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Timing of Timex Computer 2068Is the timing of the Timex Computer 2068 fully documented yet? I have one here with the ZX Spectrum Emulator cartridge and have downloaded a few test…
... like the 6C001 ULAs. The contended memory timing seems to be ... quite different, not least because port FF is a fully decoded ... port on the Timex not a ... wondering how to test the contended I/O timing. Plenty of ... -
Writing to MIC portSo I had a new crazy idea: How about a stereo beeper engine? Since we can set bit 3 on port $fe to output to MIC, writing such an engine should be ra…
... can set bit 3 on port $fe to output to MIC ... -
Diodes placed the opposite way in +2A/+3 PCB'sI was just going to report this as a mistake in the schematics drawn by Guesser, but I saw a real board and realize that the schematics are right. […
... +5V.
As keyboard port addresses are formed assuming that ... the address bus for non contended RAM. I realize that it ... CPU address that addresses non contended RAM there is a unique ... -
+3 with dead expansion portI bought a +3 from a WoS user. So far, the computer works as expected, but when an interface (e.g. DivIDE (configured correctly) or Multiface3) is co…
... at all, so the expansion port seems to be completely dead ... -
Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…
... NMI menu. The Spectranet monitors port 254 for the border colour ... I/O ports would get contended) forming part of a very ... seeing odd numbered I/O port addresses. This was never fixed ... -
Quality of component video signals on 48K expansion portHi, What's the quality of the component video signals on the 48K Spectrum expansion port like? Could I directly connect them to three phono sockets…
... on the 48K Spectrum expansion port like?
Could I ... -
Modifying port number on M128.Got an MF128 and want to change the page port number from 9F to 5F... I know i would have to change A7 to A6, but to which chip? A bit esoteric I k…
Got an MF128 and want to change the page port number from 9F to 5F... I know i would have to change A7 to A6, but to which chip?
A bit esoteric I know, but any ideas gratefully received.
-Stacey -
Port $28FF. Why 28?Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putt…
Testing floating bus behaviour for ZXUno, I've found that both Cobra and Arkanoid use this specific 16-bit port: $28FF. What is so special about putting the value $28 in A15-A8 during a read to $FF?
Thank you very much in advance! :) -
New version Emulator ZEsarUX-1.0Hi I have uploaded a new version of my Spectrum/ZX80/ZX81 emulator. This is a major stable version, with real timing for all the models and with hi-…
... 2014 - Rainbow edition
Contended memory and real timing for ... of the Inves Spectrum +: no contended memory, snow in border, colour ... /81
Added idle bus port emulation
Added option to ... -
[port] Game About SquaresOriginal: [url]http://gameaboutsquares.com[/url] And a decent port: [url]http://speccy-live.untergrund.net/wp-content/uploads/2014/08/Squares.zip[/ur…
Original: [url]http://gameaboutsquares.com[/url]
And a decent port: [url]http://speccy-live.untergrund.net/wp-content/uploads/2014/08/Squares.zip[/url]
The game has AY music, nice kbd control (unlike the original) and undo feature. -
Sinclair PC 200 Error: Faulty SYSTEM serial portHi guys, this is my first post but not a happy one. I have bought 2 weeks ago an Sinclair PC200, when powerd up it shows the following message: "[B]E…
... : "[B]Error: Faulty SYSTEM serial port[/B]". Any one have an ... -
joystick port for output ?just curious regarding the joystick ports on 8 bit machines. I just purchased something on the atari 8 bit.. but included in the box was a atari 8 …
... ST end is a MIDI port.
so got me ... a modified joystick interface or port -
Zx spectrum +2a aux portCould some one help me I have just got my self a zx spectrum +2a I had too put a new belt on the cassette but on the moutherboard the aux port is bro…
... on the moutherboard the aux port is broken by the person ... -
Mystery Port on ZX Spectrum 48k +Hi, I was wondering if anyone could help me with a little mystery? After I tripped over my first 48k +, and knocked out the joystick expansion, I…
... , there was a silver phono port and a 'stick' type silver ... it was an RCA video port (especially since it was so ... anyone here know what the port was for? -
Strange keyboard port reads on 48+Hi all, I don't know whether it was already discussed (I also searched forum, but there are too much of results searching "48k keyboard" so I didn't…
... on 48k+ keyboard and read port EFFE (keys 6-0) I ... where is the program reading port as on some addresses it ... test program, which repeatedly reads port EFFE (on different addresses) and ... -
Contended memory and TritoneQuick question regarding contended memory...<div style="font-style: normal;"><br></div><div style="font-style: normal;">I'm testing ideas with Triton…
Quick question regarding contended memory...
