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Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
[quote=gtsamour;229516]I still don't understand how come your eprom works without the 2 diodes and the resistor mod...[/quote]
It's actually pretty simple. I came up with the *same* solution, but implementing a logic OR-Gate in a chip. The ... -
Original Kempston interface on a +3Hello everyone, if i insert an original kempston interface in the extension port of a +3 should it work or not? I tried it and the machine didn't bo…
... on how you should assert ROMCS. The Kempston doesn't affect ... -
Original Kempston interface on a +3Hello everyone, if i insert an original kempston interface in the extension port of a +3 should it work or not? I tried it and the machine didn't bo…
... on how you should assert ROMCS. The Kempston doesn't affect ... -
Original Kempston interface on a +3Hello everyone, if i insert an original kempston interface in the extension port of a +3 should it work or not? I tried it and the machine didn't bo…
... some kind of connection to ROMCS. Unfortunately, I don't even ... -
sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …
... ) have to change to MREQ+ROMCS. With the two diodes and ... [/url]
Pin 27 (ROMCS). With last change, pin 27 ... -
Spectrum Ethernet update...in which a toastrack 128K machine prods a machine outside of my LAN for the first time. [url]http://spectrum.alioth.net/doc/index.php/Current_eve…
... , do you respect the input ROMCS from interfaces connected behind you ... memory for these interfaces (ie ROMCS is always asserted), this would ... -
Spectrum Ethernet update...in which a toastrack 128K machine prods a machine outside of my LAN for the first time. [url]http://spectrum.alioth.net/doc/index.php/Current_eve…
... , do you respect the input ROMCS from interfaces connected behind you ... -
BBC microI was often made aware by people at the time that the beeb was the "best computer in the world." Even my next-door neighbour ( who was a bit of a co…
... , and monitoring the through port ROMCS line because there's no ... -
Blown standard divideI recently bought a SIY divide kit from Papaya labs and after i soldered everything, it worked perfectly. I've used it 5-6 times without problems (Fa…
...and if ROMCS is stuck on when it ... in on reset, if the ROMCS transistor has failed closed circuit ... on the +3, the other ROMCS line is the same pin ... -
Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…
... /> What might be incorrect is ROMCS... I'lL check that later ... -
Running TZX off an IDE drive? Or streaming from a NAS?Hello. I know about the DivIDE project, and about the ZX Ethernet project, but not how far they've come or what they can do. So: 1. If I have a squ…
... , which functions a bit like ROMCS - you can hold it high ... the instruction fetch, it holds ROMCS high (which pages out the ... -
Interface 1 on TS2068 - Possible?After an e-mail from a gentleman on eBay I realized the TS2068 edge connector doesn't have one or more signals that the Interface 1 needs. The twiste…
... twister boards the Spectrum's /ROMCS signal is simulated using /BE ... -
DK-Tronics AY interface questionCan I use this interface to play 128K tunes on a 48K? [url]http://cgi.ebay.com/Sinclair-ZX-Spectrum-Three-Channel-Sound-Synthesiser_W0QQitemZ3701203…
... as those boards that fix ROMCS on a +3 to work ... -
Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…
... (U26 - CF RAM schematic) disable /ROMCS = disable internal ZX rom chip ... + A15=0 + MREQ=0), set ROMCS to log.1(disable internal ... internal ZXCF memory if signal ROMCS is disabled by external interface ... -
original DIVIDE and RESIDOSExist external interface with MB02 memory (512kB-1MB) memory. It's possible connect to ZX Spectrum before DIVIDE interface and used MB02 versions of …
... /> BATTERY
TRANSISTOR(for disable ROMCS)
If MB02 memory ... -
ultimate microdrive cassette?just a thought.. would it be possible to make a special microdrive cassette that would work as adapter and take sd cards. you know, like those mp3 ad…
... ) allows no easy control of ROMCS (the ROM is paged either ... -
Speccy +2 (Grey) peripheralsHello all, I have just bought a grey +2 to use as a workhouse whilst I keep my 128 toastrack for Sunday best. It hasn't arrived yet, however I was wo…
... drive). These machines have two ROMCS lines where all the previous ... ROM, it must hold both ROMCS lines otherwise bus collisions may ... jumper to enable the second ROMCS. On earlier machines, the pin ... used for the second ROMCS is a video output, so ... -
Rom upgrade(s) for the Humble spectrum +2 (not 2a or 2b)Hello there my fellow forum chummies, I was thinking today, after reading all this lovely rom burnery stuff, is there a way I could update the ROM o…
... connector has a pin called ROMCS which allows your peripheral to ... -
dead issue 6a boardI've just been back to the uk and found my old 48K + there - and bought it back with me to singapore - it's giving white border and red bars. From wh…
... a project board that pulls ROMCS the correct way is just ... -
Old peripherals on the Spectrum +2I have a Wafadrive and an Alphacom 32 (ZX Printer clone), neither of which work in 128 BASIC, but both of which work flawlessly when you run them in …
... ROMs, so you need two ROMCS signals if you want to ... or 48K with regards to ROMCS, but due to routing constraints ... -
Easy storage device.Hi all, I am fed up with unreliable tape / wav loading on my +2b so would really like another way of loading games. I know nothing at all about how …
... used on the 48K)
ROMCS deleted - pin no longer used ... not connected pin instead of ROMCS). The resulting collision on the ... -
winston's diagnostics boardHi Winston, I've recently built your diagnostics board on project board and am having huge problems getting it running. I've been pulling my hair ou…
... .5 which is exactly what ROMCS does when disconnected from the ... -
winston's diagnostics boardHi Winston, I've recently built your diagnostics board on project board and am having huge problems getting it running. I've been pulling my hair ou…
... drain is disconnected from the ROMCS line it gives a very ... -
RAM PagingCan anyone shed some light as to how RAM paging actually works, at a hardware level (so not POKE xxxxx stuff). I know about CE and OE lines on DRAMs …
... transistor that pulls up the ROMCS line on the edge connector ... -
Kempston Interface TroubleHow can I tell if my Kempston Joystick Interface is compatible with my Spectrum +2A? I tried it on my Spectrum +2 and it effectively "killed it". Is …
... ' lines on the expansion port (romcs).
/|\ if I am ... I see it uses the romcs, so I am avoid to ... -
+3 and IF1Can the IF1 be used with the +3
No. Electronically incompatible due to the +3's different ROMCS lines, and also the IF1 BASIC extensions won't work with +3 BASIC. -
Switching between +D and DivIDEI want to add a switch between +D and DivIDE. I think, soldering a switch between MEMRQ1 and MEMRQ2 + IOREQ1 and IOREQ2 of both Interfaces and Spectr…
... rom data). For correct fix: ROMCS from DIVIDE must go to ... -
Switching between +D and DivIDEI want to add a switch between +D and DivIDE. I think, soldering a switch between MEMRQ1 and MEMRQ2 + IOREQ1 and IOREQ2 of both Interfaces and Spectr…
... switched on (MREQ, IOREQ and ROMCS are switched to DivIDE). Maybe ... -
Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…
... 0x0000 and 0x3FFF by holding ROMCS high. The NVRAM on these ... -
+3 peripherialsHello All, I'm a recent returner to the speccy after stumbling across the excellent games bible on lulu.com, after buying the first couple of books …
... two internal ROMs, and a ROMCS for each (and IIRC, none ... of the two ROMCS signals on the +3 are ... a +3, which means both ROMCS get held).
