-
The much rumoured Pandora is finally being built !!!!!!!20 years late though. Its from the people who made the GP32, GP2X. Its a hand held similar in size to a DS. [IMG]http://pandora.bluwiki.com/images/…
... 't directly access the video RAM). The upshot of that is ... gain access to it (and upper RAM, too). The second CPU is ... stuff fixed - they're just not interested. Hence, those same distributors ... -
CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …
... progress bar though (for when upper RAM is being set), and it ... saved the first 16K of RAM as a binary there would ... point where it was just not loading for me.
not sure what caused this, as ... -
CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …
... A=$FF (anything else is not a NEW), so it should ... needed to fill upper RAM at all?
If not, then this ... /> ld de,$8000 ; first not free RAM
xor a
ld ... -
New Guy Wants Speccy - SWAP !Hi, I`m new here so here is a little background info ! I always had a C64 when I was in my teens in the 80`s, my friends had Spectrums, so it was alw…
... available then so all is not lost !! :)[/QUOTE]
That ... :D
4116 RAM chips, 4164 upper RAM chips, any of the ... -
Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…
... page 5 or 2, not just limited to page 5 ... />
The only disadvantage is not being able to have use ... and copy it into the upper RAM bank, and go back to ... dos (repeat until upper bank is 'full' / my ... dos routines from the upper bank (as ram page 7 is ... -
16 K Sinclair Spectrums Still Available?Hi. I wanted to know if the 16 K Sinclair Spectrums are still available to buy. I have looked around on the net without any success. Maybe someone kn…
... =rustyredline;415383]the lower ram 16k should not be touched if it ... spectrum will not function, you mean remove the upper 32k by ... />
4116=Lower ram=16K
4164=Upper ram=32K
... will test which of the ram is not working.
... -
Looking for some 48k RAM (upper 32k bank)Greetings, I was wondering where I could find some upper RAM for a 48k (issue 4A). It's the Texas Instruments TMS4532-20NL4 P8419 (or any compatib…
... /150ns if possible. If not, 200ns, but not slower than that, because ... delay generated by the RAM managing logic may not be adequate.
upper RAM would just fail?[/quote]
Those RAM are actually 4164 RAM's with a defective ... -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... low, and thus disable the upper 32K. Not airtight, but a lot ... ignore the upper 32K: if faulty, it usually means bad RAM locations ... , which reduce the Spectrums available RAM but shouldn't prevent it ... commands, regardless of what the upper 32K RAM is doing. -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
... machine the 32k of expansion RAM can be isolated. An easy ... , assuming that the ICs are not fitted into sockets, is to ... to +5V. That will isolate upper RAM from the bus, disabling them ... -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
[QUOTE=gibs;431363]Hi Miguel,
Before doing it, I checked the voltage on IC23 Pin 5 and I already have 5V...:???:[/QUOTE]
That's normal... it's 'logical high' most of the time (>2V by definition, normally close to +5V supply voltage), but ... -
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... the lower RAM?[/QUOTE]
Ehm... no. Not for a ... for the Speccy's lower RAM too).
... they work as Spectrum lower RAM too? And: anyone ... if other alternatives work or not...
[QUOTE= ... the old 4116's (and upper RAM?) with modern IC's, ... -
ZX Spectrum + Issue 6A Repair attemptHello everybody! I got ZX Spectrum + which doesnt work properly. On power up I can see color mosaic, then paper goes black and i can see thin red ba…
... your post I assume the upper RAM chips aren't socketed? In ... in the air'.
Not sure what to make of ... always a prime suspect (especially RAM, sometimes ROM), but could also ... faulty but not completely dead. Let's hope disabling the upper RAM provides ... -
48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…
... probably removed and replaced the upper RAM, possibly fitting sockets, and possibly ... although I admit I did not look into what the effect ... up again.
Am not sure what the problem with ... so a loose connection is not likely, it works fine when ... -
zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…
... faulty (which I find not very useful. It ... contended bank, and an upper RAM region (32K) which ... belongs to the non-contended RAM.
