-
ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p
... in.
- A port read from port 0x7FFD writes the floating bus ... - A few more breakpoint events in the debugger, mostly for personal ... became optional.
- Makes breakfast in bed
- Boost saving ... to the first person in this thread who acknowledges ... -
Quotes from Speccy GamesTry to find this one: "No Sax please, We are Egyptians!"
... br /> The game in question uses the "floating bus" for synchronisation with ... ld a, 40
in a, (255)
cp ... /> ld a, 40
in a, (255)
cp ... -
Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... Indeed, this is the "Floating bus" issue mentioned by Phillip.
floating bus" instead.
floating bus" method of screen ... floating bus behaviour, and therefore these games just freeze within the "IN ... -
Questions about the Speccy and it's emulationOut of interest, and to raise another interesting discussion, I have some questions about the Spectrum and it's emulation; 1) Is everything known ab…
... (or did not) emulate the floating bus at the time.
floating bus code with a [b]halt ... precisely timed replacement for the floating bus code in an official retail product? -
I just learnt that Spectrum has 1kB of unused ROMWell, man learns through all his life. I have just discovered that Spectrum has over 1 kilobyte of unused ROM memory, from address 14446 to 15615. Al…
... reason for the big gap in the ROM is that it ... pushing random values onto the floating bus -- or they don't bother ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... haven't come up yet in this thread.
[QUOTE ... bottom border by reading the floating bus and looking for a particular ... -
RUSSIAN SOFTWARE and real ZXRussian ZX games is writed on russian ZX clones and support hardware feature TURBO OFF ( for ZX clone ZS SCORPION ). Russian ZX clone ZS SCORPION use…
... / +2(grey), then data from floating bus is writed to paging port ... use same adress/port decoder in chip HAL10H8 ( or PAL10H8 )
in I/O write cycle and ... disabled in read cycle. New correct equation ... -
People holding back the emulation sceneAs mentioned once again in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=22690"]this thread[/URL], some people think Ramsoft willfully…
... found more and more inaccuracies in RealSpec and downright dodgy ... methods used in MakeTZX (mostly things like ... looked plausible but would not in practice work, and more ... i] in the case of the first version of the floating bus documentation ... -
Batman crashes on MobileZXDear all, I'm one of the authors of MobileZX ([url]https://sourceforge.net/projects/mobilezx/[/url]) and find that Batman crashes within a few secon…
There's a few more games listed in the [URL="http://scratchpad.wikia.com/wiki/Floating_bus"]floating bus[/URL] section of the tech wiki that probably also fail then. -
TIMEX Sinclair 2068 => ZX Spectrum/Timex2048?Hello. I have opportunity to buy Timex Sinclair 2068. According to www sites dedicated to Timex machines, TS 2068 can handle only 7% (!) of Spe…
... to find such a cartridge in my place (as well as ... 50hz, different T-states, no floating bus on port #FF). More than ... for adding 128K of RAM in the EX and DOCK banks ... /> >sticking the original ROM in place of the HOME ROM ... -
Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…
... 0xff on the data bus at interrupt time, thus ... in interrupt time (only with pull-up data bus via ... fixed vector table adress (correct floating bus value):
===========================================
... K-MOUSE return to data bus correct 8bit low adress ... -
Games not working on Timex 2048Timex 2048 is a very good Spectrum 48k clone, over 90% of games work fine. But there are also not working games or working but not properly. Is there…
... the SCLD data bus from the z80 data bus with resistors as ... done instead with a standard bus transceiver chip. A consequence is ... unmapped port as is done in a handful of Spectrum games ... differences in the bus coupling the TC2048 doesn't support a floating bus on ... -
Maze Mania - How did they do it?Hi, I was looking at the game "Maze Mania" by Hewson Consultants, written in 1989. The game can be downloaded from here [URL]http://www.worldofspec…
... (floating bus check). when it is finished the beam is somehere in the ... would recommend to count frames in Mazemania and you will see ... -
Russian Translations...As i have once again been reminded (by the "Homebrew games" thread), there are some funky looking Russian games that I can't play due to not understa…
... I made have sometimes resulted in loading errors and I don ... original) and perhaps some minor in-game tidying up, but this ... aware of the +2A/+3 "floating bus" (or lack of) issue and ... -
Which is the most technically accurate Spectrum Emulator?Ok, which is the most technically accurate Spectrum Emulator? Please don't just vote but give reasons why.
