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Help understanding the Z80.So I have a Z80 CPU and a 32k ram chip. I understand how they connect. (Data and address busses, chip select etc.) But how would i input information…
... would have to use a ROM chip or something else that has ... isn't a ram and ROM signal pin on the z80 ... -
Help understanding the Z80.So I have a Z80 CPU and a 32k ram chip. I understand how they connect. (Data and address busses, chip select etc.) But how would i input information…
... have to use a ROM chip or something else that ... , usually it's a rom chip mapped to address 0. ... spectrum has a 16k rom chip mapped to addresses 0-16383 ... />
A 32k rom chip might be mapped to the ... for the ram chip. But the ROM chip should only respond ... -
Help understanding the Z80.So I have a Z80 CPU and a 32k ram chip. I understand how they connect. (Data and address busses, chip select etc.) But how would i input information…
... control when the ram chip will respond and if ... br />
The 32k rom chip example had it mapped into ... />
If your ram chip was smaller, say 8k, it ... the z80 directly to the chip's address pins. But ... A13 = 100 to its chip enable logic. On the other ... -
Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…
... mean.
Differences in the ROM make absolutely no difference to ... of the data in the ROM chip.
Full or partial address ... -
Keeping Your Spectrum Original. This "thread" believes this is best approach to owning Speccies and will cater for all those who like a Museum Approach . How does one keep one…
... moded/upgraded unit. When the ROM chip is faulty you will go ... -
ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... Claudius;906840"]There is no ROM's content difference between iss3 ... />
The contents of the ROM did not change on any ... used a number of different ROM chip manufacturers. Under the heatsink are ... the H-N ROM selection links. Details of which ... -
Repair ZX Spectrum +2 black issue 1Hi all, after a long time i will try to repair a ZX Spectrum +2 black i found the last days i know for sure that CPU is damaged (already repla…
... in order to make a rom tester when trying repairing my ... then i still have this rom tester and its working? maybe ... i should put this test rom chip? +2black has 2 roms ics ... -
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... to low,
b. The ROM chip detects CS and reads the ... address,
c. The ROM chip finds contents and places it ... data lines,
d. The ROM chip sets OE to low
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... other words the original Hitachi ROM chip was way too powerful for ...Repair ZX Spectrum +2 black issue 1Hi all, after a long time i will try to repair a ZX Spectrum +2 black i found the last days i know for sure that CPU is damaged (already repla…
... programer and burn the 2 ROM chips.
i have ... +5 volts on all CPU,ROM and RAM ics and they ... when remove one of the rom chip the screen remain the same ... i am thinking is a rom problem)
thanks for ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... , not the second custom Sinclair chip).
[*]Turned pin DIL ... EPROM and a normal ROM (for testing ROM chips). And a switch ... chips.
[*]Same with the ROM, Have test links that can ... to take either type of ROM chip.
[*]Have been composite video ...ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... , not the second custom Sinclair chip).
[*]Turned pin DIL ... EPROM and a normal ROM (for testing ROM chips). And a switch ... chips.
[*]Same with the ROM, Have test links that can ... to take either type of ROM chip.
[*]Have been composite video ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... I have "taken out the ROM chip" . I did wonder about this ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
I carried on with the recap and finished it . It did not get rid of this fault though . I have no idea why it happened . It has not happened before like this when I have recapped in similar fashion . It appears to be behaving like there is no ROM chipTroubleshooting RAM IC's on Spectrum +2 Grey?Got myself a grey +2 but at startup it shows something very similar to this: [img]https://preview.ibb.co/mmai5F/2_Ram_Fault.png[/img] I also su…
... is with a test ROM that tests the RAM ... enough for an original Sinclair ROM to work.
The ... byte (which corresponds to which chip(s) are faulty) are ... is working, the test ROM can write the results of ... Can you check that the ROM chip on your board is socketed ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... " tracks getting back to the ROM chip OK . And there are no ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... us which pin of the ROM this track connects to...
ROM chip wiring (as in the schematic ... . The only difference being the ROM type selection links.
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
Unless it is the chip itself that has bust and ... tracks shorted out the ROM chip and the shorted chip now incorrectly gives ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
It's possible, but not very likely that the ROM chip is the cause of the short.
[b][i]Mark[/i][/b]Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... good clean image of the "ROM failure" fault (so as faults ... appears on the "soldered in" ROM chip itself and other Spectrums do ... escape the conclusion that the ROM chip itself has shorted . But I ... accept that the Speccy ROM is one of the more ...Did you know there were Arabic versions of Spectrum ROMs?Stumbled upon it completely by accident, but apparently Sinclair (or Amstrad?) sold Spectrums in the Middle East. [url="http://www.nightfallcrew.com/…
Yup. Sinclair Egypt. The ROM images are courtesy of Mohammed ... have this second ROM installed piggybacked over the usual ROM chip, with a ...Fuse 1.4.0 releasedA new release of Fuse, the Free Unix Spectrum Emulator, is now available at the SourceForge project: https://sourceforge.net/projects/fuse-emulato…
... .rom
d5869034604dbfd2c1d54170e874fd0a *gluck.rom
0da70a5d2a0e733398e005b96b7e4ba6 *trdos.rom[/code]
Pentagon 128 ...ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
... CPU a clock and a ROM chip, and it should run.
chip that is often referred to ...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
... with or without the ROM. And that same ROM is ok when ... /> I have been switching the ROM chip from the TS-2068 version ... to remove and replace the ROM that the computer halves were ... a sudden, after replacing the ROM, I get this problem...
Opus Discovery not WorkingHello hope you can help, or if this thread goes well that you also find the answers you are looking for... I have an Opus discovery that does not …
... , seems to have been the ROM chip. I measured all voltages and ...help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …
... caused by a faulty RAM chip.
The quickest and ... a test diagnostic program from ROM.
Do you have ... a ROM chip or a ROM image file?
Is the ROM chip on ... who can program an EPROM chip?
[b][i]Mark ...help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …
... a test diagnostic program from ROM.
Do you ... a ROM chip or a ROM image file?
Is the ROM chip on ... who can program an EPROM chip?[/quote]
I have ... interface 2!
No other rom stuff unfortunately.
I think ...
