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Video failureHi i cant find the failure of my spectrum 48k issue 4a, i thought it was ic6 or ic13 but the memory seem to have the right values. When i turn it on…
... 'll go for faulty upper RAM disrupting the initialisation.
RAM and so the ROM code will ... lower 16K of RAM. The output of the voltage regulator or pin ... 'd try removing the upper RAM ICs.
As always ... -
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…
... I'd suspect faulty upper RAM. Try the following to ... 16K Spectrum. If not and in the absence of an ... to remove all the upper RAM ICs.
" ... RAS signals for the upper RAM and so the ROM code will ... lower 16K of RAM. The output of the voltage regulator or ... -
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…
... I'd suspect faulty upper RAM. Try the following to ... 16K Spectrum. If not and in the absence of an ... to remove all the upper RAM ICs.
" ... RAS signals for the upper RAM and so the ROM code will ... lower 16K of RAM. The output of the voltage regulator or ... -
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…
... I'd suspect faulty upper RAM. Try the following to ... to remove all the upper RAM ICs.
" ... RAS signals for the upper RAM and so the ROM code will ... lower 16K of RAM. The output of the voltage regulator or ... locked on the black screen and it went to (c) ... -
Born again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…
... very first byte of upper RAM and sometimes that is enough to ... if it detects all upper RAM is faulty). However, I ... bit 1 of all upper RAM and your test does suggest ... O circuit cell gets damaged and then there isn't ... has applied too high a voltage to one of the ... -
PlusDlite problems with 128K modelsLast year I developed the PlusDlite, and already shipped out a couple of them. Only recently I discovered some problems with 128K models. I remember…
... signal differences between the 48K and 128K that could cause the ... on a TTL chip, and checked minimal voltage for a 27C64 ROM ... removed the PlusDlite's ROM and RAM and disconnected /CSROM.
This ... responding to address 58 (#3A) and 102 (#66), the boot ... -
Faulty 48+Hi I picked up a pile of Spectrum kit including a boxed "untested" 48k+ The Speccy boots to this screen... [IMG]http://www.scotek.net/zx spectrum/…
Thanks Balford,
I'll get some new RAM and run voltage checks.
Image of interface added above. I've been trying for an hour to edit/reply... So slow. -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... You can swap the RAM chips and see if the same ... .
And measure the voltage - it should be 5V ... at 74HC00 between pins 7 and 14.
...
I think the RAM has gone, same problems with ... mine. I'll get the RAM and ask for professional help - ... -
Help put this back to 16kSo this issue 2 arrived today and ive opened it up just to nosey and confirm that infact it is an issue 2. Now from the help offered in an earlier po…
... circuit is switched off and capacitors have had time ... believe it can measure voltage and current without a battery.)< ... of TR4 & TR5 and the inductor coil. Replace ... remove all the lower RAM and re-check the power ... or a lower RAM module and hopefully it'll ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... as there'd be noticeable voltage differences on the edge ... connected to two devices: upper RAM and ROM. The address bus is ... to two devices: ROM and multiplexors, and some control signals such ... put buffers between address, data and control signals from the CPU ... -
not working issue 3Hi all, I received this mobo from ebay, after start i have this on screen [img]http://forest.no-ip.org/wos/issue3_01/20150728_135908.jpg[/img] …
... failed or missing lower RAM and that's not surprising ... possible other components in the voltage converter circuit have failed, ... checking the diodes in the voltage converter circuit too.
... Check TR4, TR5 and the diodes in the voltage converter circuit.
Grey +2 - DOA and no power lightTook a punt on a grey +2 at the weekend to be a spare. It was "untested" although so were all my other +2's which are all fine. Tried to power th…
... another PSU), killed the 78S05 voltage regulator. Sometimes a 78xxx ... pin of the 78xxx type voltage regulator goes open circuit ( ... longer correctly control the output voltage, which will rise to ... working, if the Z80, ROM and RAM and ULA are working, pressing a ...Non working issue 3BGuys Hope you can help me here (or maybe, someonene from Europe could take a look at it? I've already tried different ULA, CPU, ROM and low RAM (…
... is the supply voltage. Yes, the fault finding guide and the schematic ... is to disable the upper RAM and then see if it will ... a 16k byte RAM machine. I will go and find a link ...What % of WOSSERS use "old school" tape loading when playing their Speccy games.My guess is .000000001% ( but I might be slightly out on this! ) Do people still enjoy doing it "the old way"?
... or interfaces) and will vary if the mains voltage varies. Hence ... PSU. It then limits the voltage and outputs a nice smooth, regulated ... the CPU, ULA, ROM, upper RAM and the logic chips all need ... difference between the input voltage to the 7805 and the 5V output ...My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …
... at 6mhz, 128k Ram and will run all Spectrum and ZX81 games.
Solution for overwritten stack in 48k SNA filesIt has been known for quite some time now that the 48k SNA file format has one serious fault, which is described in the file formats section on the W…
... data (or program code) in RAM and therefore the snapshot doesn't ... the programmers were using RAM much more carefully and they have often ... in 49179 bytes of registers and memory, pops the program ... correctly - I have tested some and found no difficulties.
