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Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…
... I/O ports would get contended) forming part of a very ... -
Toastrack/Grey +2 physical memory layoutI'm looking to extend the functionality of the test ROM used with Winston's diagnostic board to also properly test the RAM of toastrack and grey 128K…
... 0,2,4,8)
Contended IC6 to IC13 (Banks 1 ... . No indication of what's contended and what isn't, or ... what corresponds to contended/uncontended memory.
Could ... -
Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... cope with writing to ULA-contended memory of an external system ... -
New version Emulator ZEsarUX-1.0Hi I have uploaded a new version of my Spectrum/ZX80/ZX81 emulator. This is a major stable version, with real timing for all the models and with hi-…
... 2014 - Rainbow edition
Contended memory and real timing for ... of the Inves Spectrum +: no contended memory, snow in border, colour ... -
Pyskool 1.1.2Pyskool 1.1.2 has been released. Pyskool is a remake of Microsphere's Skool games written in Python and Pygame. It's designed to be very customisabl…
... produced by code running in contended memory). Hopefully you'll be ... -
New version emulator ZEsarUX-1.2Hi I have uploaded a new version of my ZX80/81/Spectrum emulator at [url]http://sourceforge.net/projects/zesarux/[/url] Changes are: Added emulat…
...
Added option to disable contended memory
Added fuller audio ... -
JHCon 2014Hello, not sure if this is the right category but JHCon 2014 will take place[B] from 28. to 30.11.[/B] at usual place - gymnasium in Jindrichuv Hrad…
... use special graphics modes of TC2048/2068 PAL ULA
--- add ... -
Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …
... /O addresses in the contended memory area) are issued ... TW, but memory is always contended in T1?
contended period has just begun, ... O bus cycle to a contended port (port $00FE ... at the start of contended area too would enlarge ... -
New 48K Spectum emulator on the Windows StoreHi, I've just uploaded a new "Free" Spectrum 48K emulator to the Windows Store, see: http://apps.microsoft.com/windows/en-gb/app/specwin48/4d54…
... /> I've read all about contended memory but as yet haven ... -
I feel they could have done this.After reading the ZX Spectrum ULA, I learned about how the ULA detects if the Z80 if going to access memory in the next cycle and stops it if the ULA…
... part of the memory is contended.
Alternatively, the ULA could ... -
[NEW] Retro Virtual Machine v1.0.0 for OSX released!!!!Here it is! Retro Virtual Machine v1.0.0 RELEASED!!!! Many thanks first to Patrik Rak for the PZX format and for their Z80 tests without which RVM…
... bus’
Emulation of the contended memory timings.
Pixel to ... -
No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…
Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum.
If I had a stock 48k Speccy and I could wave a magic wand to remove the memory contention, what software would break?
Would games still ... -
Shadow of the Unicorn loader for +2A / +3hi, i have tried to load SotU with the [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0023000"]RAM loader from Fraser Ross[/url], which is l…
... ram page #4 should be contended on the +2A/+3, to ... whether the WoS page about contended ram pages on +2A/+3 ... paged in at 0x0000, not contended on the real machine?
New version emulator ZEsarUX-4.0Hi I have uploaded a new version of my emulator ZEsarUX 4.0. You can download it from the project web page: http://sourceforge.net/projects/…
... Timex mode 512x192
Fixed contended memory timings on Spectrum 128k ...New Game - Cuboid CaptorWell, here it is, the (somewhat underwhelming) Cuboid Captor! This game was written for the ZX DEV 2015 competition and (to my knowledge) was the …
... and for good reason: the contended memory makes it sound like ...ZX Diagnostics v0.33 releasedHi everyone, I'm pleased to announce the release of v0.33 of zx-diagnostics. This release contains the following changes: - ULATest: Detect …
... +2A/+3 were also triggering contended fail notifications
- Bugfix: Memory ...Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…
... particular emulator doesn't handle contended memory correctly, but relative differences ...+2 Gray ProblemI'm trying to repair a +2 gray that behaves differently at every boot up. Some rare times I can get the selection window but pretty soon the characte…
... ? It must be on the contended RAM part since its causing ...ZX-Uno first impressionsZX-Uno first impressions Hello: I received my ZX-Uno last Saturday and I wanted to give everyone my first impressions of this latest ZX Spectru…
...
Keyboard
Timing
Contended RAM
DIVMMC
NMI ...help with broken +2 greyHello, the other day I was trying to record sounds from my grey +2 "sound" socket to an old cassette recorder. Suddenly the screen went to a solid…
... clock is also missing the "contended memory" pauses which I've ...Contended Memory, literallyDoes anyone else have the sort of memory where they have trouble just picking out info cold? I know we had a discussion about memory sometime last mo…
Does anyone else have the sort of memory where they have trouble just picking out info cold? I know we had a discussion about memory sometime last month, but...
For example, I like to think I'm a fairly competent developer, well the company ...Contended memory article on WikipediaYeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory [quote] However, the ULA must wait for a Z80 read or wr…
Yeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory
[quote] However, the ULA must wait for a Z80 read or write to complete before it can stop the Z80's clock and access the memory. As the ULA has no ...Timex Computer 2048 restoration projectHi All, I would like to share with you my restoration project of a broken TC2048. Make the story shorty it was my first computer in late eighties …
... /> [img]http://fotogalleria.info/pub/TC2048/TC2048_outside.jpg[/img]
Generally ... /> [img]http://fotogalleria.info/pub/TC2048/TC2048_01.jpg[/img]
[img]http://fotogalleria.info/pub/TC2048/TC2048_RAM_broken_traces_01.png[/img]
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…
... 6 as they aren't contended) along with all the needed ...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…
... ,3,5 and 7 are contended and that for models +2A ... ,5,6 and 7 are contended. I can see why banks ... 5 & 7 are contended as they relate to the ...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–…
... relocated the code to the contended memory (as was suggested by ...Fuse 1.5.4 releasedA new release of Fuse, the Free Unix Spectrum Emulator, is now available at the SourceForge project: https://sourceforge.net/projects/fuse-emulato…
Fuse for macOS 1.5.4 ReleasedA new version of Fuse for macOS has been released at the dedicated sourceforge project: https://sourceforge.net/projects/fuse-for-macosx/ Note …
... frequency (Fredrick Meunier).
[*] Fix TC2048 and TC2068 timings regression (Sergio ...Ay interfaces compatibility and/or differencesHmm, I have been looking for an AY interface to do an upgrade to a 48K machine. But, how many models are there now? And is there some compatibi…
... , say, the 48k and Timex TC2048 for example?
I ... Lotharek's is compatible with TC2048 but ByteDelights' apparently only works ...
