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How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
It is contended. It's on the main low 16K RAM chip, so it is contented. The ULA will always have priority when dealing with such memory, so potential reads and writes may be delayed. -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
[QUOTE=na_th_an;623188]It is contended. It's on the main ... priority when dealing with such memory, so potential reads and writes ... of higher up in the memory.[/QUOTE]
Another mistake ... -
Spectrum30 Show in Cambridge, 08th-09th September 2012Hello Spectrum-fans, after many months of preparation we now proudly present what will be the biggest Spectrum venue of the last 20 years. We manage…
... once you run into the contended cycles it all lines up ... the plus side the memory isn't contended, but on the downside ... -
Spectrum30 Show in Cambridge, 08th-09th September 2012Hello Spectrum-fans, after many months of preparation we now proudly present what will be the biggest Spectrum venue of the last 20 years. We manage…
... the plus side the memory isn't contended, but on the downside ... -
PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)
... ' are merely spectrums with more memory and a disk system attached ... attribute based screen layout, the contended ram, etc.
My ... -
OpenSE BASIC 3.1.1The eagle-eyed will have noticed that [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0027510"]SE BASIC[/url] got an update last week. As a te…
... to support SE BASIC in ZXDS?[/quote]
Doesn't ... ZXDS already support IF2 ROMs?
< ... , use OUT commands to page memory, and use the MOVE command ... -
OpenSE BASIC 3.1.1The eagle-eyed will have noticed that [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0027510"]SE BASIC[/url] got an update last week. As a te…
... />
Doesn't ZXDS already support IF2 ROMs?
memory, and use the MOVE command ... cannot use alternate ROMs with ZXDS (unless I misunderstood Patrik when ... -
ZXDS 1.0.0Hello, new [URL="http://zxds.raxoft.cz/"]ZXDS release[/URL] is out of the door. Now ZXDS has all the features I have only dreamed about 5 years ago,…
... emulator, I must report that zxds now works almost perfectly with ... problem reading files from the memory card.
The trick is ... appropriate memory card for the GBA slot 2 and then zxds automatically ... -
How much memory on sprites, maps etc.I've been tinkering with shifting & pre-shifting sprites recently, but as I haven't had that much experience with Z80 assembly I sometimes find it ha…
... 've not tended to allocate memory beforehand, this results in my ... the entire uncontended memory (tiny game engine in contended). Mind you these ... -
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…
... /> Velesoft's GAL corrects the contended I/O and wrong contention ... same as earlier ULAs. The memory paging etc. is handled off ... -
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…
... ]Velesoft's GAL corrects the contended I/O and wrong contention ... same as earlier ULAs. The memory paging etc. is handled off ... -
Coding for 128kHi all, I wonder if anyone can suggest any useful reading/threads/examples on the fundamentals of 128k coding. Chapter 24 of the +2 manual has prov…
... the 4 x 16k uncontended memory banks from 0-65535.
memory in bank 7 is a ... routine can be placed in contended page as ay handler most ... -
Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …
... 280ns cycle, and a memory read is generally longer ... of time with the memory signals set to read ... Z80's irregular pattern of memory reads. For example, ... going to achieve non-contended video memory. I still plan on ... to have dual ported memory so the problem kind ... -
Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …
... you for the wonderful emulator ZXDS, I sometimes use them.[/QUOTE ... . the price tag for the memory available.
[QUOTE]" ... I never heard of 'Transparent' memory access for Z80.[/QUOTE]
memory as if each was the ... -
Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …
... -multiplexed the CPU/ULA memory accesses to the contended banks, reserving one ... -
How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…
... in place of the upper memory DRAM's, a CPLD or ... may be able to have contended (screen) memory internally, otherwise you will ... -
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…
... the Sinclair machines when neither memory or port I/O is ... range of $4000-$7FFF are contended, or just the even numbered ... -
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…
... the Sinclair machines when neither memory or port I/O is ... range of $4000-$7FFF are contended, or just the even numbered ... -
Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…
... a 128, checks which memory blocks are contended, then loads each 16K ... chunk into a designated bank of memory ... block in the middle of memory. -
Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…
... .
But the most memory-efficient is to have the ... sprites at the top of memory, and only ever write to ... screen at the bottom of memory. But then you can't ... you're working outside the contended screen time you can use ... -
Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…
... /+3?
There's more memory available at one time, as ... to at the bottom of memory is contended. You still only get ... -
Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…
... to test which are the contended banks. So it would probably ... decompressing it straight into a memory bank. I won't be ... -
Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…
... figured out that because this memory is contended, it was fairly futile ... -
Timing in loading routinesJust for curiosity I have done some experiments with SAVE command in accurate emulators, and then analyzing the generated WAV and I have obtained lit…
... figured out that because this memory is contended, it was fairly futile ... routine to work in contention memory. Exactly in a +2A when ... -
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…
... time from the last memory access before pulling RAS ...
The picture shows a contended write to port FF3Bh. Cycle ... T1 is not contended, but cycle T2 is, ... /O ports must be contended, as there's no ... about to start a video memory read. During that time, ... -
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…
... time from the last memory access before pulling RAS ... about to start a video memory read. During that time ... be a fourth option: contended even I/O ports ... port accesses are not contended, as far as possible ... />
Even if contended, IN FFh could be emulated ...
