-
ZX128/+2 unrainer (HAL10H8)[url]http://velesoft.speccy.cz/zx/umbrella/umbrella.htm[/url]
... eliminate raining effect and set port 7FFD as WRITE ONLY (read ... all ZX ports is not contended (all slow ports is faster ... functions:
READ ONLY port 7FFD - this feature disable read ... port 7FFD => ZX will not ... -
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.
... bus... passed
Contended memory... passed
High port contention 1... passed ... bus... passed
Contended memory... passed
High port contention 1... passed ... failed (0xff)
Contended memory... passed
High port contention 1... passed ... -
Skool Daze disassemblyWhile developing [url="http://pyskool.wordpress.com/"]Pyskool[/url], I've also been putting together a disassembly of Skool Daze and Back to Skool, m…
... it'll be fun to "port" them to Pyskool. I'd ... of the code engine in contended RAM. Even the UDG/screen ... back buffer is in contended RAM ($7F00).[/QUOTE]
Which ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... that using an odd numbered port isn't a problem.[/QUOTE ... memory, if the port to be used is already contended, it gets ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... memory.
The port is also contended anyway, because when the ... it's just another ULA port, with the same contention as ... the existing ULA port. Touching the RAS line to ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... , we need to get the port issue sorted - contention information (with ... 're using an even numbered port (which we should - this should ... will be vital. Even properly contended, palette changes are instant in ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... as A0 low means "ULA Port". However, additional lines can also ... is the existing ULA port, 3Ah the new port.
... access to the border colour port is contended, and the ink and ... entries are fetched during the contended period, the border colour load ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... fully specified[/quote]
The port number seems to need to ... ) will be values written on port interpreted in different way ? (high ... . Palette updates however will be contended.
5. Changes in the ... -
Resolution & Memory Question ...Hi, I'm hoping someone with some experience writing an emulator, or a vast knowledge of all things Spectrum can help me answer the following questio…
... 0x3FFF ROM
0x4000-0x7FFF (Contended) User RAM
0x8000-0xFFFF ... certain times. This is the 'contended memory'.
The remaining ... is controlled by an output port; the bottom 3 bits of ... a write to port 254.
The vagueness ... -
Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…
... . The Russian machines have no contended RAM to worry about. The ... pages are contended. The standard Pentagon doesn't use port #1ffd. You ... -
Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…
... .[/QUOTE]
Port 0x7FFD is itself contended, and horribly so. I ... -
Memory mapping: Pentagon compatibility?I'm writing something that will rely heavily on the Spectrum's ability to switch screen buffers in hardware (port 0x7FFD). The original Spectrum 128K…
[QUOTE=ajmoss;464692]Port 0x7FFD is itself contended, and horribly so. I only ... -
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... />
; *MUST EXECUTE IN NON-CONTENDED RAM*
; *CORRUPTS REGISTER 7 ... />
; Read bytes from AUX port.
; > HL ... -
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... port @ 57600 BAUD:
[code]
; *MUST EXECUTE IN NON-CONTENDED ... />
; Read bytes from AUX port.
; > HL ... Sinclair RS232C 9 way serial port adaptor (?10) and one two ... -
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... port @ 57600 BAUD:
[code]
; *MUST EXECUTE IN NON-CONTENDED ... />
; Write bytes to AUX port.
; > HL ... -
What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3
... GAL also disable reading from port 7FFD (ZX ignore reading ... /> - use better adressation of port #7FFD (same as on ZX128 ... operations are accelerated/fast/not contended (fast IN/OUT instructions)< ... but only port #7FFD is enable (port #1FFD not exist). Port #7FFD ... -
Other good oldschool computers?Hi! I'm a collector of games, and i looooooooove computers. I'm very much intrested in: -Amiga 500&1200 -Atari 8-bit -C64 -C16 -Spectrum -QL -CoCo -…
... . send the code via the port to the c64 :)
contended architecture that lowers its effective ... -
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... ? failed (0xff)
Contended memory? passed
High port contention 1? passed ... (B=0x01)
Contended memory? passed
High port contention 1? passed ... (0x00)
Contended memory? failed (0x02)
High port contention 1? passed ... -
contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
... />
- use better adressation of port #7FFD (same as on ZX128 ... +2A/+3)
- reading of port #7FFD is ignored (same as ... ]- I/O operations are not contended (fast IN/OUT instructions)[/B ... -
contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
... />
- use better adressation of port #7FFD (same as on ZX128 ... +2A/+3)
- reading of port #7FFD is ignored (same as ... ]- I/O operations are not contended (fast IN/OUT instructions)[/B ... -
contended memory...so memory contention on the toastrack and the grey +2 is in the wrong place compared to the documentation, yet the +2a/b and +3 it is in the correct …
... />
- use better adressation of port #7FFD (same as on ZX128 ... +2A/+3)
- reading of port #7FFD is ignored (same as ... ]- I/O operations are not contended (fast IN/OUT instructions)[/B ... -
enJine: a fast tilemap enginetile engine based on excellent work by Joffa Smifff. here you can download first tech demo. [url=http://ketmar.no-ip.org/tmp/enJine.tap]Get It Now![…
... that correctly does port #FF and timing (including contended memory) and on ... on machines without proper #FF port[/i]
it's a ... , engine itself doesn't care. port #FF used for crt ray ... -
128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…
... It checks whether writing to port 0x3ffd activates memory paging. ... partial
;; decoding of "port 0x7ffd"[/code]
... the 0x7ffd, 0x3ffd and 0xbffd port checks?[/quote]
Correct. Odd pages are contended on the 128, whatever the ... -
128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…
... It checks whether writing to port 0x3ffd activates memory paging. To ... partial
;; decoding of "port 0x7ffd"[/code][/quote]
contended.
[quote]The ... i]reading[/i] from that port induces memory paging on the ... -
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…
... , so it loads entirely into contended memory, which might cause a ... OUT's a 0 into port BFh. I think this unpages ... . It's the new "MIC" port, bit 7.
* FFh. Read ... -only. "EAR" port, bit 7. Decoded bit value ... -
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…
... port always #FF value. And why ? Adress 7FFD is slow (contended ... br />
Also "attribute port" 255 can return always value ... will use uncomplette adressation of port 7FFD:
IN 16381 ... videodata, then write to paging port videodata).
Last ... -
What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... ]Get some dual port ram and have nothing contended :D[/QUOTE]
contended and uncontended memory. You know ... -
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…
... contention on all ports(only port #FE is slow) and memory ... and 7(both videorams) are contended as on orig.ZX. All ...
