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Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …
... was able to simplify his Harlequin contention model.
Later on ... -
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…
Hi all!
The Harlequin ZX Spectrum clone now shows ... that will test the _memory_ contention
(or anything else for ... -
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…
... playing a bit with memory contention and floating bus stuff in ... sense it starts applying the contention a few cycles earlier, namely ... ="http://www.nfluid.com/specDesign/"]Harlequin blog[/URL].
[URL="http ... -
Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…
... a correct map for memory contention?
Address Size Area ... -
I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... .s faq describing I/O contention.
The 48k ... to lead to the following contention patterns:
High ... /> in 40 - 7F? | Low bit | Contention pattern
------------+---------+-------------------
No | Reset ... -
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…
... 0x7ffd, 0xbffd and 0x3ffd port contention behaviour.
... However, I find that contention is applied too often ... /> To correct the excessive contention, I replicated ULA14 and ULA15 ... someone describe accurately the contention behaviour for the 128K ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... and project notes from the Harlequin... a Speccy fan in the ... designed a PCB for the Harlequin! (The Harlequin as you probably remember ... ://trastero.speccy.org/cosas/JL/Harlequin/superfo1.html[/url]
Best current ide /flash interfaces? and re harlequin cloneHi I have a few 48k rubber-key spectrum's, a harlequin clone board :) on order and 1 (one) divide+ interface. I was hoping zetro's simple IDE woul…
... rubber-key spectrum's, a harlequin clone board :) on order and ... also fit / work on the harlequin clone? seeing as thats not ...BIT b,(ii+n) contentionThe documentation says that BIT b,(ii+n) has this contention pattern: pc+1:4,pc+2:3,pc+3:3,pc+3:1 x 2,ii+n:3,ii+n:1 See [url]http://scratchpad.wiki…
... b,(ii+n) has this contention pattern:
pc+1 ... Tstate.
So the contention pattern should be:
BAS-ROM for HarlequinSince it is very easy for everybody to plug a new BAS-ROM into his Harlequin there is the question, what kind of ROM and what additional functions sh…
... new BAS-ROM into his Harlequin there is the question, what ...A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …
Harlequin - usefull mods and addsHello, I start here a thread regarding mods and adds for the Harlequin. It was found: * that the Sinclair Interface 1 does not fully work at the Ha…
... mods and adds for the Harlequin.
It was found ... not fully work at the Harlequin.
* that the Beta Disk ... ) does not work at the Harlequin.
The reason is ... leads the -12V of the harlequin to the circuitry that needs ...populated Harlequin Rev.D -> Rev.FHi, I like to sell my Harlequin Rev. D board. I modified it to be identical to Rev. F: * switching regulator instead of linear regulator for DC in …
... /> I like to sell my Harlequin Rev. D board. I modified ...Harlequin case label concept?Hello everyone; I have been thinking about constructing a case for my Harlequin board. Nothing too outlandish; a sheet-metal case very close to the…
... constructing a case for my Harlequin board. Nothing too outlandish; a ... to have a Sinclair-style Harlequin label (in raised metal or ...Harlequin runningHi all, Just thought I'd post a wee pic of my Harlequin kit which I received yesterday and assembled in double quick time. A great piece of hardwar…
... a wee pic of my Harlequin kit which I received yesterday ... .com/images/stories/IanJ/ZXspectrummod/Harlequin.JPG[/IMG]Keyboard for ZX Spectrum 16k/48k or HarlequinThere is a keyboard developed originally for use with the Harlequin but maybe used as well with any 16k/48k ZX Spectrum. The keyboards offer a great …
... originally for use with the Harlequin but maybe used as well ...a harlequin keyboard option (+2a)Hi guys. Finally got around to this, I am using a keyboard from a +2a connected to my harlequin. [IMG]https://farm4.staticflickr.com/3932/1560029…
Hi guys.
Finally got around to this, I am using a keyboard from a +2a connected to my harlequin.
[IMG]https://farm4.staticflickr.com/3932/15600296661_323b6eee4d_k.jpg[/IMG]Harlequin keyboards / housingsI have about 20 or maybe more ZX Spectrum 48K's, which I'm planning to sell in separate parts (refurbished boards, ULA's and cases). Now I'm interes…
... /> Now I'm interested if Harlequin owners want a refurbished case ...important Harlequin modWhile searching for a better solution for avoiding undesired spikes that corrupt the screen RAM at Harlequin I found a final solution. No additional …
... corrupt the screen RAM at Harlequin I found a final solution ... realize these mods at every Harlequin PCB.
Greets Ingo ...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 …
I'm trying to understand contention and its implications when some ... both memory and I/O contention. Memory contention causes T1 to be ... ?
Also: memory contention makes T1 to be enlarged ... for instance, to avoid memory contention) that begins at the ...SuperFo Harlequin crashes on EnterHello there, I currently have a SuperFo Harlequin at hand which suffers a crash/freeze each time I try to enter a line in basic. Doesn't matter if …
... /> I currently have a SuperFo Harlequin at hand which suffers a ...So, where exactly can I buy a Harlequin?I've looked far and wide but cannot seem to find where to buy one of the Harlequin based "clones". Even an unpopulated motherboard would be a start.…
... to buy one of the Harlequin based "clones". Even an unpopulated ... an NTSC user...has the Harlequin had much success on this ...Superfo Harlequin Rev D Documentation wantedI have a Rev D Superfo Harlequin PCB. I would like the documentation (schematic and board layout files), but I get a [b]Not Found[/b] error when I cl…
... have a Rev D Superfo Harlequin PCB. I would like the ... ://trastero.speccy.org/cosas/JL/Harlequin/superfo1.html).
Does ...Harlequin Rev. G - error of labels at J16Hi, a German user found an error at Harlequin Rev.G board regarding the labels of J16. The labels of -5V and +12V are interchanged! That could be …
... user found an error at Harlequin Rev.G board regarding the ...Harlequin REV F to REV G upgradeHi guys i have a Harlequin REV F board and noticed its been updated to REV G with teh message of Error on J16 does anyone know what changes …
...
i have a Harlequin REV F board and noticed ... ://trastero.speccy.org/cosas/JL/Harlequin/superfo1.html
Thank ...Harlequin Rev. G - Composite video problem.What I'm about to describe I'm not experiencing it by myself, so the probable answer to any "have you tested this or that" question is no, I don't, b…
... />
They have built their Harlequin to specs, with correct face ... much better knowledge of the harlequin electronics has formed his opinion ...