... If the non-contended RAM is damaged, the machine can ... br /> If the contended RAM is damaged, the computer hangs ... -
Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…
... unusual that failed RAM chip(s) in the [I]upper[/I] 32K ... would cause a Speccy to not work.[/QUOTE ... more upper RAM chips, it's normal that the Spectrum will not work ... -
Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…
... inserted the logic chips but not the ram, I get the white ... this to happen (with no upper RAM chips present!), but looks like ... you go the SRAM for upper 32K route, you don't ... -
Official CSSCGC 2010 Competition ThreadDear Wossers, As 'loser' of the 2009 competition, I am now obliged to host the 2010 competition. I have created a site which will provide a hub for …
... zeros I do not know, perhaps somebody does not
... long "PLEASE WAIT" - not sure what is so tricky ... poking a few bytes of upper ram, but still!"
Not quite, and many of them ... />
Crap does not mean lazy, and this is ... -
Official CSSCGC 2010 Competition ThreadDear Wossers, As 'loser' of the 2009 competition, I am now obliged to host the 2010 competition. I have created a site which will provide a hub for …
... I do not know, perhaps somebody does not
... poking a few bytes of upper ram, but still!"
Not quite, and many of them ... br /> Iceman[/QUOTE]
Not sure why I am getting ... ManicMiner, all rooms are not a fixes size in ... -
repaired a 48K, yay :)I just managed to repair one 48K. After socketing all eight lower RAM chips (hard work!) and replacing few of them, it showed the familiar "Sinclair …
... memory). The lower 16K of RAM is problematic to 'modify' for ... a number of reasons, not least its relationship to the ... />
In contrast, for the upper (32-64K) memory area, it ... static RAM as you're not dealing with the ULA. The upper RAM connects ... -
repaired a 48K, yay :)I just managed to repair one 48K. After socketing all eight lower RAM chips (hard work!) and replacing few of them, it showed the familiar "Sinclair …
... ]
Don't see why not (above site is mine btw ... find) or 64K x 4 (not that common, but small stocks ... DRAMs? Either for lower or upper RAM? :-? Or perhaps even 256K x ... could replace the lower (or upper) RAM with just 2 DRAMs & ... -
New game: BozxleHere is a new game called BOZXLE which has been written within a week. The screenshots are of the game running on a 48K. This runs also on the 128 …
... 's not enough space left to store additional tiles in the upper RAM ... , you could stored in contended RAM a set ... copy the appropriate set to upper RAM when starting a game or ... -
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…
... whether to remove it or not. If you can reassure me ... load a 48K game. Probably not but I've had limited ... probably points more towards flaky upper ram though.
From what ... -
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…
... for response wozname. I'm not overly intimidated by the soldering ... 360 so I'm definitely not a novice when it comes ... pair of hands (or certainly not as steady as they were ... leads me to believe that upper ram is definitely suspect. Unfortunately I ... -
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…
... was obvious that it was not required with the version ... but if it's not required then it has ... for my upper ram! Does this mean that all 8 upper ram chips ... it likely all the ram chips are bad or could ... 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 ... fails, one (or more) RAM chips are not returning the correct 1 ... -
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 ... single bit failure (1 bad RAM chip) is enough.
Not sure if you can manage ... I] to replace the upper RAM with a single 32K ... equivalent). But since the upper 32K chips are soldered ... -
Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…
... /> Easy even if you're not skilled with soldering iron. :smile ... LM1889 Video chip? Does it not need +12 Volt too?[/QUOTE ... for lower [I]and[/I] upper RAM (details [URL="http://bitcycle.org ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... be fine.
The upper RAM (like the lower) is soldered ... as if the CPU is not trying to step through memory ... the CPU is at least not completely dead.
I ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... 'd probably result in the upper RAM putting stuff on the data ... RAS/CAS circuitry for the upper RAM. I suppose I should draw ... a mechanism for refreshing the upper RAM while the ULA has stopped ... on the upper RAM /CAS (quite why these happen, I'm not sure ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... on the upper RAM /CAS (quite why these happen, I'm not sure ... ROM, and if there's not anything in the databus that ... written to the top of upper memory, downwards. This is why ... you observe CAS pulses on upper memory.
