?Is it at all technically possible in any way to get stuff into the border, apart from changing the border colour? I believe the C64 used the border a…
... feature scrolling messages in the border.
The only ... 11 and 12 T-states respectively. In the upper border, each character ... width (=8 pixels) is painted in 4 T-states ... , where you can change border colour mid-character). All ... -
Problem with replacing all upper memory with 4164 chipsGuys, i have a problem with the high memory of a 4B issue. At first the board had OKI chips for high memory and one of them was faulty. Since its ea…
... write cycle, the WR line on the Z80 goes low ... for one T-state (the falling edge ... full memory write is 3 T-states) which will be 285ns. ... goes active for longer (2 T-states), but the actual important ... which is probably only 1 T-state. (Someone who's ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... /(129-17) = 1.57 bytes per line of assembly code.
per line. Having a look at the ... the project so we don't need to worry about it ... -
How many expansions can a Speccy handle ?How many expansions / interfaces / addons can a Speccy handle ? I'm not thinking about the issue of powering the interfaces through the Speccy's PS…
... takes the same number of T-states regardless of the number of ... port, and activating the IORQ line.
If each device ... , the Spectrum's design doesn't allow for more without a ... -
Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... for faster indexing. And don't use the index registers. Ever ... two versions take the same T-States.
I am using ... "read" from it only once per loop it is relatively minor ... />
I will do a T-State count to see if ... -
Timex questionI've been writing a program for CCG2008 and it actually has a use for the 512x192 mode of the Timex computers. I read up about port 255 and how the d…
... I only need 64 chars per line - so 512 pixels is just ... where possible.
I couldn't use BASIC for the task ... -
Announce: BASin r14b availableHere's the fix mentioned earlier for those of you that either are too lazy to update your OS (XP SP2 has been out aaaaages, Arjun!) or even junk that…
... program:
[CODE]10 border 0: paper 0: cls
t edit any line, the cursor isn't available and the ... mouse selects a full line ... , not just one character. Pressing Esc doesn't make ... -
Multiplayer online Speccy gaming - an actual technical proposalAs is so often the way, [url=http://www.worldofspectrum.org/forums/showpost.php?p=274215&postcount=121]trying to put into words why something is impo…
... clients know how far (instructions/t-states?) to execute within a frame ... only roll back on a per frame basis.
I ... -
Help with hi-res 40 column fontI have created a 12x8 pixel font for use with Timex hi-res (Mode 6).
... as 16x8, ie: 2 bytes per line. If the last 4 bits ... . Sorry if this bit doesn't make much sense.
Help with hi-res 40 column fontI have created a 12x8 pixel font for use with Timex hi-res (Mode 6).
... addresses have to be written per line) - rotates the character by the ... .
My routine isn't likely the world's most ...CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …
... . Unfortunately the version released doesn't work on a TS2068. The ... see the full 64 characters per line display.
I've ... a C64 BASIC program isn't easy. :-x
I ...CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …
... . Unfortunately the version released doesn't work on a TS2068. The ... see the full 64 characters per line display.
[/QUOTE]
Good 128k +2 emulator for Windows XPWhat emulator would you recommend for windows XP, to emulate 128k +2 Spectrum. I want to play Turbo Esprit like I did all those years ago! :-)
... ;291362]Tsk. Can't think why anyone wouldn't want to use ... for me):
- I can't debug while playing an RZX ... horrible
- Single stepping doesn't give the current state information ... just shows the number of states per frame (Jimmy's issue #5 ...Messages in 'Invasion of the Body Snatchas'I searched the forum and checked the [URL="http://equ.in/ox/spectrum/eggs/"]Easter eggs page[/URL] but couldn't find any reference to the messages I …
... I must admit I didn't test to see just how ... table can be - 125 chars per line, cripes! That's a hi ... to hear it :) I couldn't see any TRS DOS code ... Design Design games. I can't really explain - some of the ... on WoS, and I can't get into any of them ...Changing the way SCREEN$ is loadedThe way the speccy loads in a SCREEN$ is interesting - top two-thirds first, then middle and finally the bottom, which is due to the way the speccy d…
... backgrounds with 3-4 colours per 8x8 square?
[/QUOTE]
t have video line interrupts like for example ...BASin r14c - maintenance releaseAfter the recent discussions, BASin has been released as version 14c. It's only a maintenance release, and some of the really big new features are un…
... the window:
Bytes per line - how many bytes you want ... />
Start/Step - line numbering. Enter the lowest line you want created ... in mind that you can't use line 9999 unless all your ... DATA will fit on one line!
Include Pokes - ...12-pixel-wide font on 512x192 screenThanks to Geoff I have a working prototype for displaying this font in BASIC. Machine code to follow.
... also means it doesn't matter where the column ... up consuming a fair few T-states.
For my ... simpler routine which doesn't need to rotate the ... on, I don't actually store the line, rather the start ... in RAM of the line which eliminates the need ...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…
... very different (read takes less T states).
i would say that ... Z80 could be faster but line drawing will be comparable.
t seem to get much/any ... else useful that I haven't mentioned?[/QUOTE]
what i ...
