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Replacing Upper RAM in 48KHi Folks Well, my fun continues :) After sorting the display issues with this machine I found I couldn't load software meant for 48K machines. Havin…
@ArtemKuchin
building one in, sounds like a lot of fun!
for the most part it could sit on the CPU socket, but you would need pick-ups for /ROMCS /RAMCS -
Replacing Upper RAM in 48KHi Folks Well, my fun continues :) After sorting the display issues with this machine I found I couldn't load software meant for 48K machines. Havin…
... would need pick-ups for /ROMCS /RAMCS[/QUOTE]
not ... -
z88dk SP1 - any internal oddities?I'm just wondering if anyone knows if the Z88DK's spritelib SP1 has any oddities inside, for instance relying on specific timings, undocumented instr…
... machines for sure :-) (Well, +3 ROMCS notwithstanding) -
Divide 2k11Hi All, I am thinking about buying a divide 2k11. Does anyone know if there are any compatibility problems with it and: a) 128k toastrack with inter…
... it handles the NMI and ROMCS lines. It's possible that ... -
Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…
Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…
Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…
... "normal", no matter if the ROMCS RS latch was set or ...Messenger interfaceHave anyone photos, schematic, rom images, documentation, or software for Messenger interface ? [url]http://www.worldofspectrum.org/infoseekid.cgi?i…
... anything (for example, because ROMCS is active and EPROM isn ... sometimes the RS flipflop causes ROMCS to be active, disabling the ... it hangs. Measuring pins: ROMCS is low. EPROM_CS and RAM_CS ... this happen with your equations? ROMCS and (EPROM_CS & RAM_CS) ...Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…
... when you pull on the romcs lines... I wonder, did I ...Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…
... to log.1 and ignore ROMCS line from external devices)Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…
... my excuse for forgetting about romcs not being a ramcs :)Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …
... , the same is done with ROMCS and INT. Both signals consist ...Sending key presses to the spectrumfor a project I want to send automated keyboard presses to the ZX via a micro-controller. Is it possible to send these through the expansion slot? …
... , the same is done with ROMCS and INT. Both signals consist ...Spectranet updateHi all It's been a busy summer, and in any case I've wanted a little bit of a break from doing Speccy stuff to avoid it getting old (pun intended). …
... connector layouts and have two ROMCS signals.
If the ...Edge connector breakout board/level translator boardFor a new project I'm thinking of working on (gah, too many projects...) I'm going to be making a new edge connector breakout board. Basically what …
... with a jumper to operate ROMCS (global clock pins can also ...Edge connector breakout board/level translator boardFor a new project I'm thinking of working on (gah, too many projects...) I'm going to be making a new edge connector breakout board. Basically what …
... headers though if required).
* ROMCS option provided - one pin can ... either a GPIO or ROMCS.
* +3 ROMCS jumper provided.
* 39 ...Edge connector breakout board/level translator boardFor a new project I'm thinking of working on (gah, too many projects...) I'm going to be making a new edge connector breakout board. Basically what …
... headers though if required).
* ROMCS option provided - one pin can ... either a GPIO or ROMCS.
* +3 ROMCS jumper provided.
* 39 ...semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…
... [/I] surprised if ULA's /ROMCS signal didn't include /MREQ ... " in schematic) to put that /ROMCS signal on pin 20. Next ...Edge connector breakout board/level translator boardFor a new project I'm thinking of working on (gah, too many projects...) I'm going to be making a new edge connector breakout board. Basically what …
... and a transistor for the ROMCS function and a few jumpers ...semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…
... ULA include /MREQ in the /ROMCS logic.
If yes, then ... ULA circuit that generate the /ROMCS does not include /MREQ then ... included in the logic for /ROMCS, why feed /MREQ to the ...semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…
... connector is connected to the !ROMCS pin of the ULA (34 ... resistor. This means that the ROMCS on the edge connector overrides ...Edge connector breakout board/level translator boardFor a new project I'm thinking of working on (gah, too many projects...) I'm going to be making a new edge connector breakout board. Basically what …
... and a transistor for the ROMCS function and a few jumpers ...semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…
... included in the logic for /ROMCS, why feed /MREQ to the ... page 181 of his book: /ROMCS=A14+A15. The diagram is ...semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…
... page 181 of his book: /ROMCS=A14+A15. The diagram is ... doubting now... :lol:
/ROMCS including /MREQ makes sense as ... 16.pdf"]schematics[/URL] for /ROMCS generation include /MREQ as an ... A14/A15 inputs, see what /ROMCS output does, and draw conclusion ...Edge connector breakout board/level translator boardFor a new project I'm thinking of working on (gah, too many projects...) I'm going to be making a new edge connector breakout board. Basically what …
... put on the transistor for ROMCS, I want to test the ... the GPIO pins and the ROMCS pins, although I'm just ...WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... another GPIO going right through ROMCS. There's something odd with ... which tries to drive the ROMCS pin. The ROMchip remained disabled ... Logic inside FPGA detects whether ROMCS is high, and if it ... because of the ROMCS issue discussed above, the ROMCS pin from the ...WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... DivIDE. It seems that the ROMCS control is not as good ...WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
Have you tried it with the Spectranet at all? I can't imagine there'll be an issue (Spectranet holds the ROMCS with an open drain P-type MOSFET - how does the DivIDE do it?)WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... |
|
| ROMCS at rear bus
|< ... br /> |
E |
ROMCS from | ^-------+
----------------|/
...WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... . The scope revelaed that the ROMCS from the ULA wasn't ... standard 680 ohm resistor between ROMCS and ROM OE pin. I ...
