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Any other real Spectrum users in the USA?Hi, I bought a Spectrum +2a off e-bay (I collect old computers) and managed to make it run here in the US. I'm curious; is anybody else running an a…
... it's almost impossible to read. I modified one to output ... just for the RS-232 port, and I believe the +12 ... -
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... capable to open files for read/write in a floppy in ... in z88dk now. The ZXVGS port (Spectrum with Jarek Adamski's ... -
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... Frohwein for his GB-Z80 port.
;###
;## Decompress a ... /> exx
inc hl ; read the header self-modifying the ... -
Mnemonic HELPREFERENCE: [url="http://www.geocities.com/SiliconValley/Peaks/3938/z80_home.htm"]http://www.geocities.com/SiliconValley/Peaks/3938/z80_home.htm[/url…
... A ; preparre port 252
IN A,(252) ; read 252 (is it ... -
New CEZ GS game: COLUMNSFinally we've finished it!! After a long time coding, making graphics, musics and testing (as you could view in the forum if you know spanish -sorry-…
... are experiencing are probably the "ula snow" effect of the grey ... /> [/quote]
I have read about the "ula snow" but have not ... -
Some thoughts about emulationWhile discussing about 'real tape loaders' I just thinked about wat is total emulation (most complete, perfect). Some authors prefer for example loa…
... can "hear" through the EAR port - it can be a simple ... than emulating a simple z80/ULA combination.
You have ... exercise?
Highly accurate ULA/z80 interaction is needed to ... -
Externally emulating hardwareThere's been several threads onlong the lines of "can somebody add emulated hardware X to emulator Y"? What would be useful is if emulator writers c…
... could write and read your block and character port devices (e.g ... probably could treat the expansion port as a sort of parallel ... -
Speccy + issues?There was a topic somewhere regarding the different issues of the Spectrum keyboard and how it had some subtle effects on programs. Just wondering …
... difference is in version of ULA chip and some voltage levels ... is on same 8-bit port as keyboard scanning.
I ... it expects some values on port 254, and it came not ... -
Speccy + issues?There was a topic somewhere regarding the different issues of the Spectrum keyboard and how it had some subtle effects on programs. Just wondering …
... those (cobra) requires an invalid port read to return screen bytes, rather ... -
AdviceIf I connect a personal CD Player to my +2A to load Speccy games from the CD-R/CD-RW to the SOUND socket of the +2A, will anything happen to the comp…
Whereas use of the Expansion port to which the Kempston joystick ... mean unlikely) to damage the port itself and nothing else - a ... replace than a Z80 or ULA or any other critical piece ... could be damaged by Expansion port misuse. -
Whats the latest SPIN build?hey, just updating my emulators and i was wondering what was the latest build of SPIN? i think i have .505? is the problem with the fps slowing down…
... is at irc.astrolink.org port 6667. mIRC already has Astrolink ... /> If you download mIRC and read that intro, you should be ... -
Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..
... , i have another question about Ula timings..
after 14336 T ... .. this means that the ula is going to read this byte before ... -
Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..
... , i have another question about Ula timings..
after 14336 T ... .. this means that the ula is going to read this byte before ... -
putting images back on to tapeI`m hoping i can put the .tap images back on to tape if possable if so how can i do it and what programs do i need thanks
... that will read the games from the soundcard mic port or something ... -
128k, +2, +3ok i`ve asked a lot of questions over the few days but this is gonna be my final one on whats what unless i get lost once i get my apeccy so here goe…
... that if you read from a non-existing port (via an IN ... fixed it, the non-existing port returned 255, always. Any games ... -
128k, +2, +3ok i`ve asked a lot of questions over the few days but this is gonna be my final one on whats what unless i get lost once i get my apeccy so here goe…
... that if you read from a non-existing port (via an IN ... -
128k, +2, +3ok i`ve asked a lot of questions over the few days but this is gonna be my final one on whats what unless i get lost once i get my apeccy so here goe…
... that if you read from a non-existing port (via an IN ... -
ZX-PC InterfaceRight - i'm 34 and I cant take the pain of waiting for tapes to load any more - somethings gotta give ( either the tape deck or me ). I've seen a 'Z…
... the printer port uses, but we need a way to read signals ... -
questions about the +2 and +3I can`t remember if the +2 and +3 had a port on the back of the computer that let you use your own tape recorder so i`m asking if there was or not ?
... come I know about the ULA getting fried if you put ... /> +3 tape output is both read/write - needs a stereo 3 ... -
128k, +2, +3ok i`ve asked a lot of questions over the few days but this is gonna be my final one on whats what unless i get lost once i get my apeccy so here goe…
... ingenious resistor-decoupled z80 and ULA buses, luckily only very few ... /> As others who may have read my posts in the Emulators ... -
Spectrum Emulator for Windows XPHi all. I'm struggling to get any emulators to work with Windows XP. I'm just after an emulator with Joystick support. Any suggestions? Thanks
... UI for the Windows port.
I read also around here ... -
I, Ball 2Anyone else love this game as much as me? I used to play it a lot, despite never usually having much perseverence for platform-type games. It's one …
... ! All I did was read the IN port and save the vaules ... -
Dot CrawlHiya, I know this might seem like a stupid question but i`ve seen the term "dot crawl" used a lot on articles about older Spectrums. I wondered if so…
... on a standard Speccy, the ULA produces a composite out (you ... the picture.
I read an article about it years ... recollection of an article I read 20 years ago so may ... -
What is an "Unknown Port"?Port FF is unknown and so can return screen data on a 48k/128k/+2 models. But what if no Kempston mouse is plugged in. Is Port DF classified as unkno…
Woody calls them "unattached ports" - if there's not hardware attached then the port read will return floating bus on 48k/128k based machines.
D. -
What is an "Unknown Port"?Port FF is unknown and so can return screen data on a 48k/128k/+2 models. But what if no Kempston mouse is plugged in. Is Port DF classified as unkno…
On 48k/128k hardware (and +2) then a read from a port with no hardware attached returns a mixture of display/attr bytes and $FF, depending on what is on the bus at the time.
On +2a/+3/+3e hardware, it returns $FF every time.
D. -
What is an "Unknown Port"?Port FF is unknown and so can return screen data on a 48k/128k/+2 models. But what if no Kempston mouse is plugged in. Is Port DF classified as unkno…
... hardware is much easier. The ULA is assigned to line A0 ... address will do.
So, port 0xFF actually means that no ... -
What is an "Unknown Port"?Port FF is unknown and so can return screen data on a 48k/128k/+2 models. But what if no Kempston mouse is plugged in. Is Port DF classified as unkno…
... (and +2) then a read from a port with no hardware attached ... -
New Speccy Hardware IdeaHi All, With the growing trend towards consoles-in-a-joystick, I wondered what the likelihood of a speccy model being released? I also have a few i…
... on multiple forums, we do read all the forums.
port to a Spectrum?" will get ... you all like to see?" Read the forum archives first. Don ...
