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Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…
... just a small area of lower RAM. It stripes a random sequence ... most of the common Spectrum RAM faults. -
Z80 new old stockHi. I found this on eBay but ... is there a way we could know they don't hav a faulty M1 line? [url]http://www.ebay.com/itm/Zilog-Z80-CPU-Z0840004PS…
... Z80's outputs have much lower output impedance than the older ... overpower the outputs of the lower RAM while the ULA is reading ... memory instead of what the lower RAM is outputting. -
Help A Dim Man With UbuntuHeeeeeeelllllppppppp!!!!!!!!!!! I have XBMCbuntu installed on my media PC which normally works great. I logged out of XBMC into the desktop and th…
Not sure what you did with ... ]sure[/B] we're not talking memory (RAM) issues here? :???: (since you ... -
48k faultyHi guys! I have a 48k that, currently, presents 2 problems: 1 - Can?t sync to TV correctly. I get a lot of noise and the characters appear to be inc…
... , +12 and -5V) at the lower RAM.
Only when that ... -
HxC Floppy Drive Emulator - help neededHi! I?m really having difficulties with my new HxC SD card floppy emulator on a Spectrum +3. It?s REV C cased light gray, with no labels on it, so I…
... index pulse that it is not seeing. One of the signal lines ... -
16k --> 48kI bought a zx and found out it was a 16k since when I execute PRINT PEEK 23733 I get 127 Does it mean I get a lesser model? What limitations do I h…
... the worst case, destroy the lower RAM ICs. -
Off to see the old man tonightLiterally. Not seen my dad since I was 17 and I'm now 40. Can't believe 23 years has passed! If you're curious it was my decision to cut all ties …
Good luck! It's better to visit him now than regretting not seeing him later. -
last live band you saw?just realised that I can't even remember the last time I watched a live band/music performance. Must be over 5 years I reckon, possibly it was dj hyp…
:-o
Impressive metal lists there! Did anyone see Pantera? I'll forever kick myself for not seeing them while i had the chance... -
last live band you saw?just realised that I can't even remember the last time I watched a live band/music performance. Must be over 5 years I reckon, possibly it was dj hyp…
[QUOTE=GreenCard;686329]:-o
Impressive metal lists there! Did anyone see Pantera? I'll forever kick myself for not seeing them while i had the chance...[/QUOTE]
Twice :D :-P -
last live band you saw?just realised that I can't even remember the last time I watched a live band/music performance. Must be over 5 years I reckon, possibly it was dj hyp…
[QUOTE=GreenCard;686329]:-o
Impressive metal lists there! Did anyone see Pantera? I'll forever kick myself for not seeing them while i had the chance...[/QUOTE]
Yep, saw 'em. They were ok, nothing special. -
last live band you saw?just realised that I can't even remember the last time I watched a live band/music performance. Must be over 5 years I reckon, possibly it was dj hyp…
... 'll forever kick myself for not seeing them while i had the ... -
last live band you saw?just realised that I can't even remember the last time I watched a live band/music performance. Must be over 5 years I reckon, possibly it was dj hyp…
... 'll forever kick myself for not seeing them while i had the ... -
Fully-addressed devices initiative (FADI)I would like to introduce an initiative for those who create new pieces of hardware containing legacy devices with well-known addresses. It says that…
yup, my point was that you only have to look at a 48k funny and the lower ram chips all die ;)
On the other hand you can unplug things from the +3 all day and it doesn't seem to care. -
Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…
I don't see why they shoudn't :) -10 means 100ns, doesn't it? Faster memories can operate at lower speeds (not much lower, but 120ns vs 100ns is not a huge difference) -
Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…
[QUOTE=mcleod_ideafix;690534]I don't see why they shoudn't :) -10 means 100ns, doesn't it? Faster memories can operate at lower speeds (not much lower, but 120ns vs 100ns is not a huge difference)[/QUOTE]
worth a try then,
thanks -
Kung-Fu D'n'B Mix[IMG]http://i46.tinypic.com/357o7k9.png[/IMG] [url=http://soundcloud.com/user2316397/def-chris-kung-fu-dnb-mix]Stream[/url] [url=http://soundcloud.co…
Nice one, but I'm not seeing Ni Ten Ichi Ryu by Photek on the list (Yes I know Samurai are Japanese, and Kung fu is Chinese, but it didn't stop them remaking The Karate Kid even though it was set in China and contained no actual Karate....so there :D). -
Kung-Fu D'n'B Mix[IMG]http://i46.tinypic.com/357o7k9.png[/IMG] [url=http://soundcloud.com/user2316397/def-chris-kung-fu-dnb-mix]Stream[/url] [url=http://soundcloud.co…
... ]Nice one, but I'm not seeing Ni Ten Ichi Ryu by ... -
Kung-Fu D'n'B Mix[IMG]http://i46.tinypic.com/357o7k9.png[/IMG] [url=http://soundcloud.com/user2316397/def-chris-kung-fu-dnb-mix]Stream[/url] [url=http://soundcloud.co…
... ]Nice one, but I'm not seeing Ni Ten Ichi Ryu by ... -
Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …
... contacts.[/QUOTE]
The upper RAM is soldered to the board ... if it successfully checks the lower RAM?
Will definitely be ... to swapping out the faulty RAM. -
Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …
... if it successfully checks the lower RAM?[/QUOTE]
It's ... test doesn't identify upper RAM as faulty and then the ... help either if the upper RAM interferes on the data bus ... and 7 in the upper RAM and I believe those are ... -
Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …
... /> I think replacing the faulty RAM will solve the problem.
The RAM chips are responsible for dealing ... address bus to the RAM, two for the lower RAM and another two ... as that could kill the lower RAM. I want to encourage everyone ... -
Time for all games to become (legally) available?It just came to me that none of us are getting any younger. Not much of an earth-shattering statement I know, but more came of this original thought.…
... because something is legal does not make it right.
... point, or are genuinely not seeing what I'm asking. ... something makes money or not on something they own, ... the point. I am not saying that (for example), ... twenty-five years is not long enough for the ... -
Time for all games to become (legally) available?It just came to me that none of us are getting any younger. Not much of an earth-shattering statement I know, but more came of this original thought.…
... ?[/quote].
That's not using my argument at all ... because something is legal does not make it right.[/quote]
not seeing what I'm asking. Why ... money?", [/quote]
Why not indeed
[quote ... -
Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…
... screen. I removed the upper RAM and interface chips so that ... again:
- Quit upper ram
- Power on.
- Check ... . Check +5v, +12v, -5v in lower ram.
- If spectrum doesn't ... -
Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …
if all the voltages are present on the lower RAM then I don't see how TR5 can be blown :confused: -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... 7 address lines of the lower RAM. (Similar to what you did ... ULA.
Note that the lower RAM is directly connected to ULA ... resistors to Z80 + ROM + higher RAM. -
Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …
Afraid I dont have an oscilloscope Zorn (wouldnt know how to use one anyways!) BUT, I checked the lower RAM wrongly, these are the readings on all lower 16k
Pin 1 0.12v
Pin 8 0.15v
Pin 9 5v -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... 7 address lines of the lower RAM. (Similar to what you did ... ULA.
Note that the lower RAM is directly connected to ULA ... resistors to Z80 + ROM + higher RAM.[/QUOTE]
Rodger that ... -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... happens when there's a lower RAM fault. Try the tests roko ... -
48k + Spectrum Issue 4S Display IssueHi all! Brand new user here. Growing up I had a zx spectrum for a little bit, and recently I have bought a working 48k + Spectrum (Issue 4). I was…
... but 3 of the original lower RAM chips with new ones (MK4116N ...
