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If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... machine with 80k bytes of RAM (imagine the marketing, more ... dump the 4116 (or equivalent) lower RAM chips. Which is where the ... />
If you retain the lower RAM, and use 64k bit DRAM ... for the upper RAM, you get: 16k (lower RAM) + 64k (upper RAM, some of ... -
Speccy 4A board problemHi all. I was hoping for some help with my Speccy (with 4A Board) before I send it off for repair. When I power it on all looks fine (i.e. copyright …
... it does not have enough RAM to run :-(
... could be a RAM fault, most likely the ‘lower’ RAM (4116 or equivalent ... corrupted due to faulty ‘upper’ RAM.
The quickest and ... try to eliminate the ‘upper’ RAM, you could disable it. Then ... -
upper ram tacks / TR4 socket...[url="https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7"]https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7[/url] you can only replace that pesky TR4 so many t…
... does not care about the lower RAM, it will just grab whatever ... program does need some working RAM...
If there ... want to use a upper RAM replacement module. But before ... broken connections), all the wanted RAM address lines are connected and ... -
doubt about swapping ULA in an issue 2 boardIs it possible to swap a 6C001E-6 ULA type with a 5C112E ? I have this issue 2 board that is not booting, it shows me a black border with horizont…
... DiagROM gives me lower RAM errors, it says all lower RAM is faulty, or ... at the 7805.
RAM IC's are MM5290N
I replaced just one RAM with a modded 4164 ( i ... still shows me an entire lower RAM failure.
I'm ... -
Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…
... the Z80 writes to the ‘lower’ RAM area to generate it’s ... -
Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…
... refresh of the 16K byte ‘lower’ RAM did not work as intended ... obviously worked, even if this RAM was only being refreshed by ... and the Z80 accessing the RAM, they did not try to ... -
Anybody got a parts list for an Issue 3b please?I've got a schematic, but does anyone have a parts list with the values just for the resistors and capacitors? Just would save me sometime going thro…
... you use a lower ram board or mod 4164 ram you could do ... -
16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…
... power circuit .. and either a lower ram module replacement or some 4164 ... ram with small mod so the ... -
what soldering / disordering equipment do you usemy experience with zx spectrum / amstrad cpc boards 1.cheap solder braid (not good) need to try some better, any recommendations when i looked i go…
... small door ..its removing them lower ram chips that i have to ... -
Are 128K games more likely to crash than 48K ones?Hey, guys. I've been doing some experimenting with various games and even some music demos and apps, and I'm beginning to reach a conclusion that …
... switches ROM and/or RAM banks into/out of ... . But the 16K of ‘lower’ RAM still comes from one set ... 32K of ‘upper’/‘expansion’ RAM still comes from the other ... set of 64K byte RAM chips.
... to load in a diagnostic/RAM test program.
Max RAM for ZX Spectrum gamesHow much RAM can be used for single level/whole game? On tape writing.
... between contended and uncontended RAM is a hardware thing.
RAM there is. This RAM is often known as the ‘lower’ RAM.
RAM. This ‘upper’ RAM is uncontended. The Z80A ... /> In the 128K models, the ‘lower’ 16K which has the screen ...ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... original
Sinclair ZX 16k ram pack issue 3 .
lower with POKE 16389,n ... lt; 77 (76 and lower) and then do NEW then ... free (RAMTOP lower than ROM + 3.5k of RAM) then ... a posibility of faulty RAM somewhere on the lower
addresses ? ...SRAM replacement for lower 16KSome time ago I wondered if it were possible to replace the lower 16K RAM of a 16K/48K Spectrum with a single SRAM chip. You know, those pesky 4116 D…
... were possible to replace the lower 16K RAM of a 16K/48K ...How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…
... the first K of ram to video memory and ... cant also read the lower addresses at the same ...
The spectrum has its lower 16K separated from the higher ... is accessing the higher order ram (> 16K) the ULA ... data. Thing is the lower chip only needs to be ...Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic. Given…
... />
Given that the upper RAM in a Spectrum is of ... the 4116 in the lower portion of RAM?
Surely it ...ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…
... requires. I've seen composite mods are possible but to be ... with original PSU & 16k RAM pack actually worth here? If ...Paging for 64Kb of Video Ram??? What is the best way to page this?Hi all, I'm just putting together a concept card for a "Loki" style of video card, which supports shadow ( so it fits a normal Speccy ) and also t…
... single 48K video page with RAM relocated to the ROM space ... or 512x192 ) to occupy the lower 48K of memory and leave ...Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…
... because, apart from these superficial mods, the 128K ULA is identical ... [QUOTE=csmith;506356]
The RAM bank switching is entirely handled ... contended), and the 32K RAM with another 64K memory bank ... interested in knowing how the lower bank in such a layout ...A thousand core CPU?Maybe this is old news to most people on here, but according to: [url]http://www.zdnet.co.uk/news/emerging-tech/2010/12/25/intel-why-a-1000-core-chi…
... had more than 64Mb of RAM as standard anyway. There's ... out some of my PCs RAM".
And as ... was stripped down with lower quality textures and lower polygon counts.[/QUOTE ... multitasking, high resolution for games, mods (:-(), etc.
...A thousand core CPU?Maybe this is old news to most people on here, but according to: [url]http://www.zdnet.co.uk/news/emerging-tech/2010/12/25/intel-why-a-1000-core-chi…
... comparing a game with much lower resolution, lower quality textures, and much ... a marginally higher requirement for RAM due to having a general ... a total of 64MB of RAM distributed in any way you ... , and you can use user mods with them. On the minus ...which zx-spectrum games uses 1bit sound samples?hi! I'm looking for zx-spectrum games using 1bit sound samples. Compairing with msx, which has far less games available than zx-spectrum, there are f…
... will also take up more RAM for any sample :-P
Edit: SampleTracker plays 4-bit mods through the speaker and it ... frequency from a 11kHz or lower sample-rate, and of course ...Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... all the support TTL and RAM chips in my IC tester ... are working.
The lower memory can also be the ... with the suspect set of RAM chips, it means that one ... (1,2,3, etc). The mods is described on a few ...First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... or order one of zorns mods for lower rom. I see no ... do I disable the upper ram? Cut tracks? Ill take a ...Jiiira's Sparrow LITEHi All, Just for info .. :) big eprom, cheap 32KB ram and etc. i don't know specification .. :) https://youtu.be/NbI7E1aebrM modern speccy .. …
... signal transistor in metal can (lower left corner)? That's sooooo ... Speccies result from dying old RAM chips (lower 16K in particular).
mods on an original Sinclair board ...Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…
... the fact that the lower part of the RAM is slower because ...How do I know the RAM size?Just left my parents after cleaning out my pile of old stuff in their basement. Know what I found? My old ZX Spectrum.... Those were the days! Never …
... ZX81, though.
3K om RAM, my friends!
My question ... I tell what size of RAM I've got in my ...HELP 4532 or 4864 RAM wanted !Hello My real spectrum fell off yesterday I know that one RAM memory chip is out of order There was 8 X HM4864P-2 but I saw in the Spectrum schemati…
...
I know that one RAM memory chip is out of ... here to set 16K of RAM so 32K are enough to ...
