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+2: 128k enhanced games no longer loading (but OK in 48k mode) :-/Having a spot of bother with my +2, a couple of my favourite games are now refusing to work in standard "Tape Loader" based 128k mode - Marauder (Hew…
... you could then check the RAM in 49152-65535, although anything ... bad addresses that are not intermittent). Lines 10 and 50 are ... -
Windows updates pain.What a pain they are,recently i had to reinstall vista,and for security/virus reasons downloaded the all the fixes,lucky to have broadband but the do…
[QUOTE=AndyC;531718]Component failure, especially hard disks and monitors, ... CPU and 256 megs of ram from ten years ago is ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... (the last 256 bytes of RAM) are filled with 0 just ... an indication of a refresh failure, and hence, the presence of ... -
Spectrum not working, can anyone help this lady?[URL="http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152"]http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152[/URL]
... it's the most common failure). A failure in one of the ... it's probably a damaged RAM in the lower bank. If ... , and if the 16K lower RAM bank is not being fed ... -
Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... ,fallo ;if different, goto "fallo" (failure)
djnz buc1 ;next value ... bode well for my upper ram! Does this mean that all ... 8 upper ram chips are caboosed? As I ... logic chips which control the ram which are bad?
< ... -
Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
To really know which upper RAM chips are playing up you ... returns the address of the failure and the fact is it ... that fails, one (or more) RAM chips are not returning the ... -
Requesting a little help to identify the purpose of this 'add-on' to my Issue 2Hi everyone First of all it's my first post here so please go easy on me! I'm grateful to be accepted into your fine little club :smile: I probabl…
... mean that all 8 upper ram chips are caboosed?[/QUOTE]
failure (1 bad RAM chip) is enough.
RAM chip(s) are bad. I ... [/I] to replace the upper RAM with a single 32K x ... -
Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…
[QUOTE=karingal;585833]No thats just failure to communicate.[/QUOTE]
RAM pack wobble says what? -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
The lower 16K of RAM is formed by IC6-IC13 ... to the lower RAM that led to the failure. If you don ... -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... , a single failure could cause all your new RAM chips to die ... -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
... the lower RAM is far more prone to failure and the picture ... could take out your replacement RAM. -
Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…
... more (or all) the upper ram is dead?[/quote]
Based ... , bad chips?[/quote]
- Upper RAM exposes their data bus on ... removed in a specific order. Failure to obey this leads to ... 4164 chips that had the failure located at one specific 32K ... -
Broken Multiface 3, can it be fixed?Hi Dusted off my old Multiface 3 and unfortunately it doesn't work. With it plugged in the computer just shows a garbled screen of coloured blocks t…
... s some selection logic, a ram and a rom chip.
ram or rom chip) or ... /> Pull out the rom and ram if possible, and try the ... /> If you can point the failure to one of the chips ... />
If not socketed, the ram and rom chips should be ... -
Broken Multiface 3, can it be fixed?Hi Dusted off my old Multiface 3 and unfortunately it doesn't work. With it plugged in the computer just shows a garbled screen of coloured blocks t…
... s some selection logic, a ram and a rom chip.
ram or rom chip) or ... /> Pull out the rom and ram if possible, and try the ... /> If you can point the failure to one of the chips ... />
If not socketed, the ram and rom chips should be ... -
Broken Multiface 3, can it be fixed?Hi Dusted off my old Multiface 3 and unfortunately it doesn't work. With it plugged in the computer just shows a garbled screen of coloured blocks t…
... s some selection logic, a ram and a rom chip.
ram or rom chip) or ... /> Pull out the rom and ram if possible, and try the ... /> If you can point the failure to one of the chips ... />
If not socketed, the ram and rom chips should be ... -
Outrun Europa in colourSwainy suggested that he'd like to try his luck with Outrun Europa colorful graphics and see if they can be improved. Let's give him the chance :) A…
... hardware isn't a complete failure. The prototype has been fixed ... with the same amount of RAM available as on a BBC ... else that needs an all-RAM mode (such as the IF2 ... -
48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…
... ) etc.
If lower ram has been connected all this ... , and you have had a failure of the DC-DC circuit ... one or more of the ram chips of lower ram is dead. -
128k gone badHi All, Turned my 128k on this morning and... [img]http://www.w.angold.btinternet.co.uk/bad128small.jpg[/img] Can anyone help? whats the most lik…
Almost certainly bad RAM (one or more bad RAM ICs)
If you have a DivIDE or any other piece of hardware that makes a 128K come up in USR 0 mode, if the failure is in upper memory it's very easy to find using BASIC POKE and PEEK. -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... looking for electrical faults (including intermittent faults) that don't want ... control bus. Leave all the RAM chips (and associated 74LS TTL ... as you will have no RAM, you cannot use any ... instructions that need RAM (no stack, no subroutines) ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... looking for electrical faults (including intermittent faults) that don't want ... control bus. Leave all the RAM chips (and associated 74LS TTL ... as you will have no RAM, you cannot use any ... instructions that need RAM (no stack, no subroutines) ... -
Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…
... lower ram with 4164s asap since I have noticed they survive failure ... -
16k Issue 2 board and DivIDE load errorsI today got an Issue 2 16k board (thank you PMSR) that i added the logic and ram on to get a 48k machine. However, I am unable to load software from …
... socketed CPU, ROM and Lower RAM (4164s I find to be ... die if you have a failure in the power circuit).
Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …
... 74HCU04 failure, but in doing so I'd replaced the RAM chips ... with known good, new RAM chips just to be safe... ... were the [i]wrong[/i] RAM chips!
It's ...Query about memorySo I know this has been asked a lot and I beg your brief indulgence. I have scanned through a lot of old threads already but I'm trying to improve m…
... />
The type of RAM chips used in the ZX ... are eight DRAM (Dynamic RAM) chips each 16k addresses ... (the "bottom" 16k of RAM) plus eight DRAM chips each ... (the "top" 32k of RAM) giving a total of 48k ... address matrix has a partial failure but the data line ...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…
... trying to track down an intermittent memory fault. It can test ... either all of upper RAM or just a small area ... of lower RAM. It stripes a random sequence ... most of the common Spectrum RAM faults.Help me resurrecting a 128KHello to everybody. I'm really struggling along a repair of a standard 128K a friend of mine handed me over some (ok, actually a lot of) time ago. A…
... colors (therefore accesses correctly the RAM bank), then the only possible ... 7th 4164 of the uncontended RAM bank, and the test routine ... a write failure of bit 6 and a missing RAM. Any hint ...ZX Spectrum + 2 128K - Video Issue?Hi All, I have just picked up a secondhand +2 and am having a problem with it. :( When I power the unit on and hook it up to my TV with the RF cable…
... sync signal.
The failure of the Spectrum to get ... most likely a failure of one of the RAM chips. This is ...ZX Spectrum + 2 128K - Video Issue?Hi All, I have just picked up a secondhand +2 and am having a problem with it. :( When I power the unit on and hook it up to my TV with the RF cable…
... sync signal.
The failure of the Spectrum to get ... most likely a failure of one of the RAM chips. This is ... only 1 fault with the RAM chip then?
Also ...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…
... a failure could, in the worst case, destroy the lower RAM ICs ...ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …
... ? :)
If it's RAM, the screen will be black ... .
The screen screams "CPU failure" to me, but the border ...
