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Question of contentionI'm not desperate to go digging through technical descriptions in depth, but one thing bugs me about the Speccy's video contention model - and that's…
... about the Speccy's video contention model - and that's the ... /> And then there's the contention pattern where the memory is ... 16, so that means the contention pattern covers a run of ... -
Opus Discovery with a HarlequinHi all I am getting a Harlequin and the 128k toaster rack mod but I have an opus discovery and a spectrum +, the + is dead so going to use the cas…
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I am getting a Harlequin and the 128k toaster rack ... use the case for the harlequin to live in but does ... the discovery 1 with the harlequin?
Thanks -
Harlequin Rev GI have just got all the bits to build an Harlequin Rev G system and I went for a red solder mask board. I have fitted the 3 surface mount components…
... the bits to build an Harlequin Rev G system and I ... -
Harlequin 128k??Hi peeps... I've seen that you can do a 128k version of the Harlequin board. Is it just the standard board with different chips or is it a dif…
Hi peeps...
I've seen that you can do a 128k version of the Harlequin board.
Is it just the standard board with different chips or is it a different board all together?
Thanks -
Harlequin turbo mode ( 7 MHz )Hi, All. Sorry for my bad english. I make Harlequin mod - turbo mode ( CPU clock 7MHz ) for Harlequin. Could you be so kind to write your opin…
... br />
I make Harlequin mod - turbo mode ( CPU clock ... 7MHz ) for Harlequin.
Could you be so ... schematic.
I tested on Harlequin 128K.
[img ... ) is inverting CPUCLK , but Harlequin has different schematic : CLKB is ... -
Just speccy or harlequin ?Hi all, I just wondered, to fit on an original rubber key 48k spectrum, which one would you recommend ? Just speccy 128k or the harlequin 128k ? S…
Hi all,
I just wondered, to fit on an original rubber key 48k spectrum, which one would you recommend ?
Just speccy 128k or the harlequin 128k ?
Self assembly and soldering is no problem.
Greetings -
Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…
... 'm wanting to build a Harlequin. I've got a Rev ... .
Looking at this Harlequin schematic, it just screams out ... on the case for the Harlequin.
Thanks ... -
Upgrading Harlequin 48K to 128K?I noticed this upgrade PCB on ebay for upgrading the Harlequin to 128K: http://www.ebay.co.uk/itm/ZX-Spectrum-Harlequin-48K-to-128K-Upgrade-Addon-PC…
... on ebay for upgrading the Harlequin to 128K:
http://www ... .co.uk/itm/ZX-Spectrum-Harlequin-48K-to-128K-Upgrade-Addon ... -
Harlequin 48k and 128ki am redoing my harlequin 48 parts onto a new harlequin 128k bored only parts i can't swap are the rom, ram and will need an ay chip but seeing as th…
... parts onto a new harlequin 128k bored only parts i ... -
Harlequin 128K minor problems.....Hi All, I've just assembled my Harlequin 128K kit, I had initial problems with it that I traced to not having soldered all of the pins on a couple…
... /> I've just assembled my Harlequin 128K kit, I had initial ... -
Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…
... started assembling my Rev G Harlequin board over the weekend. Right ... -
Harlequin 48k and 128kHi all i have been putting together a harlequin 128k and have a few components assembled on the board including some sockets and today arrived the…
... have been putting together a harlequin 128k and have a few ... arrived the kit for my harlequin 48k so i will start ... -
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…
... my head around the memory contention issues of the various 128K ... what is the cause of contention for banks 1,3,4 ... downs due to this apparent contention issue. -
Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …
... reduce the effect of memory contention considerably. Possibly with the addition ... -
Harlequin 128 issue 1Bhello Superfo i have the Harlequin 128 issue 1B i have a question. when i connect interface one the Harlequin is not booting up if i force to work l…
hello Superfo i have the Harlequin 128 issue 1B i have ... i connect interface one the Harlequin is not booting up if ... -
Harlequin video problemsHi everyone at the forums, this is my first post here, so forgive me if I don't post this at the right place. I hope that you can help me. I buil…
... help me. I built a harlequin superfo two weeks ago. I ... -
Tape loading on harlequinHi guys As per other thread I have completed my harlequin 48k build and it's working really well, I have a super card and loaded all kinds and pla…
... thread I have completed my harlequin 48k build and it's ... hooked it up to the harlequin now things get interesting, I ... it's down to the harlequin tape circuit.
Anyone have ... -
Writing own emulator: Contention questionsHi! (I don't know if this message should be here or in Hardware) I'm trying to write my own emulator just for the sake of it, and I'm having pr…
... having problems understanding the memory contention in 48k, in instructions like ... is being used there for contention.
Thanks ... -
Harlequin G Video problem.Hi everyone! Last week I finished putting my Harlequin version G kit together. Nervously I tested it but it was only a partial succes. The keyboard…
... week I finished putting my Harlequin version G kit together. Nervously ... -
Harlequin G 48K - Keyboard failHello All, I built a Harlequin G 48K over the weekend and it appears to be running! Well with the exception that I can't get the keyboard to work!…
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I built a Harlequin G 48K over the weekend ... Spectrum's keyboard on the Harlequin and it fails.
Harlequin 128 Rev 2D with ZX Interface 1 RS232Hi, Does anyone have any experience of using serial interface on ZX Interface 1 plugged into a Harlequin 128. While microdrive works fine, i can't…
... Interface 1 plugged into a Harlequin 128. While microdrive works fine ... the same test on a Harlequin 128k Rev 2D produces no ...Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…
... demo to fail on the Harlequin 8-)
What ... to be a significant memory contention timing issue....
Anyway ... the timings displayed by the Harlequin are now [B]identical[/B ... before - all due to this contention issue.
Full ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
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[CODE]14336 IO Contention Starts
14337 -
14338 Memory Contention Starts
14339 First display ... experience memory contention.
The memory contention timing ... my shock when building the Harlequin ;-)
...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... the usual documented T-states (contention start at 14335) differ from ... zip"]this one[/URL] on Harlequin? It's quite time sensitive ... is contended by the memory contention!!)[/QUOTE]
Well, ... work you have done on Harlequin. I just think that there ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... ulatest3 being correct because the Harlequin [I]definitely[/I] reads ... the Wiki on the Harlequin and a Spectrum 48K ... .zip"]this one[/URL] on Harlequin? [/QUOTE]
I ... [QUOTE]"[I]IO contention is different from memory contention[/I] ......" Now this ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... .zip]fusetest[/url] on the Harlequin? That runs IN A,(FF ... "Fuse"'s model (specifically, memory contention at 14335).Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... .zip]fusetest[/url] on the Harlequin? That runs IN A,(FF ... "Fuse"'s model (specifically, memory contention at 14335).[/QUOTE]
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... difference between the emulators and Harlequin is not enough. The contended ... align correctly on the first contention and the rest is then ... course that it works on Harlequin, otherwise we would be in ... verify the 1T offset with Harlequin at hand, you might just ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... from the Harlequin blog, the smart thing about the IO contention is ...Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... .zip]fusetest[/url] on the Harlequin? That runs IN A,(FF ... "Fuse"'s model (specifically, memory contention at 14335).[/QUOTE]
contention Passes on the Harlequin, on Fuse 0 ...
