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Wtf??I won this NZ auction earlier this week [url]http://www.trademe.co.nz/Browse/Listing.aspx?id=116509561[/url] and have been to collect the hardware th…
... of any 32K chip (static RAM, EPROM, ROM, flash - whatever, it ... high when you want the upper half, A14 low when you ... -
At the Carboot sale today.Today at the carboot sale I picked up An Acorn Electron -I see these all the time, An Official Branded BBC Micro Datacassete Recorder - I'v…
... shortly after too (bad lower RAM). Before I repaired it, I ... machine's motherboard has bad upper memory and is currently on ... -
At the Carboot sale today.Today at the carboot sale I picked up An Acorn Electron -I see these all the time, An Official Branded BBC Micro Datacassete Recorder - I'v…
... shortly after too (bad lower RAM). Before I repaired it, I ... machine's motherboard has bad upper memory and is currently on ... -
A vexatious questionThis is kind of a follow-up to a question about RST #8 and hardware that I wrote in the development forum a while ago. To summarize that: certain ha…
... bus is for the upper 32K of RAM). But there's still ... -
Testing the Ram on a Toastrack 128KHi All My "new" 128K is misbehaving, all the demos I have loaded for it crash instantly, Ghostbusters 128K is playable but one of the background scr…
There is a 128K RAM testing ROM, I've got ... enough. There's many failure modes of RAM which that test will ... succeed (such as if your RAM has become a 1 bit ... have a discussion of Spectrum RAM faults online here (this concentrates ... -
Gamasutra article on the er.. other computer.I know that some of you own and love the c64 (heretics!). This article may probably interest you: [url]http://www.gamasutra.com/view/feature/1991/a_…
... working Spectrum (no case, no upper memory, issue 4 board), and ... hard disc and extra sideways RAM, the other with a plain ... -
Changing the colour of the loading 'stripes'I was wondering if it were possible to alter the default colours of the standard ROM loading 'stripes' via BASIC, mabye a POKE command of some descri…
I'd also like to point out that to get the ROM routine working properly from RAM it needs to be in the upper 32K of memory. -
Changing the colour of the loading 'stripes'I was wondering if it were possible to alter the default colours of the standard ROM loading 'stripes' via BASIC, mabye a POKE command of some descri…
[QUOTE=ghbearman;227871]I'd also like to point out that to get the ROM routine working properly from RAM it needs to be in the upper 32K of memory.[/QUOTE]
Why is that? -
BBC MicrosAny speccy peeps on here also have a collection of Beebs ? :) I have a fair few (and some accessories) , il try to get some pics later if anyone is …
... out both the upper and lower portions or Ram to see if ... -
Free speccyAnyone want a speccy plus with leads and psu for free? I was going to do the comp mod on it so pulled it out to run it up before i started and it's d…
... - it's exhibiting some 'interesting' failure modes :-)
First off ... be a problem with lower RAM - but the bizarre thing is ... an artifact of how lower RAM has failed; the diags board ... way through (showing a lower RAM problem), and even run the ... -
DRAM (:baffled:)Hi, Can someone explain to me the definitive rules on DRAM access times in terms of suitability for a particular speed of processor? Specifically, …
... 48K Speccy. Replaced too upper 32K RAM with one 32K SRAM chip ... .
