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Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…
... wireless tape loading,
- 80K RAM; upper RAM can be paged in 32K ... -
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…
... will be using the lower/upper ram, lm1889 display, and rom ic ... -
Spectrum +3 not working [HELP]Hi, When i turn on my zx spectrum +3, im presented with a black screen with a solid green border all around it. Anyone here knows whats the meani…
[quote="Your Spec-chum;982380"]Ram failure of IC21[/quote]
There is no IC21...
RAM chips are IC3, 4, 5, and 6... -
Spectrum +3 not working [HELP]Hi, When i turn on my zx spectrum +3, im presented with a black screen with a solid green border all around it. Anyone here knows whats the meani…
... "][quote="Your Spec-chum;982380"]Ram failure of IC21[/quote]
RAM chips are IC3, 4, 5 ... . I still think this is ram fault though, although I haven ... -
Broken ram or what?Hi! I own ZX Spectrum 48K. When i run command PRINT PEEK 23732 + 256 * PEEK 23733, I should get answer 65535? But i get 49151. In my machine the upp…
... In my machine the upper memory chips are in ... correct because i now had 16K Spectrum.
So ... program which can test ram. It also says that ... machine has broken ram. And if i remove upper memory chips, ... is broken, where to find failure?
Thanks
ram unity for 16k allows also to plug a joystick?hello I?d like to know if a RAM interface for a 16k spectrum allows also to plug, together, a joystick? Thanks
hello
I?d like to know if a RAM interface for a 16k spectrum allows also to plug, together, a joystick?
ThanksDiagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …
... it may be an upgraded 16k model) that doesn't ... load of dots in the upper-half of the screen, then ... joints for the bottom-left RAM chips seem to be ... physically on the board which RAM chip the display attributes is ... on. This all points towards RAM for me - I don' ...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…
... which lost it's whole upper memory. It's worked okay ... another Spectrum which had also upper memory problems. So i ... result 32767. This mean that upper memory is off. I ... said that i have 16K Spectrum which RAM/ROM is in working ... .
Where is my upper memory?Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…
... whole upper memory. All diagnostic programs says that it's 16K ... model with working RAM. But I own ... 48K model with fault ram. After changing faulty upper memory chips they ... knocked off all upper memory? I know that when 16K machine upgraded ...Some stupid 16K questions...Starting with... 1. Should a 16K Spectrum that's been upgraded to 48K behave [I]exactly[/I] like a 48K Spectrum? i.e. should the machine test/clear…
... ...
1. Should a 16K Spectrum that's been upgraded ... /clear the entire 48K of RAM on start up, and should ... I expect to see the upper 32K RAM on such a machine ...+2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…
... quenstions about,
contended RAM are banks 1,3,5 ... 's (4164), so 1 pairs = 16k X 4 pairs = 64k
upper" memory with the same logic ...
now psysical, contended RAM are the IC's on ...ZX81 + 16K RAM PackUp for sale is a ZX81 packaged with power adapter, aerial cable, ear/mic cable and 16K RAM Pack. I hooked it up to the tv and although the power sup…
... cable, ear/mic cable and 16K RAM Pack.
I hooked ... am unable to test the 16K RAM Pack.
