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Returning zx spectrum +3 owner - a few questionsHi everyone I'm a returning +3 owner, my spectrum has been dug out of the loft, not used since 1998. My setup was a +3 with a multiface 3 and a e…
... used to provide a replacement port?
[quote ... run those. I've been reading up on these new fangled ... -
IN and OUT in hardware terms... what are 'ports'?Hi all, I understand PEEK and POKE, but have never managed to get my head around IN and OUT. The books all go on about how they read from and wri…
... ).
The ULA port does have one extra subtlety ... Usually, you’d read from port $7ffe (01111111 11111110) for ... not the exact row. Similarly, port $0ffe (00001111 11111110) tells you ... when talking about them. When reading from the ULA, where the ... -
IN and OUT in hardware terms... what are 'ports'?Hi all, I understand PEEK and POKE, but have never managed to get my head around IN and OUT. The books all go on about how they read from and wri…
... responding slower than memory so reading or writing to them has ... because a read from that port might return unrelated information.
Understanding the Kempston joystick circuitHere is the schematics: http://www.retroisle.com/sinclair/zxspectrum/Technical/Hardware/KempstonJoystickInterface-Schematics.php Ok, the 74LS138N …
... to read the I/O port address, pin 15 is logic ... CPU reads the I/O port address, pin 15 goes to ... . However if the ULA is reading the screen data, the screen ...Bomb Munchies - preview releaseBomb Munchies Preview release Version 12th Jan 2014 [URL=http://s979.photobucket.com/user/MatGubbins/media/bmsix_zpsc33279a2.gif.html][IMG]http://i…
... pad and free USB port then add another pad ... on Kempston 31, proper reading values on Kempston 55 ... Kempston 31
proper reading values on Kempston 31, alternating ... line 20 (to read port 55) and still no ... Woody for including K55 reading into SpecEmu.
...No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…
... compatibility with machine code programs (port $fe problems, memory corruption if ... between the frame interrupt and reading of the top-left bunch ...Spectrum Music and/or SFX needed for New GameI decided to participate in the ZX-DEV-2015 game contest. http://zx-dev-2015.proboards.com/board/10/general-compo-informaci-sobre-concurso Here i…
... /> ...
Could you make a port-test?
like ask the ... you can't!
Reading ports, can have side effects ... /> Detecting a change in a port, doesn't really tell you ... the possibility of reading trash/noise data, when reading a port for which ...NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…
... CPU reads an I/O port address that does not have ... , upper RAM, expansion port]. If the ULA is reading data from the ... the ULA happened to be reading from the lower memory for ...NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…
... example), is looping and reading an IO port that doesn't have ...Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…
... allow changing palette registers while reading the graphics buffer makes me ... The same with the border port: it recognizes writes to the ... listen to changes on memory, port $FE and palette registers, and ... games and utilities that alter port $FE and screen memory ...Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…
... SRAM doesn't) to allow reading from those two addresses nearly ... time for the pixels and port $FE.
Hope I ...Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…
... SRAM doesn't) to allow reading from those two addresses nearly ... time for the pixels and port $FE.[/quote]
We ... screen buffer and writes to port $FE), which would be attended ... writes to bit 3 of port $7FFD), which are only attended ...Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
crux92 work in 48k mode
StarDragon use reading from port #FFDefinitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
Is there any easy way how to fix it? (reading from port #FF)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…
... found at 0x7ffd (32765), reading from this port will cause an unmodified ...Knight Lore disassemblyHi, Not quite sure if this belongs here or in "Games" but figured it's more likely that developers would be interested. I've just released the …
... A8-A15 address lines for port 254 reading (A register contents are ...Knight Lore disassemblyHi, Not quite sure if this belongs here or in "Games" but figured it's more likely that developers would be interested. I've just released the …
... A8-A15 address lines for port 254 reading (A register contents are ... to OUTput the keyboard row port HSB to #FD first in ...Interface 1 - RS232 question.I am thinking about doing some Spectrum stuff based around the RS232 port used on the Interface 1. Has anyone had any joy doing this with an emulator…
... />
I use libspectrum for reading in snapshots, so can handle ... , using the built-in RS232 port on those models. The Spectrum ...Knight Lore disassemblyHi, Not quite sure if this belongs here or in "Games" but figured it's more likely that developers would be interested. I've just released the …
... my next task, to port it to the TRS-80 ... the (homebrew) Atari 800 port of Knight Lore? Or the ... official BBC Micro port? They might have some ... Micro version (Atari 800 port is based on it). ... sprite sorting after reading about your C port of Knight Lore ...Opus DiscoveryWould anyone have any materials about programming the Opus Discovery disk? I know it overrides ROM and uses microdrive commands, but I am more into b…
... /> 4. The minimum speed for reading bytes from the Data reg ... is a PIA, of which port A (#3000) is programmed as ...Emulator developmentHi, Could anyone explain or direct to a link that explains in not to technical terms how an emulator is developed. It has always blown my mind eve…
... .
Then you loop, reading a byte from the array ... an OUT to a ULA port's speaker bit.
port contention, unhandled port reads, all that sort ...New game: SETO TAISHO VS YOKAIHello Spec-chums! At last, my new game is available for download: [img]http://www.alessandrogrussu.it/zx/Seto-art.jpg[/img] [b]Features:[/b]…
... D4. If software read joystick port after interrupt (border time) ... , because D5 of joystick port = log.1 then D5 ... start game if joystick port return all 7 data ... A,(#1F) ;read kempston joy port
AND #E0 ; ... then can be used reading joy port without AND xx and ...Character Based SpritesHi, I'm working through Jonathan's excellent guide to writing games, and have mastered the animation of single UDGs. Before or move onto Pixel…
I just went and started reading first chapter, and from what ... )
- Border and Speaker (ULA Port)
- Keyboard ( a set of ... row)
- Kempston ( an external port #1F = 31 decimal)
Enterprise 128Hello, has anyone come across any entry level tutorials on z80 assembler specific to the Enterprise machines in English. I found some Hungarian stuf…
... , the Enterprise had a parallel port... @-) )
But really back on ... Enterprise computer would be interesting. Reading the Wikipedia entry, it hints ...Enterprise 128Hello, has anyone come across any entry level tutorials on z80 assembler specific to the Enterprise machines in English. I found some Hungarian stuf…
... , the Enterprise had a parallel port... @-) )
But really back on ... Enterprise computer would be interesting. Reading the Wikipedia entry, it hints ... the attribute bytes, and FEh port writes and reads should be ...Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... 7) Parallel port as input device.
When reading data into the ... parallel port , the ready ... is empty then the port is set ready to ... valid character then the port is set busy. Note ... no effect on the port when it is used ...Can you run the same program on a Speccy and Amstrad CPC ?Both of these machines are Z80 based and I know many Amstrad CPC games were straight ports of the Speccy. Some of the CPC games I seen on YouTube loo…
... , do what is done with port like R-Type - where the ... accommodate the different method for reading/writing to tape and the ...Best place to start learning assembly on WOS ?So I'm pretty new at this forum but not the Speccy so my BASIC is pretty good. I can see lots of resources on WOS for doing machine code/assembly but…
... 32765 (128k memory paging port) / 65533 (AY register port) (***) / 16384 (start of ... to you and the person reading your code.
You ...Control methods to support in new game (kempston, sinclair, redefinable keys etc)Hi guys, I've been busy lately working on porting a game from the C64 to the Spectrum, and I'm at the point where the main game is working pretty …
... read of an I/O port where there is no device ... value that the ULA is reading from the screen memory as ... the port during the time when the ULA is not reading screen ...
