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UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.
... as the ULA is accessing lower memory). Replacing resistors isn't hard ... output impedance of the 4116 memory must be quite high if ... -
Disable onboard memoryWould this work...? Access to onboard I/O can be disabled by holding IORQGE high. Would it be possible to create a MEMRQGE in a similar way to disa…
... and instead, select your external memory on /CAS). The /RAS ... each row). The 4116 memory only reads or writes ... to still comply with memory timings for when /CAS ... using the on-board lower memory. Note the 2 NAND ... about when paging out lower memory is that all of ... -
Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... look would be bad memory.
Lower memory is most likely the ... -
Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... look would be bad memory.
Lower memory is most likely the ... -
Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... ve got a duff 4116 lower memory chip. If you have ... mode that the Spectrum's memory check picks up).
... voltages are getting to the lower memory - a bad power supply ... can also kill lower RAM, and it's ... all present on the 4116 memory (if you have a ... -
Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... voltages are getting to the lower memory - a bad power supply can ... also kill lower RAM, and it's a ... all present on the 4116 memory (if you have a dig ... -
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, …
... refresh time for the 4116 lower memory - they just got away with ... it, that's all. Other memory might not be so forgiving! -
Firefox 3.0 Final todayFirefox 3.0 Final will be released today at 6pm (GMT). Mozilla want to set a Guinness World Record for the most software downloaded in 24 hour. A n…
... ?
Extra speed and lower memory usage just aren't issues ... -
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 …
... will overrite all the computer memory, including the basic program! Try ... running it for upper memory only - 32768 to 65535. Not ... to 32767 to try the lower memory. 16384 to 23295 are probably ... -
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 whole bank of 4116 memory with a 30 pin SIMM ... memory.
[url]http://www.zxprojects. ... .php/simm-adapter-for-replacing-lower-memory[/url] -
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 whole bank of 4116 memory with a 30 pin SIMM ... memory.
[url]http://www.zxprojects. ... .php/simm-adapter-for-replacing-lower-memory[/url][/QUOTE]
*gives ... -
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 whole bank of 4116 memory with a 30 pin SIMM ... memory.
[URL]http://www.zxprojects. ... .php/simm-adapter-for-replacing-lower-memory[/URL][/quote]
Is ... -
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?
Not a schematic but a board layout is on those pages as well:
[url]http://www.zxprojects.com/index.php/simm-adapter-for-replacing-lower-memory/13-making-it-pretty[/url]
Frans:-D -
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…
What was the best 16K Spectrum GameOK, I'm putting up a poll, but its not really about the poll, but a chance to focus on the 16K gems. (The poll, taking those with the best WoS rating…
... they relocate into the upper memory for extra speed.[/quote]
memory and the variabels also. When ... I relocate the code to lower memory, but the variablestorage is kept ... in upper memory.
Therefore it will ...issue 4s for reapirHi All, This time I have issue 4s for repair :) Here is few screen shots and small movie after boot. [url]http://forest.no-ip.org/issue4s/[/url] I kn…
... is solved!
3 bad lower memory chips
now i have ... sockets for cpu and lower ram :)
result pictures here ...not much gear and absolutley no ideaIm looking for some help with two spectrums that i have just dug out of storage and are both unfortunatley faulty. I had always regreted that during …
... it is almost certainly bad lower memory and possibly the internal power ... the lower 16K of RAM will have died too (the memory needs ... the voltage regulator) then the lower memory dies.
There are ... is good, but the 4116 memory is probably bad. This is ...Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…
In general "no video but keyclicks" suggests absence of 12V.
This voltage is generated inside the Spectrum, together with -5V for lower memory. Absence of these voltages might (will) damage lower memory.Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…
... Spectrum, together with -5V for lower memory. Absence of these voltages might ... (will) damage lower memory.[/QUOTE]
could this ...Black screen of deathI recently aquired a zx spectrum (revision 3b) of the rubber key variety. it was all running smoothly(for about an hour after pluggin in), i left the…
... the loading etc tells that lower memory is working, then voltages eventually ...Two dead SpectrumsHi all, Long time since I posted on here. I'm having a bit of a clear-out, and I've re-discovered two Spectrums I had in the loft : One is an orig…
... of 10 it's the lower memory. There are some easy checks ... supply dies, then so does lower memory - if you read the 4116 ... more of the chips in lower memory (the 4116 RAM) has failed ... ]
which will test memory, and do some functional checks ...Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…
... ) is a sympton that the lower memory is not working at all ... ULA wants to read that memory to build the picture, it ... : check the voltages at low memory (5V, 12V, -5V) and see ...Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…
Search this forum for the TMS4116 datasheet, it has the pin outs of the 4116 memory which is the easiest place to test for the correct voltages (this is lower memory). There's a link to the data sheet in one of the threads.Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…
... .php/simm-adapter-for-replacing-lower-memory/12-a-direct-wired-prototype ...Snow on screen of 48K Speccyok you wizards I fixed up my 4116 ram issue as Winston and McLeod advised me before by replacing with 4164's.... all I could find here in Singapore (…
... when using different types of memory (the ones that divide the ... the data output of the lower memory.fragged spectrum +I know I only bought it a few days ago. short version : I damaged it via a wonky RAM joystick box, suffering from ram pack wobble .. no sinclair mes…
Likely at least lower memory, possibly the ULA too (although ... - but most times, it's lower memory and the small switch mode ... search on this forum for "lower memory" and "4116" and "voltages" and ...Spectrum 48k Fault - anybody seen this before?Hello, I have two 48k spectrums that exhibit the same fault. Black border, paper area is full of columns of wavey lines. I have posted a screen sho…
... ;
Likely at least lower memory, possibly the ULA too (although ... - but most times, it's lower memory and the small switch mode ... search on this forum for "lower memory" and "4116" and "voltages" and ...using ic/chip holders ?advisable or not to put them in an original spectrum? I mean to save soldering in the future, if I'm gonna be having the machine fixed. I saw them …
Sockets are good. Use them. (Especially for lower memory, which is particularly flaky).just thinking about ...compo for zx 16k ? anyone ?
[QUOTE=Fikee;402570]yes, the target should be bare 16k Spectrum (no disk, no ay, no new ula or whatever).[/QUOTE]
In fact a MiniGameCompo for ZX Spectrum only (with coding in lower memory).just thinking about ...compo for zx 16k ? anyone ?
[QUOTE=Dr BEEP;402576]In fact a MiniGameCompo for ZX Spectrum only (with coding in lower memory).[/QUOTE]
MiniGameCompo has limit of 4K, good for VIC but not for ZX 16k