ZX81 + Power ... .jpg[/IMG]
Complete 16K RAM Pack:
[IMG]http://i629 ...16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... for the lower RAM that works in all 16K/48K Spectrums (I ... the column address to the RAM and so there isn't ... that appear on the lower RAM address lines. In particular, in ... is the ZX Spectrum Lower RAM Replacement Module, pictured below:
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…
... ZX81 with original PSU & 16k RAM pack actually worth here? If ...For Sale?? Offers? Spectrum ZX81, PSU & 16k RAMHi all I've got a ZX81, 16k RAM pack & original PSU here I purchased sadly it won't work with my TV and I don't want to hack it apart to make compos…
... /> I've got a ZX81, 16k RAM pack & original PSU here ...Wanted: ZX81 boxed with 16k RAM PackI'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D …
I'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D Monster Maze that would be the icing on the cake, thanks.Issue 1 16K RAM bankFolks, I recently had a chance to fix a couple of Issue 1 boards, and learned the hard way that the chips in the 16K RAM bank have a different place…
... that the chips in the 16K RAM bank have a different placement ... from 2 up have the ram chips lined up the most ... meaningless reports from the Fruitcake RAM tester, I finally checked all ...ZX Spectrum+ showing 16K of RAMHello again, as the title says my ZX Spectrum+ is showing only 16K of RAM instead of 48K when running a memory check. [url="http://www.1000bit.it/su…
... Spectrum+ is showing only 16K of RAM instead of 48K when running ... +, and not of an original 16K Spectrum.
That same page ... how to identify the faulty RAM chip, but I seriously have ...Sinclair 16k Ram pAck Issue3 schematicsHi guys, I am willing to repair a 16k ram pack for the ZX81 but I cannot find any schematic of the ISSUE 3 ram pack. I could only find a schematic…
... am willing to repair a 16k ram pack for the ZX81 but ... schematic of the ISSUE 3 ram pack. I could only find ... and replace them with 8118 ram which requires only +5V. Problem ... desoldering one of the 4116 ram, I lifted the tiny little ...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…
... handle the paging? 8K chunks? 16K chunks? Multiple 2K chunks mapped ... with RAM relocated to the ROM space? Use the existing 16K as ... other 48K into the final 16K of memory as 3 chunks ... of memory and leave the upper 16K for a "Normal" video screen ...Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... certainly the lower 4116 RAM. The ULA normally gets ... does so because the lower RAM went bad.
RAM. Refer to the diagram ... 's only 16K because it has an upper memory fault).< ... chips have quite a few failure modes - I discuss some ...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 …
... the most common failure modes of Spectrum RAM with that ... 4116 lower RAM) the most common failure mode is ... for bit fade, once RAM has passed the inversion ... fill tests, set the RAM for an inversion pattern, ... the lower 16K for the 4116 RAM, and the upper 32K for ...Hi everybody! Need help trying to rescue a ZX 48K...Hi, since this is my first post, a bit of info about me: I'm an Italian guy, now living in Poland (Warsaw), informatics and electronic geek since…
... /> The lower 16K RAM is more exposed to failure than the upper 32K block ... that some of the lower RAM is defective.
Check if ... any of the RAM-chips are hotter than the ... just have to replace the RAM and see if it helps ...Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…
... /Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm"]RAM test program[/URL].
... of dealing with a DRAM failure, is to remove all ... br />
If the upper 32k of RAM is suspected, you can ... try to operate as a 16k RAM only computer. You may ...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 …
... /> A 48K game or a 16K game will not (normally) try ... switching register. But the 16K of ‘lower’ RAM still comes from one ... 64K byte RAM chips, and the 32K of ‘upper’/‘expansion’ RAM still comes ... address range, if such a failure did occur, assuming the computer ...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 ... are already here to set 16K of RAM so 32K are enough ...RAM Music MachineBoxed RAM Music Machine Sampler (for 48K, Plus, 128K, Plus two) includes the tape, microphone, manual, even original mic stand! I last got this wor…
Boxed RAM Music Machine Sampler (for 48K, ... as I only have a 16K now.
However, I ...Boxed 32k Ram packPicked one up a few weeks ago at a car boot sale with a boxed 16k Speccy. Is the ram pack worth anything? Not seen any on Ebay. Thanks in advance, G…
Picked one up a few weeks ago at a car boot sale with a boxed 16k Speccy. Is the ram pack worth anything? Not seen any on Ebay.
Thanks in advance, GnormanZX-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…
... which is probably normal since ram
test takes a ... is original
Sinclair ZX 16k ram pack issue 3 .
ram pack :
... a posibility of faulty RAM somewhere on the lower ... even a possibility of 16k RamPack being OK and ...