I'm testing ... address and the data in contended memory, and it doesn't ... -
Original on ZX Spectrum - better port on other platformAlong similar lines as [url="http://www.worldofspectrum.org/forums/discussion/51238/clones-that-you-like-more-than-the-original"]this recent thread[/…
... ), but where you like a port of that game on another ... better? And of course: which port, and why?
I ... Spectrum version better than sloppy port to other platform). So this ... do a quick & dirty port). And perhaps added extra's ... -
Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…
... ) do have floating bus port. But it is not shown ... disabled (bit 5 of port 32765 set to 1), ... 0 set) if the port number has the following mask ... mean, starting from port 1, stepping 4, until port 4093
... does not have floating bus port, but it's incorrect.< ... -
Comparison of RS232 port on Interface 1 with that on Spectrum +3/+2AHi everyone, I'm writing a tool (in machine code) to transfer data (for example, an emulator snapshot) between a PC and a real ZX Spectrum, over t…
... with the built-in serial port on my +3. However, with ... />
Looking at the serial-port driver code in the Interface ... +3 code accesses the serial port via the AY-3-8912 ... suggestion for why the +3 port doesn't seem to be ... -
Kempston joystick - port MSB value?In a situation where let's say the kempston is being polled like this: LD BC,NN1F: IN A,(C), what is the 'correct' value of NN? 1. 00 2. FF 3. S…
... . This uses 00 as the port MSB and, well, isn't ... -
Poorly behaved PC serial port affecting RS232 communications on SpectrumHi everyone, I've been searching through the forum for information on the quirks of linking a ZX Spectrum RS232 serial port (e.g. ZX Interface 1 o…
... a ZX Spectrum RS232 serial port (e.g. ZX Interface 1 ... or even the built-in port on the later (128k) models ... serial ports - a built-in port and a USB serial adaptor ... . However, the built-in serial port is troublesome in a couple ... -
Which peripheral listened on port $9f from back in 1984 (Chuckie Egg related)Hi Apologies if this is in the wrong section, please feel free to move it to the correct one if so. I've been looking through the Chuckie Egg c…
... have been listening on that port. My gut feeling is that ... output a value on said port number. Further examination of the ... from 1984 that listened on port $9f or could it be ... -
Multi-platform hits that lack a Speccy port?Title says it all, really: Do you know any games that were a great hit, ported to several (or even many) platforms, but -for whatever reason- didn…
... Spectrum? Or where existing Spectrum port(s) are so bad compared ... -
Empire - port of trs80 basic programBack when I was a little kid, I had the opportunity to play around with a trs80 model 1 with level 2 basic. One of the games I often played was call…
... basic source and decided to port it over in C. Basic ... -
+2B, installing joystick to internal port (via Atari adapter) kills keyboard totallyHello all. I'm once more a speccy owner, after something like 30 years xD Anyway, bought 128+2b from ebay. Works fine, except for the built-in joyst…
... controllers with it's Kempston port and they worked just fine ... -
Arcade DERBY port....Pleeease ! [img]http://www.ukvac.com/forum/uploads/212/derby.jpg[/img] My spectrum did a fair job at recreating my trips to the seaside arcade …
... is one thrill that a port would never be able to ... -
Fastest way of reading from EAR portI'm trying to work out the fastest way of reading data from the EAR port and assembling the bits into a byte. I came up with this code: IN A, (C) ; …
... reading data from the EAR port and assembling the bits into ... :
IN A, (C) ; read port FFFE, 12 cycles
CP ... and 7 of the ULA port are always 1, so that ... -
Chibi Akumas - Spectrum Port Planned!I'm planning to port my CPC game, Chibi Akumas to the ZX Spectrum! I will be targeting the 128k disk based systems - as this will be the best (and mo…
I'm planning to port my CPC game, Chibi Akumas ... to be simultaneously trying to port to the game the MSX2 ...
