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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 ... -
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 …
... is it needed to fill upper RAM at all?
If ... de,$8000 ; first not free RAM
xor a
ld ... -
A 64K Spectrum?? Is this real?I have seen avertised on Ebay today two boxed ZX Spetrum Rubber Keys. One 16K and the other a 64K upgraded model?? Is this for real??? [url]http://…
... Spectrum really had 64k RAM? (With the first 16k as the fixed ... accurate a 48k contain 48k RAM and 16k ROM. -
A 64K Spectrum?? Is this real?I have seen avertised on Ebay today two boxed ZX Spetrum Rubber Keys. One 16K and the other a 64K upgraded model?? Is this for real??? [url]http://…
... Spectrum really had 64k RAM? (With the first 16k as the fixed ... [/i], of which 48K is RAM and 16K is ROM (which is ... not RAM). (Although if you were being ... -
Which computer is most similar to Zx Spectrum?I have wondered recently wihch other 8-bit computer is most of all similar to Zx Spectrum. I mean similar graphics, similar gameplay, similar program…
... of BASIC
48K RAM and 16K RAM models (though Oric's are ... -
Help! USR 0 mode?Right, first of all, I know that this is in the wrong forum, and secondly it's maybe against the TOS anyway, as it's just asking people to read and p…
... br />
In fact, the RAM Testing routine called at the ... start fills the entire available RAM with Value "02" and ... "00" to test if RAM is 16K or 48 or defect (this ... Demo). This is clearing the RAM completly and a reason why ... place of ROM (in Multiface RAM). -
R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... / Ohms...would this cause the failure? It did work flawlessly until ... suggest it's a lower RAM failure, but it could be the ... -
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…
... :D
4116 RAM chips, 4164 upper RAM chips, any of the ... -
Windows Vista?I'm having real trouble finding a decent spec. laptop that has Windows XP on it, it's all Vista Vista ****ing Vista. I've down (well, let's be honest…
... memory (shared with video RAM), a 16K OS stored in ROM, and ... -
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…
... , as if DOS is active, RAM Page 7 is here instead ... and copy it into the upper RAM bank, and go back to ... dos (repeat until upper bank is 'full' / my object ... dos routines from the upper bank (as ram page 7 is active ... -
New BUZZSAW+ Demo, No.2OK everybody, here's the latest demo of [I]Buzzsaw[/I]. This includes the title screen I wrote in Corfu with control selection, some new sprites and…
... careful what goes into slow RAM.
The ... held in the slow RAM area so freeing more ... (screen) are in slow RAM (bottom 16K) and half (attributes) in ... the tables being in slow RAM don't matter.
... the attribute tables in fast RAM. But I think there ... -
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…
... the closest to the OEM RAM.
Anyone have any ... on why some of these upper RAM would just fail?
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…
... the closest to the OEM RAM.[/quote]
Go for 100 ... CAS delay generated by the RAM managing logic may not be ... on why some of these 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…
... machine the 32k of expansion RAM can be isolated. An easy ... 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…
... 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 first 16 K of RAM. In this case, you'll ... only need +5 volt. The upper ram I changed with one 32K ... ram.
12 volt for ...Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... only need +5 volt. The upper ram I changed with one 32K ... ram.
...
... the PCB? What 32 K RAM have you used?Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... the PCB? What 32 K RAM have you used?[/QUOTE]No ... 4164 rams for the lower ram instead 8 4116 rams.
upper ram.
MickyRemove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... [I]both[/I] lower and upper RAM, power supply for the video ...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 ... always a prime suspect (especially RAM, sometimes ROM), but could also ... . Let's hope disabling the upper RAM provides some clues...Spectrum lost upper memoryHi again, I have a Rubber key Spectrum(issue 4S) which lost it's whole upper memory. It's worked okay, but i forgot it on over last night. My son wa…
... /> One memory fault to the upper RAM can knock the whole lot ... . There are 8 RAM chips making up the upper RAM along with some ... down discusses replacement OKI 3732 RAM but your Spectrum will use ... two types of "half faulty" RAM which you need to identify ...The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... out of 10, RAM problems are with lower RAM (the 4116 chips ... significantly more fragile than the upper RAM. Usually it's just one ... edge connector to test the RAM and tell which chip is ... bad.
4116 RAM was pretty much obsolete in ...The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…
... out of 10, RAM problems are with lower RAM (the 4116 chips ... significantly more fragile than the upper RAM. Usually it's just one ... edge connector to test the RAM and tell which chip is ... bad.
4116 RAM was pretty much obsolete in ...zx spectrum ULAis the ULA in the 16K the same as in the 48K could you take the 16K ULA and place it in a 48K I ask this because i have a speccy thats dogy with th…
Without the ULA you'll see nothing, because it generates the video. If you see the black rectangle with red lines, at least partially, it means the CPU starts and trying to perform RAM test. For me, it looks more like RAM failure.48k or 16K ?Hi All Something I do not recall, how do you tell a 48k rubber key Spectrum from a 16k ? Thanks for reading
... key Spectrum from
a 16k ?
Thanks for ... have a 48 with dodgy RAM, the 16K's reset sequence is ... 0 it's not a 16K if it prints 255 it ... is a 16K (or it has dodgy RAM).48k or 16K ?Hi All Something I do not recall, how do you tell a 48k rubber key Spectrum from a 16k ? Thanks for reading
... have a 48 with dodgy RAM, the 16K's reset sequence is ... 0 it's not a 16K if it prints 255 it ... is a 16K (or it has dodgy RAM).[/QUOTE]
ram or possibly loose chips, as ...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 ... (ground) in one or more upper RAM chips, it's normal that ...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)…
... logic chips but not the ram, I get the white and ... this to happen (with no upper RAM chips present!), but looks like ... you go the SRAM for upper 32K route, you don't ...broken 48K, strange screenwell I finally socketed all lower 16K ram chips, (8 of them in a row near corner, not those 4 in two rows) and replaced them with new ones but it did…
... .
btw, what about upper RAM, could it be broken? I ... use the same chips for upper RAM?)