Upper was piece of cake ... , but lower RAM (what is ... -
Spectrum Dead On Arrival StatsDr. Rupe, who worked at Sinclair Research at the time, sees parallels with Microsoft and the XBox saga [url]http://community.zdnet.co.uk/blog/0,1000…
... strong ones in the upper reaches of the failure distribution curve and ... -
Spectrum Dead On Arrival StatsDr. Rupe, who worked at Sinclair Research at the time, sees parallels with Microsoft and the XBox saga [url]http://community.zdnet.co.uk/blog/0,1000…
... most common failure mode seems to be bad 4116 RAM, I've ... amounts of moisture leading to failure; this isn't something Sinclair ... fixed though, just fit new RAM. Design flaws such as unrealistically ... -
sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …
... . I wouldn't replace these RAM chips until the power circuit ... upper bank. Traditionally these are 64Kx8 chips with half of the RAM ... -
DivIDE+ and 128K HeatsinkI got my DivIDE+ yesterday and i tried it on a 48K+ at first, it worked marvelously on it, no problems at all. Today i desided to try it on my 128 H…
... coil on it on the upper right corner that i haven ... timings in the heatsink's RAM (on some of them of ... -
Punch up! Bruce Everiss mauled by the internet over why Imagine collapsed.I couldn't see this posted here so I thought I would post it. It kept me amused for at least half an hour. Bruce Everiss on his blog claims piracy br…
... " was nothing more than additional RAM (or ROM) because that was ... published to cushion any potential failure) and it was going to ... that brings reward rather than failure. Well, if taking huge risks ... -
'orange' on a spectrumalways wondered why spectrums could never seem to achieve the colour orange? wasn't one of the default colours, and don't remember seeing anything th…
... the screen2 in the upper 16K of RAM, so we can access ... ]scrcopy[/b] Copies current screen RAM into second screen (Very slow ... -
'orange' on a spectrumalways wondered why spectrums could never seem to achieve the colour orange? wasn't one of the default colours, and don't remember seeing anything th…
... whichever screen was paged into upper memory.[/QUOTE]
Yes ... statement to print to the upper memory screen.
From ... so called "silicon disk" or "ram disk" however, the command syntax ... -
WTF is this???[url=http://cgi.ebay.es/Spectrum-128-Emulator-ZX-Interface-2-ROM-Cartridge_W0QQitemZ170254558796QQihZ007QQcategoryZ50223QQrdZ1QQssPageNameZWD2VQQcmdZ…
... doesn't add 80K of RAM et al. merely 128K BASIC ... of ram disc in the upper end of the normal 48K RAM.
RAM - especially as the guy who ... -
Black ScreenHi, Anyone know what would cause a 48k Spectrum to boot to a black screen? you can hear the internals buzzing at power up, but you just get a black…
... black screen as the RAM defaults to zero.[/QUOTE]< ... br />
The RAM defaults to a fairly random ... vomit' on turn on). RAM is cleared down to zero ... br />
If the RAM is faulty, it depends how ... failure modes so really you have to test the RAM ... -
Custom SAVE Routine work on emulators?Hi, I'm developing a SAVE routine derived from the one present in ROM 48K, and I'm trying to get it work on several emulators (X128, Spectaculator, …
... also place the routine in upper memory (8000h+) as the first ... priority on reading the lower RAM over the CPU. -
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://…
Well, I repaired a Issue 2 Speccy putting 4164 chips on the upper memory, so I have a 80K RAM Speccy ;-) -
4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
... replacing it with a static RAM (32K x 8 bit, only ... multiplexed address bus for lower RAM, so I connected an 8 ... reads / writes to the lower RAM. Snow gone, normal operation 100 ... go. Next I replaced the upper 32K with another single SRAM ... -
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... machine stack in the upper part of RAM. Overwriting that will also ... brief search, I found two RAM-testing programs today written in ... /> No doubt there are more RAM-testing programs out there.
RAM (like the system variables), test ... -
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... tests the lower 16K of RAM. (Select (S)OAK test)
The second program tests the upper 32K (both use a machine ... be suitable for testing the RAM of any 48K speccy. -
4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
The 4116 RAM usually causes it, because it' ... test on startup. If the upper 32K has a fault, sometimes ... left of the PCB. The upper 32K is in two rows ... -
1K Minigame : 3D RacerLast year I started to code a 3D Racer in 1K. The print of the road was however quite flickery so I put it away to pick it up this week again. I deve…
... game is 48K. It uses upper memory for speed.
RAM and alter it on the ... -
issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…
... " from the screen to the upper memory. As the Spectrum enters ... writes certain values to the upper memory. Because the resistors are ... data coming from the lower RAM to the ULA. When the ... values back out of the upper memory. But you'll find ...
