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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…
... handling for IO where a contended memory bank is paged in at ... have the first T-state contended (eg 0x7ffd).
... between 0xc000 and 0xffff are contended iff the page mapped at ... address 0xc000 is contended.
[quote]The 0x7ffd ... -
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 little ... the last listened value into memory will have to deal with ... -
Justin Beeper - new demo for the unexpanded 16K Speccy[img]http://pouet.net/screenshots/57726.png[/img] This was my entry for this weekend's [url=http://www.sunrisedemoparty.co.uk/]Sunrise[/url] demo pa…
... achieve all of that in contended memory alone.
[QUOTE]
The ... -
Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…
... need a special ROM for memory testing. I don't ... RAM is in contended or non contended area is to ... the fault is in non contended memory (and you will have ... POKE's to determine which memory chip(s) are damaged ... then the fault is in contended RAM, and the special ... -
Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…
... ,4 and 0 in non-contended memory doesn't behave as expected ... -
Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…
I cannot tell you from memory, but if IC6-IC13 belong to contended memory, then yes, you can boot your Spectrum in 48K mode (with the trick I explained before).
And no, you don't need to remove any extra capacitor. -
Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... usual suspect is the contended RAM bank, but there ... DRAM chip in the non-contended bank).
contended bank is failing.
memory with value 00100010b (34 ... a byte from the contended memory bank is stored in ... -
SP1 and memoryWhile developing my program, I've run into memory related issues and haven't (yet) run into any advice over how SP1 uses memory. The examples all sb…
... impact from having it in contended memory ...yet - but quite a lot ... -
Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…
[QUOTE=mcleod_ideafix;568788]I cannot tell you from memory, but if IC6-IC13 belong to contended memory, then yes...[/QUOTE]
Sorry! I meant: NON contended memory. -
Z80 Cross-assemblersI need to build some code which contains sets of routines which run at one address but are stored elsewhere. Unfortunately, neither of the assembler…
... it in and out of contended memory on the 128K machines. At ... routines in the same shared memory space, all with multiple entry ... and run the routine in contended memory. It's not an ideal ... -
Z80 Cross-assemblersI need to build some code which contains sets of routines which run at one address but are stored elsewhere. Unfortunately, neither of the assembler…
... it in and out of contended memory on the 128K machines. At ... routines in the same shared memory space, all with multiple entry ... and run the routine in contended memory. It's not an ideal ... -
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…
... test: what happens with memory? I write a quick ... running in contended memory, writting to contended memory (or at least, contended in the ... we calculated for a non contended behaviour.
... complete bus cycle of this memory, which is being accessed ... -
ANN: Tipshop updated Saturday, 31 December 2011Saturday 31 December 2011 The last update of the year - Happy New Year when it comes! * GoodBoy sent in a cheat for Wacky Races. * Hippy Smith sen…
... relocating the game out of contended memory - nothing more, nothing less. Think ... />
;move us out of contended memory
reloc:
LD HL ... -
Would anyone be interested in......Hi, I'm wondering if there would be much interest in an expansion card for the speccy that gives a VGA output with enhanced gfx & sound capabilities…
... , which would have its own memory, its own powerful CPU and ... be applauded and supported. If memory serves me right there was ... did velesoft bother redesigning the contended memory layout on the +2 to ... -
AY-interface for ZX81 (at last ;) )Hi, it exists finally ;) - compatible with the most standard one - ZonX. [url]http://www.sellmyretro.com/offer/details/Brand_New_Sinclair_ZX81_MrX_A…
... are usually placed in non-contended memory. I don't know a ... if it even has non-contended memory!
Edit: Since the ... store an entire sample in memory. Gasman's WAV player for ... -
AY-interface for ZX81 (at last ;) )Hi, it exists finally ;) - compatible with the most standard one - ZonX. [url]http://www.sellmyretro.com/offer/details/Brand_New_Sinclair_ZX81_MrX_A…
... are usually placed in non-contended memory. I don't know a ... if it even has non-contended memory!
Edit: Since the ... store an entire sample in memory. Gasman's WAV player for ... -
Ultimate Collected Works, no Underwulde, why?I managed to get my grubby paws on the "Ultimate Play The Game" "The Collected Works" off E-bay.... The set has 1. JetPac 2. Pssst 3. Tranz-AM 4. Co…
... timer count down, once in memory I did a byte by ... - that's still running in contended memory :razz: -
Precisely timed loops in assemblyI'm looking for a way to make my code stop until the raster has reached the lower screen border (right after having drawn the last pixel line). I und…
... it's not running in contended memory).
I take the ... do a repeated write into contended memory, counting between two interrupts, to ... -
Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …
... .
If not a memory problem, this could be an ... the CPU is reading/writing contended memory - if the generated CPU clock ... isn't properly contended it can cause hangs and ... -
RFC: Hardware Documentation ProjectI've noticed quite a few threads recently about missing schematics and suchlike. I've also been thinking about the low quality of some of the schemat…
... a RAM failure in non-contended area
[url]http ... -rom-version-to-diagnose-low-memory[/url]
...
SIMM replacement for lower memory:
[url]http://www.zxprojects ... misdiagnosed as having damaged non contended memory.
[url]http://www ... -
Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
... and the refresh mechanism, if contended memory is paged in.
contended ram was paged in, but ... -
New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…
... precise, thus SAVEing from a contended memory zone will make samples vary ... going to be written into memory, contention may apply. The LOAD ... -
New project: CargandoLeches. Ultraloads with ROMHi This project has started months ago, between decicoder, macleod and me. Uses the best modulation of k7zx (throwing shavings). But this ultraloa…
... precise, thus SAVEing from a contended memory zone will make samples vary ... going to be written into memory, contention may apply. The LOAD ... -
Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... pointing to an area in contended memory even when interrupts are ... ULA fails to read from contended memory, leading to the odd ... that any code executed in contended memory will (sooner or later) ... Your routines can be in contended memory without problem, as long ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... address you want (even inside contended memory):
POKE 64954,INT ... -
Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... previous releases page in a contended memory bank while I contains $F1 ... $C0 and $FF, AND a contended page is set in $C000 ... -
Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... IM2 vector table in slow memory area (16384-32767 and slow ... ) is set to this slow (contended) memory, ZX is very unstable and ... I (IM2 table) to fast memory (or ROM). Exit fixed versions ... -
Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…
... previous releases page in a contended memory bank while I contains $F1 ... $C0 and $FF, AND a contended page is set in $C000 ... -
ULA snowHow is this feature implemented in emulators ? And how exact is the emulation ? I somehow supposed that ULA snow is something that is not very determ…
I shouldn't point to contended memory, even whilst interrupts are disabled. ...
