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c64 .sid player coming soon to specy 128!!!c64 .sid player coming soon to specy 128!!! the first old version uses only square waves, 4 years ago: https://www.youtube.com/watch?v=6CKt9noxA7s…
... 1,3,5,7 are contended, on +2a/+3, banks 4 ... ,5,6,7 are contended. So I suppose +2a/+3 ... ram mode, and have more memory available.
@Woody
128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…
... just looked at the special memory modes for the +3.[/quote ... then ended up with different contended pages, apparently due to incorrect ... to just using the banked memory for storage and effectively redirect ... " to pull levels out of memory rather than tape.128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…
... be in the always-resident memory (the fixed 16k + the ... s not used for video memory). If I don't ... 5 and 7 both in memory and you swap them around ... 6 as they aren't contended) along with all the ... the +2 and +3, the contended bank distribution is different again ...128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…
... just looked at the special memory modes for the +3.[/quote ... then ended up with different contended pages, apparently due to incorrect ... disc drive and 64k of memory, you probably wanted to get ... , that will probably change the memory map completely (again). I * ...Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... can be avoided by using contended port for Kempston.
[/quote ... put there to detect attached memory banks. Reading an unattached port ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... are TWO physical groups of memory chips. Each group is ... One group is always non-contended, as the ULA has ... CPU access in ANY memory area in these RAM chips ... trying to access screen memory or any other area ... of which banks are contended compared to the later ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... the underlying reason for the memory contention.
After looking ... 6-13 which comprise the contended 64K group that you describe ...Reading Disks via ASMI'm hoping to port my Amstrad game to the spectrum (See the link in my sig for info) I will be targeting the 128 and +3 - the game will not work on …
... putting sprite data in the contended areas and program code in ... the non contended area -especially as my game ... loading (it was always in memory on 128k) - but this will ...ZXDS 1.3.4Hello, to celebrate the 35th Spectrum (and 10th ZXDS) anniversary, I have prepared [url="http://zxds.raxoft.cz/"]new ZXDS release[/url]. It fixes …
... worth getting one just for ZXDS :D[/quote]
Didn ... the memory of the previous generation.
Patrik - will ZXDS take ...ZXDS 1.3.4Hello, to celebrate the 35th Spectrum (and 10th ZXDS) anniversary, I have prepared [url="http://zxds.raxoft.cz/"]new ZXDS release[/url]. It fixes …
... worth getting one just for ZXDS :D[/quote]
The ... worth getting one just for ZXDS :D[/quote]
Didn ... the memory of the previous generation.
Patrik - will ZXDS take ...SORCERESS: new AGD gameFrom the creator of CYBERMANIA! I've written a new game, SORCERESS - an AGD maze shooter/adventure. It was quite an ordeal, as I ended up having to w…
... are different when played on ZXDS.[/quote]
The hearts were ... would have taken up more memory (which was getting very low ... again I ran out of memory!Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…
... everything is always FC, Fully Contended.
This means that ... requirement.
The memory is obviously tight too - less ... the screen memory. Luckily, since all RAM is contended anyway, then ... screen as extra scratchpad memory where you can away ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... these extra modes alter the memory structure in significant ways, it ... it switches the memory to use all the contended pages (4,5 ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... constantly points to cell in memory page N3, which is ... that effect of influence of memory operations to floating bus probably ... concerns "slow" memory pages, as ULA operated with ... 5 set (the normal screen, contended). It accounts for the currently ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... 's more about the newer memory test. It's fairly fast ... pass over all kinds of memory (ROM, contended, uncontended) but there's ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... the memory location pointed to by HL crosses a contended/noncontended memory boundary ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... to by HL crosses a contended/noncontended memory boundary?[/quote]#57 = (#55 ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... :
- Concerns just the contended parts of memory (it didn't trigger ... to by HL crosses a contended/noncontended memory boundary?[/quote]
Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…
... faults, take out a large memory range. So for example, ... screen RAM (all contended banks), or all memory above 32k (upper ... RAM) including any non-contended banks ... .
Run a memory test program to ...Troubleshooting my +2To put this in context: a while back (i.e. late last year and earlier this year) I was looking to put together a compilation of modern Spectrum games…
... faults, take out a large memory range. So for example, ... screen RAM (all contended banks), or all memory above 32k (upper ... RAM) including any non-contended banks ... .
Run a memory test program to ...The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... the I register when a contended RAM bank is paged in ... bank contains what inside paged memory would seem like an odd ... think they ran out of memory and opted for overwriting system ...Grey +2 with lines on some games on RGB connectionHi Everyone, Is it OK if I ask a question? I dug my +2 out of the loft after far too many years about a month ago, and I have finally got it ba…
... to address a particular memory problem in the contended 16kb range that ...+3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…
... ]
(That) all bits in contended
RAM failed. This can ... like I somehow cooked the memory .. or the gate array is ... />
If swapping out this memory fails to bring it back ...New Utility to Transfer Z80 Snapshot to +3 DiskSince getting a Gotek for my +3 it has been my go to machine. The biggest downside however is the lack of older games on disk format with pretty much…
... special mode makes the upper memory contended (banks 3 & 6 ... t care about the upper memory being contended.
... 4 : @16384-32751 user specified memory location
║ -fN: force ... to be
║ contended which may cause issues with ...Z80onDSK now compatible with +3e with ZXMMC or similarJust updated my utility to work on Spectrums equipped with +3e ROMs and IDE storage. I've tested this with ZXMMC at the moment but don't think there …
... )
║ -m: dump memory banks and full compression to ... ║ 4 : @16384-32751 user specified memory location
║ -fN: force ... in upper
║ memory for 16k games. Helps reduce ... to be
║ contended which may cause issues with ...
