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The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... loading on the control line /ROMCS, and the response time of ... -
P.O.W.As far as I know, a port of P.O.W. (Prisoners of War) from NHK, doesn't exist. [img]https://cld.pt/dl/download/61d19b5e-453b-489c-b17b-d3ed6fccd594/…
... difference in +2 versions regarding ROMCS line(s), they have two ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... mention, but [b][color="blue"]! ROMCS[/color][/b] is being floated ... />
Since [b][color="blue"]! ROMCS[/color][/b] has a pull ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... all force [b][color="blue"]!ROMCS[/color][/b] to VCC (5V ... a regular [b][color="blue"]!ROMCS[/color][/b] disable?
ROMCS disabling/hacking, to be able ... to use [b][color="blue"]!ROMCS[/color][/b] pin in a ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... />
If [b][color="blue"]!ROMCS[/color][/b] line detection is ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... other devices that drive the /ROMCS line, do so via a ... a transistor to actually drive /ROMCS to 5V.
There are ... the latch and so drives /ROMCS high so that the device ... transistor to pull up the /ROMCS, plus the time the Spectrum ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... are driving [b][color="blue"]!ROMCS[/color][/b] high.
< ... ) are driving [b][color="blue"]!ROMCS[/color][/b] high.
< ... to disabled [b][color="blue"]!ROMCS[/color][/b] detection, once we ... control of [b][color="blue"]!ROMCS[/color][/b] line.
< ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... to check [b][color="blue"]!ROMCS[/color][/b], on first ROM ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... implement the detection feature on ROMCS, this could be done, ... , to take control of ROMCS line (something like DIV ... normally, but fake a ROMCS active as seen from ... but not disturb the ZX ROMCS line, when pin is ... The problem here is that ROMCS is like a master ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... might also work, to fool ROMCS line sensing, if a diode ... placed between CPLD and ZX ROMCS line. The idea is ... line normally, but fake a ROMCS active as seen from cartridge ... but not disturb the ZX ROMCS line, when pin is inserted ... to be able to control ROMCS line. -
P.O.W.As far as I know, a port of P.O.W. (Prisoners of War) from NHK, doesn't exist. [img]https://cld.pt/dl/download/61d19b5e-453b-489c-b17b-d3ed6fccd594/…
... ZX expansions that control ZX ROMCS line, but it's complex ... since ROMCS was never designed to be ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... now, it just proves that ROMCS control is fast enough to ... -
Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... line. When held high the ROMCS line B25 , disables the Spectrum ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... better alternative, is to develop !ROMCS sensing mechanism, that I mentioned ... device was taking over the !ROMCS line, and hence NOXROM ... simple hardware pull-up on !ROMCS line, could be built ... flash write protocol relation with !ROMCS line, which need re- ... -
ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
Having a working !ROMCS sensing mechanism, will allow a ... , that will signal a fake ROMCS input after a long RESET ... force an input/output pin (!ROMCS) high after a while, from ... -
Disable IF1 with switchOk probably silly question time but if you don't ask you'll never know, I have the JS128 which is great and has a jumper on the board to disable the …
... breaking the contact on 25b ROMCS can it really be as ... -
Disable IF1 with switchOk probably silly question time but if you don't ask you'll never know, I have the JS128 which is great and has a jumper on the board to disable the …
... can't remember if holding/ROMCS high will prevent this or ... -
INTERFACE 2 - light versionSmall interface (adapter) compatible with INTERFACE 2. Contain only slot for IF2 cartridges and reset button (for rubber speccy). Not contain joystic…
... />
No. Use only classic ROMCS then is unusable with +2A ... -
Quick questionHello, can someone tell me what the screen looks like when you power a 48k spectrum that has no ROM chip installed ? Thank you. François
... control[/u][/b]
/ROMCS comes from the ULA (pin ... -
Testing an Interface 1As title, is there an easy way on how can I test to see if its functional or not please ? :) Please bear in mind I do not have *any* microdrives n…
... going to work because the /ROMCS signal is not present at ... -
Testing an Interface 1As title, is there an easy way on how can I test to see if its functional or not please ? :) Please bear in mind I do not have *any* microdrives n…
... going to work because the /ROMCS signal is not present at ... -
ZX Interface 1Hi, I have a ZX Interface 1 which I have bought online. It does not seem to work. When using CAT1 or any other specific commands, the compute…
... the shadow ROM is active, ROMCS should be held at +5V ... active all this time. But ROMCS is 0V all the time ... -
ZX Interface 1Hi, I have a ZX Interface 1 which I have bought online. It does not seem to work. When using CAT1 or any other specific commands, the compute…
... or an oscilloscope to see ROMCS change state.
[b ... -
Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…
... similar devices just wired the ROMCS signal to the +5V power ... -
12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…
... .
Also does the /ROMCS line go to the relevant ... -
More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…
... Passive backplane would cascade the ROMCS ) - Might have extra IO on ... -
Paging for 64Kb of Video Ram??? What is the best way to page this?Hi all, I'm just putting together a concept card for a "Loki" style of video card, which supports shadow ( so it fits a normal Speccy ) and also t…
... would be possible to assert ROMCS and have it readable too ... -
More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…
... 16K using the expansion bus /romcs signal. This is a problem ... -
Interface 1 ULAIs there a technical description of the functionality of the Interface 1 ULA, similar to the "The ZX Spectrum ULA" book? Specifically, what is the…
Is ROMCS an input and ROMEN the output? Looks like there's a diode OR arrangement to ensure that the downstream device (IF2) overrides the IF1, and I guess the ULA wants to monitor the state of the line for some reason.