... ... passed
Contended IN... passed
Floating bus... passed
Contended ... ... passed
Contended IN... passed
Floating bus... passed
Contended ... ... passed
Contended IN... passed
Floating bus... passed
Contended ... -
+2A/+3 compatibility fixes thread!It might be a good idea to keep these fairly common +2A/+3 compatibility fixes (and requests) in a single thread for quick reference ;) Let's start …
... /> The in-game sound effects routine also used the floating bus so I ... -
Sigh... it's *never* big enough...The 200GB disk I use for my projects is now full of stuff which I don't want to delete, stalling further progress on the Xmas Special. The joys of wo…
... ) had a 1GHz front side bus in 1989... but it did need ... MHz ARM. The app, written in C# with a presumably bloated Jet ... could code the same app in C (not even asm) for a ... -
Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
... tricks they threw at it (floating bus, contention, whatever), then, to me ... circuit, RAM, ROM, Modulator etc in their rubber key machine is ... in danger of being branded a " ... -
Where's the border line between a Spectrum and something else?I mean: there are purists out there that consider that anything that is not a true Sinclair Spectrum, with a true Z80 and a true ULA, and at most, 48…
... clones, the only tricky component in a Speccy is the ULA ... to know very well and in depth what's going on ... rely on that complex ULA/floating bus behaviour, and any FPGA-based ... -
The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…
... I haven't investigated that in detail though.
[/QUOTE ... be implemented in asm. Keeping the libraries in asm is ... very central to keeping compiled C ... floating point library out there implemented in C that would do well implemented in ... -
+3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…
... , the Z80 will read "FF" (floating bus), which is the opcode of ... will push another two bytes in the stack.
So ... -
Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…
... or there's something broken in the Speccy's video ... could have a broken transistor in video output stage, broken video ... equation. And perhaps: (blind) type in some commands to make a ... the picture, it finds nothing (floating bus) and hence, the value read ... -
worth buying a zx spectrumAs i have been watching Micro Men i have been really thinking about buying another Spectrum. Now as i grew up in the 80's and was a massive speccy fa…
... ]
This one adds floating bus support:
[url]http ... install the Spectrum SE ROMs in both banks. That is:
worth buying a zx spectrumAs i have been watching Micro Men i have been really thinking about buying another Spectrum. Now as i grew up in the 80's and was a massive speccy fa…
[QUOTE=ingo;389597]Which special bug do you mean?[/QUOTE]
Reading from 0x7ffd writes the floating bus value to the port, normally resulting in a crash: e.g.
PRINT IN 32765.
Crashes the 128 or grey +2.worth buying a zx spectrumAs i have been watching Micro Men i have been really thinking about buying another Spectrum. Now as i grew up in the 80's and was a massive speccy fa…
... writes the floating bus value to the port, normally resulting in a crash ... : e.g.
PRINT IN 32765.
Crashes the ...Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …
... out when you reach point C (end of INK/PAPER rasterisation ... , and then repeatedly read the floating bus until that value is detected ... work on anything without a floating bus, obviously :-)Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …
... ve read a bit about floating bus and I'm confused:
bus, which will be a ... , then attributes bytes, like in spectrum memory or are they ... I guess scanning this port in loop for value FF to ... a lot of FF bytes in my graphics display which ...speccy hardware differences?yup, ive escaped from chit chat for a second ive been reading the last issue of retro gamer and theres an article on the commodes sid chip it was s…
... 48K machines handled the keyboard in a slightly different way; this ... famous of which is the "floating bus", which is what causes Arkanoid ...Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... your memory copy routine, so in the last screen third you ... . Previous trick are using the floating bus (not compatible with all Spectrum ... ), and waiting for the interrupt. In the later case, what is ... 't copy the whole lot in one go to the display ...C Programming question*bangs head* So not a c programmer. I know bitshifts are << and >> But what does <<= mean? I'm trying to work out an algorithm to implement in z…
They're shortcuts. What it's saying is 'var = var
