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Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…
Realistically it's one Z80 access to contended memory for every eight cycles during the display being drawn. -
Vectron borders on emulators, on a real spectrum ?Hi all, favor if anyone has time can someone load vectron on a real spectrum and when it finally loads on that screen the bottom right corner .. wher…
... you this information: a first contended cycle of 0x08 is early ... -
Brand new River Raid remake?one of my friend is trying to make a riverraid remake on flash just to have fun, I checked zx spectrum port of river raid. it is bad, really bad, jer…
... might as well use the LDI version. The PUSH one does ... -
Graphics mode:64x48x8 colors possible on Spectrum?That multicolor River Raid demo inspired me to make this question: If we filled all the screen with chessboard pattern [code] 00001111 00001111 00…
... be possible on clones without contended memory).
Incidentally, you ... -
River Raid Tech DemoJust a little something to look at. Enjoy. [URL="http://www.joefish.co.uk/speccy/Joefish_River_Raid_Tech_Demo_01.tap"]Joefish_River_Raid_Tech_Demo_…
... . They were designed for an LDI-based colour system that only ... -
Graphics mode:64x48x8 colors possible on Spectrum?That multicolor River Raid demo inspired me to make this question: If we filled all the screen with chessboard pattern [code] 00001111 00001111 00…
... be possible on clones without contended memory).
Incidentally, you ... -
48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…
... 't affected by I addressing contended memory at all. -
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…
... put the main routines in contended RAM and the text data ... in non-contended RAM. The scroll routine is ... -
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…
... of the code engine in contended RAM. Even the UDG/screen ... back buffer is in contended RAM ($7F00). -
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…
... of the code engine in contended RAM. Even the UDG/screen ... back buffer is in contended RAM ($7F00).[/QUOTE]
Which ... -
Skooldaze TooDear WoSsers, Thanks to Skoolkid's disassembly I'm attempting to write a new "improved" version called [B]Skooldaze Too[/B]. As part of the improvem…
... the sound code runs in contended RAM, but the +3 mode ... -
New BUZZSAW+ Demo, No.2OK everybody, here's the latest demo of [I]Buzzsaw[/I]. This includes the title screen I wrote in Corfu with control selection, some new sprites and…
... a 12x1 multicolour section using LDI that only changed the colour ... -
Hidden routine in loading screenAs discussed in another thread, the loading screen for [B]Back To Skool[/B] seems to have a hidden routine (in blue INK and PAPER). It would be inter…
... loading
-screen memory is contended (means slower and the way ... -
Hidden routine in loading screenAs discussed in another thread, the loading screen for [B]Back To Skool[/B] seems to have a hidden routine (in blue INK and PAPER). It would be inter…
... loading
-screen memory is contended (means slower and the way ... -
Colour clash on the Commode64?Was there any? Every now and again, I see a screen shot like this... [img]http://www.lemon64.com/games/screenshots/full/j/jack_the_nipper_02.gif[/i…
... -up', cycle wise - so that LDI was 4 t-states instead ... -
Colour clash on the Commode64?Was there any? Every now and again, I see a screen shot like this... [img]http://www.lemon64.com/games/screenshots/full/j/jack_the_nipper_02.gif[/i…
... -up', cycle wise - so that LDI was 4 t-states instead ... . There's no penalty on LDI, as that takes 16 states ... -
Colour clash on the Commode64?Was there any? Every now and again, I see a screen shot like this... [img]http://www.lemon64.com/games/screenshots/full/j/jack_the_nipper_02.gif[/i…
... . There's no penalty on LDI, as that takes 16 states ... -
Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …
... 30]
For the contended RAM (which shares time between ... /> allowed only 1 access to contended RAM in every 8 T ... -
Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…
... ever set I register in contended ram on an emulator, but ... -
AY interface - How many possibilities?Currently the newest AY interface available for sale gives 16K and 48K owners a chance to add AY sound to their Speccy, but (correct me if I'm wrong)…
... at all - it uses the (contended) clock signal on the edge ... -
AY interface - How many possibilities?Currently the newest AY interface available for sale gives 16K and 48K owners a chance to add AY sound to their Speccy, but (correct me if I'm wrong)…
... at all - it uses the (contended) clock signal on the edge ... the player is running within contended RAM because the effective clock ... -
AY interface - How many possibilities?Currently the newest AY interface available for sale gives 16K and 48K owners a chance to add AY sound to their Speccy, but (correct me if I'm wrong)…
... the player is running within contended RAM because the effective clock ... -
AY interface - How many possibilities?Currently the newest AY interface available for sale gives 16K and 48K owners a chance to add AY sound to their Speccy, but (correct me if I'm wrong)…
... after discovering that the external (contended) AY had a different clock ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... to be used is already contended, it gets rid of this ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... />
The port is also contended anyway, because when the CPU ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... 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.
... the border colour port is contended, and the ink and paper ... 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.
... . Palette updates however will be contended.
5. Changes in the ... -
More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.
... so when the CPU is contended anyway (pixel display update) seems ... -
SP and IM2 woesI have a function that writes the backbuffer to the screen using the method by which SP is stored, I "POP" a load of registers and then chnge SP to t…
I didn't know that, that explains everyting.
I will look into
a) Breaking halfway through (Good thinking)
b) Changing the function to not us SP (I only use it to set up the LDI values)
THanks