< ...Can somebody help me with this?One of my "friends" shoved a piece of metal into the back of my spectrum (48k RAM) and now whenever I try to use it theres nothing but weird lines an…
One of my "friends" shoved a piece of metal into the back of my spectrum (48k RAM) and now whenever I try to use it theres nothing but weird lines and squares can anyone help!!??
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RjLooking for a DOS version of an EmulatorJust yesterday I got myself a laptop from ebay. Nothing too racey - just a P133 with 40mb RAM and a 4.3gb hard drive. At the moment I can't install…
... - just a P133 with 40mb RAM and a 4.3gb hard drive ... the ones in the archive and I'm just not happy ... full stop. It was Z80, and it came on the front ... out after 10 minutes play, and had more options open. Although ...A great ROMBack in the early 90s my ZX clone (called "Cobra" if anyone's interested) had a sort of a "SamRam" (actually an alternate ROM accessed via a NMI) tha…
... , the disassembler and monitor used very little RAM and you could load ... even the most heavily-protected program and ... downloads regarding this great ROM and was surprised to find ... the commands with their params, and even (!) some of this ...Where to find components, tools etc ?!I think i'm not the only one spending a lot of time surfing the net for components etc for Spectrum Hardware projects. Some component's are not manuf…
... manufactured anymore and almost impossible to find and others are ... !!! Also nice prices on GAL, RAM and EPROM.
// [url ... com/[/url]
Zilog and Cypress components that could be ... - CF connectors
- Altera FPGAs and high end CPLDs (Not std ...Universal disk drive controller project - information needed! Hello Speccy world! I am a hardware developer from Russia and old Speccy fan. Currently i am starting a project aimed at joining Western and Easter…
... with Beta128 at hardware level and compatible with other disk ... change ROM entrypoints) and 16 kb RAM to existing Beta128 controller ... operating systems (like MDOS3 and ResiDOS). It will not ... with floppy images stored in RAM and requires 1024kb of memory. ...Universal disk drive controller project - information needed! Hello Speccy world! I am a hardware developer from Russia and old Speccy fan. Currently i am starting a project aimed at joining Western and Eastern…
... with Beta128 at hardware level and compatible with other disk ... change ROM entrypoints) and 16 kb RAM to existing Beta128 controller ... operating systems (like MDOS3 and ResiDOS). It will not ... with floppy images stored in RAM and requires 1024kb of memory. ...Graphic issues with SpinOk, I've always meant to get this sorted out but never did for various reasons that I don't remember at the moment. I get choppy framerates with Spi…
... scanlines, multi-colour effects, smoothing, and enable/disable (no diff) full ... screen and auto-skip. No diff if ... XP 2.8Ghz, with 512MB Ram, and an ATI Radeon 9600 AGP ... with 128MB Ram. Latest directX (9.0c) installed ...Method to read byte as binary string rather than dec?Hi all Am fiddling around with the screen buffer and have written a routine to scan the screenbuffer into upper ram and then write it back in upside…
... scan the screenbuffer into upper ram and then write it back in ... buffer to store the 0 and 1s which I could then ...PC problem - my new motherboard won't turn off when in WindowsMy PC died, so I've bought a new motherboard, CPU, RAM and case. It's now an AMD 3100+, 512MB DDR, with a Winfast 760GXK8MG motherboard ( [url]http:/…
... bought a new motherboard, CPU, RAM and case. It's now an ... LOCK, CAPS LOCK and SCROLL LOCK) briefly flash, and that's it ... running as normal.
And if I shut down by ...Which Linux distro for low end PC?Hi, I have a low end PC knocking about which I want to turn into a fairly simple and secure granny PC for surfing, email, odd word doc etc without h…
... turn into a fairly simple and secure granny PC for surfing ... PII 500MHz with 256MB of RAM and a HDD that isn't ... (typing this on it now) and it seems to run reasonably ... IMO. Ubuntu was too slow and I couldn't find out ... this is for my mum and she's never driven a ...Anyone who knows Linux?Are there any Linux users here who have Unreal tournament? I don't know anything about Linux, but I've just downloaded an .iso of it, as I want to pl…
... only used to Windows, and have never used Linux ... XBox can run Linux, and I know that the Windows ... /[/URL] ).
And there are several versions of ... (shared with the video RAM), and I don't think any ... under Windows, of course), and UT has a (very good ...ANN: Spectrum Host 0.40 for BBC BASICZXHost 0.40, the ZX Spectrum host for BBC BASIC now has working microdrive support. You can load, save and catalogue microdrives, and any other devic…
... . You can load, save and catalogue microdrives, and any other device that ... include BBC BASIC runnable in RAM and colour mapping extended to include ... FLASH and BRIGHT .
See [url ...upgrading graphics cardhiya! Im looking to update my graphics card on my PC to something a bit better, I havnt got a lot of money so I was wondering what a good option woul…
... 4 at 2.8, 1G Ram and a Geforce 6200 with 512meg ... got a AGP mother board and was thinking of a Geforce ...PlaystationCan anyone reccomend a good playstation emu the ones I've tried run my discs (yes I am using my originals not images) really quickly then freeze up. …
... /4 of a gig of ram
and a Ati radeon 9550 ...
