-
Ram test / diagnostic software for 128k?I need a ram test program urgently (as I have to bring this machine into the party place tomorrow) yet I couldn't find any in infoseek by typing "ram…
I need a ram test program urgently (as I ... any in infoseek by typing "ram test" :) And most of the ... .
Are there any ram test suite which runs from ... -
RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…
... other question is how much RAM is corrupted in page 7 ... paging/transferring/rebuilding pages in RAM), so the games are loaded ... -
Fastest Z80?Hi , Could somebody explain more about the Kawasaki Z80 33 MHz to me? Is it fully backwards binary compatible with older Z80s and could it be used a…
... MHz
? 64 KB RAM
? Single voltage
? 256 I/O ... -
maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …
What is the maximum addressable RAM for a Z80 using bank ... kB) are used as video RAM, but can be used for ... , the additional 64 kB of ram is mapped on pages 248 ... -
PlusD Mini: implementing the CPLDI am doing my first attempts on creating a CPLD to use as replacement for the PlusD's GAL (and other logic lateron). I use the Xilinx XC9500XL series…
... I added the 3.3V voltage regulator, wired the chip to ...
| f17);
// ROM/RAM select (PlusD paged in when ...
+ f17
;ROM/RAM select (PlusD paged in when ... -
+2 fried using the datacorder(Hi, first post here.) I just got hold of an extremely battered and bruised +2 sold to me for spare parts. As usual I plug it in, hook it up to the …
... either the ULA or some RAM that's bitten the dust ... it's fine. All the voltage lines are as expected. -
Spectrum 128k +2 grey RAMhi all, the manual say that ram ic's should be KM4164B-15P but when i open my spectrum (not repaired by anyone) the ram chips was KM4164B-12 is thi…
... />
the manual say that ram ic's should be KM4164B ... (not repaired by anyone) the ram chips was KM4164B-12
ram?
something else, ... 48k issue 2 zx with RAM chips IC 6-13< ... to remove all the 48k ram chips? it will not ... -
RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…
... try to diagnostic a probably RAM fault on my +2 grey ... have some new and old RAM ics KM4164B-12 [B]only ... i can identify the faulty RAM ic?
any tips will ... -
+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 ...
now psysical, contended RAM are the IC's on ... -
Flashing coloured blocks - diagnosisHiya, hope this is the right place for this... Was given an Issue 2 48K by a someone yesterday that hasn't been powered on in 20 years, which works …
... down to the voltage regulator, TR4 transistor, ULA, or RAM. I've ... into the Speccy), and the voltage regulator which gets 10.88V ... /> I've tried touching the RAM chips to see if heat ... -
ZX Spectrum Hardware Standards stickyHi I would like to propose that we add a ZX Spectrum Hardware Standards sticky. I should contain all the voltage, current, power and frequencies st…
... . I should contain all the voltage, current, power and frequencies standards ... for compatibility, e.g. compatible RAM manufacturer IC's, etc. Compatibility ... quickly lookup the acceptable supply voltage range of the +5, -5 ... -
Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…
... memory problem, hooked a ram tester loader with Paul ... me fault on video ram (blue border with 5 ... paper screen. Desoldered all ram and mounted turntip sockets, ... measuring voltages at the ram pins since I don ... with my working one that voltage on pin 9 (a7) ... -
Plus D Voltage Regulator OrientationHi, I?ve got a Plus D Disc Interface circuit board without case from a friend. Sadly he sends it to me without care for proper packaging. So it arr…
... arrived to me with the voltage regulator hanging around,
... sure about the orientation the voltage regulator was soldered.
... wrong.
The voltage regulator has printed "F M0247 ... must install a newly buyed voltage regulator.
... -
Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …
... soldered in, quick voltage test of lower ram checks out but TR5 ... -
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…
... , ear/mic cable and 16K RAM Pack.
I hooked ... unable to test the 16K RAM Pack.
ZX81 + Power ... [/IMG]
Complete 16K RAM Pack:
[IMG]http://i629 ... -
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…
... start running the voltage tests on the lower RAM with the computer ... , having tested all the lower RAM chips, and finding pretty much ... of replacing all the lower RAM chips, and then the ULA ... -
ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…
... read would indicate a lower ram failure. I have lightly touched ... seem cool.
The ram fitted is 8322 4116 2N ... -
4116 Ceramic Ram ChipsHi all, I have a few 4116 Ceramic Ram Chips to sell. If you have any interest, please PM. Greetings, Retrorepair
Hi all,
I have a few 4116 Ceramic Ram Chips to sell.
If you have any interest, please PM.
Greetings,
Retrorepair -
Anyone got any 4146 RAM chips?Hi I'm looking for some 4164 RAM chips, as would be fitted to a 128k Spectrum (+, +2, +3 I think they all use the same memory). Not out of a 48k mac…
... 'm looking for some 4164 RAM chips, as would be fitted ... -
quick RAM copy using LET in BASICI'm in the process of reviewing, revising and refining all the programming tips & utility routines which I've posted on this forum over the last eigh…
... an address (if referencing free RAM). Any string names can ... two different segments of free RAM). Although the routine will ... COPY string to RAM or RAM to string or RAM to RAM
GO ... or destin location if in RAM;
b$=source string expression ... -
ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…
... zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have ... zx.zigg.net/LRR/"]lower RAM replacement module page[/URL] and ... trailing wires, so the upper RAM module uses almost the same ... as the lower RAM replacement and emulates dynamic RAM.
... -
Rubber Key RAM - Repair?Hello there everyone! I'm a long-time lurker on here - ROMs, documentation etc. but yesterday I finally ponied up for my own speccy, just like the on…
... />
I carried out the RAM test I found elsewhere on ... -
Voltage converter question.I recently paid over $100 for a really solid nice looking 750 watt 110v to 220 v converter so that I can run some my UK appliances when they come ove…
... />
However, this second 'cheapo' voltage converter does not appear to ... any side effects with the voltage converter? -
Opus Discovery OddnessHi everybody, I'm busy trying to repair an Opus Discovery for a customer. It's proving to be quite frustrating. First off, the LM317T regulator fo…
... At which point the voltage plummeted back to 1. ... Disconnect the aerial lead. Voltage goes up to 5.0V ... /> Replace the aerial lead, voltage down to 1.6V. Completely ... a picture, but the voltage is still too low ... br /> A working 6116 RAM has been fitted (the socket ... -
Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …
I got my new upper ram replacement module from Zorn ... manages to boot, the ram passes the memory test i ... When I put the upper ram chips back in place, ... br />
The upper ram are not on the "OKI ... attempts DMA to the upper RAM and uses unusual timings ... -
Replacement Spectrum +3 RAM ChipsHi all Bought a +3 last week with a RAM issue, so I have removed the old chips, added sockets and now just need a full set of chips to get her back…
... +3 last week with a RAM issue, so I have removed ... -
POKEs on 128K "upper RAM"?I've been working lately with some 128k games, and I've got this question about RAM in games. I guess most games use RAM pages 5 and 2 to store the …
... 've got this question about RAM in games.
I ... guess most games use RAM pages 5 and 2 to ... the main program, and other RAM pages are used to store ... that needs POKEs placed in RAM pages 1, 3, 4, 6 ... -
Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... />
Update: #2 Lower RAM chips have voltage at:
-4 ...
