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Challenge Sprint 4x tape recorderHi, I noticed a [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000051"]Challenge Sprint[/url] on eBay, and checked out the WoS entry for it…
... have to deal with the ULA timming restrictions. As you will ... OUT's a 0 into port BFh. I think this unpages ... new "MIC" port, bit 7.
* FFh. Read-only. "EAR" port, bit 7 ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... understanding them. If the same port serves two purposes (it both ... confusing reading with writing. The ULA maintains the border colour and ... a byte value when you read an even port.
D ... -
Emulation of ZX Spectrum 128+2 (grey)Please read this thread: [url]http://www.worldofspectrum.org/forums/showthread.php?t=35523[/url] result: exist 3 (or more) versions of grey ZX Spect…
... adress of paging port and read floating bus (if ula show border then ... write to paging port value #FF and if ula read videodata, then write ... to paging port videodata).
CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…
... "specific" ;)
You can read some of his posts here ... which is what i thought ula snow was whereas that is ...
this is not a port that the speccy can control ...CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…
... "specific" ;)
You can read some of his posts here ... which is what i thought ula snow was whereas that is ...
this is not a port that the speccy can control ...CSS has been Rogeredcomp.sys.sinclair has just been rogered. I make do with a summary when anything happens and activity shot up on Friday. Turns out to be the usual qu…
... "specific" ;)
You can read some of his posts here ... which is what i thought ula snow was whereas that is ...
this is not a port that the speccy can control ...Create a new microdrive cartridge image formatHi there, I'm working to emulate the IF1+Microdrives in JSpeccy.I've found what the "classic" MDR format ins't capable to store all the required inf…
... not transparent to the IF1 ULA, you need to remove ... byte lasts 168 states to read/write, so the time ...
At read time, the GAP signal for 0xef port is the ... Moreover, is possible to read a 180 sectors MDR file ...
The easy way is read as MDR and convert to ...TR-DOS Gameplay Videos MegathreadA thread made mainly for your amusement for one evening. Yeah, it contains lots of videos of the games that have mainly been left without attention o…
... has a different ROM and ULA. It is almost 95-99 ... ,80,68,251,223 and read values from ports: 191,251 ... this ports ???
Only port 191 is used also in ...New interface for ZXThis is my old (2004) unfinished project of internal interface for ZX Spectrum 128+2: ([url]http://velesoft.speccy.cz/hardware_in_development.htm[/u…
... multicolors is designed for Pentagon ula and in ZX+2 is ... ULA with different screen timing, then ... contention on all ports(only port #FE is slow) and memory ... are readable - you can always read status of hardware setup, zx ...SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…
... to the internals of the ULA than the rest of the ... at ?T-resolution. For the ULA to behave correctly, it needs ... state machines for mem & port read/write).
[quote]As ...BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…
... speed) it grown fast. The ULA not generate a perfect square ... another frequency.
The ula itself is generating very sharp ... the electronics driving the MIC port act as a low pass ... again when the tape is read. Each response is going to ...pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…
... the matrix array (+2A's ULA) logic so it's not ... port is also read at the same time. If you disable the ULA ... when a read is made to port FEh, you ... end up with a deaf ULA :Dpc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…
... port is also read at the same time. If you disable the ULA ... when a read is made to port FEh, you ... end up with a deaf ULA :D[/QUOTE]
Good ...pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…
... (say, bypassed) a partially damaged ULA that way: display and RAM ... ear and speaker, lifted the ULA pins that control the keyboard ... the damaged suffered by this ULA caused all keyboard inputs to ... signal for driving a read operation from port $FE */
ENABLE ...Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... mode if a VRAM read operation is in curse. ... when [B]any[/B] read operation is in curse, including ... of course, I/O read operations: the very same I ... when VRAM is being read by the ULA, and that was ... . This small mistake prevented port FEh reads to succeed. ...Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... a few days ago I read that Antonio Villena's new ... remember it was something about port 254. :)[/quote]
More ... gates on the ULA. Unless he was using lazy port decoding of ... on the Timex the ULA is only on port #xxFE, not on ...Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …
... ULA. and i know, that disabling ULA when reading FE port ... input)?[/QUOTE]
Port FEh is used both for ... 't know if a read operation is looking for ... a good idea to disable ULA. Besides, IORQGE signal is ... drivers and cannot override ULA, it's going to ...SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]
... only time the SPECTRA can read and write to the SRAM ... core could be adapted for ULA plus with a re- ... of these or even a ULA plus version of it.[/ ... in in place of the ULA.[/QUOTE]
So ... 1 when accessing the IO port.
Therefore, SPECTRA ...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…
... way to tell if a read of the Spectrum's own ... is being performed by the ULA or the Z80...[/QUOTE]
ULA reads would not be. However ... of what's on the ULA's half of the ... wrote or read from an uncontended IO port during the ULA's screen ...Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…
... The ULA input port is 0xFE and when this is read the ... lines and reading the ULA keyboard inputs you can ... half row.
To read the whole keyboard you have ... to read the inputs eight times ... />
You can read multiple half-rows at once ...TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…
... (incompatible with Sinclair's ULA). This ULA has been cloned with CPLD ... machines when neither memory or port I/O is being ... timing of the first pixel read
[*] Whether attributes or ... of IN from an unattached port ('floating bus').
[*] Details ...The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... developers would either snoop on port 0x7ffd or rely upon M1 ... of the address space is read).
[QUOTE]Like it ... trickery here (as per the ULA side of the bus) such ...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…
... . For the ULA to know when a port is contended, ... the ULA is about to start a video memory read. ... almost all) ports, but leaving port FFh uncontended.
ULA, so a request to an odd port is ... without losing the attribute port. To support SpecDrum for ...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…
... data. For the ULA to know when a port is contended, it ... almost all) ports, but leaving port FFh uncontended.
The ... single four-byte page-mode read the ULA does two consecutive two ... so that odd I/O port accesses are not contended, as ...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…
... cockroach exists to fix a ULA bug, which is not ... DRAM row so a page read can be performed.
... altering the timing in the ULA+ to reduce IO contention, ... is important that the ULA reads video bytes at the ... (none of this dual-port nonsense!) this non-trivial ...Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…
... (I just can't read anything beyond really simple ones ... silicon chip and Ferranti ULA fabrication processes if you ... this in detailing the port I/O. I'll ... circumstances in which the 'ULA ROM' will be active. ... ever taken when the 'ULA ROM' is actually being ...Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…
... I'd recommend that you read [URL=http://www.zxdesign ... s book on the Spectrum ULA[/URL] if you're ... silicon chip and Ferranti ULA fabrication processes if you ... here, I should've read those sections in more detail ... mention this in detailing the port I/O. I'll ...Circumspect - A Spectrum Emulator for learningThis is a project that I have been playing around with for a while. It must be said, I tend to have problems getting things finished where hobbies a…
... equal to 0 when port 254 is read (nevertheless this behavior can ... equal to 1, when this port is read.
Moreover each ... behavior of bit 7 of port 254 and ROM could be ... , but if pin 1 of ULA was grounded, it can work ...Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…
... extended to use the AUX port as a 3rd input... ... Amstrad's keyboard and ULA ASIC which helped reduce ... similar. If the values read are stored, then XOR' ... d with the last set read, any '1' bits indicate ... inspection of the values read tell you whether it was ...
