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Blowtorch method of Speccy repairsI just did my first Spectrum repair (and successful at that). It was the Issue 2 spectrum I wrote about a while ago, I just hadn't got around to doin…
... Sinclairs test program.
It performs tests on keyboard, sound, ULA, RAM ... or 128 ) so you can test Z80's M1 line (NMI ... all tests on Sinclair's test program) and when i pressed ... -
128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
If the ULA is dead (or "wrong"), you ... always tell though since the ULA is responsible for so many ... a +2 ULA into their toast rack 128 and test the damn ... -
Did I killed my Speccy ???Hi guys, 1 minute ago I was working on my 128 +2A... But I made a mistake : I cut the gound on the PSU plug of the computer, and I forgot to resolde…
... you've taken out the ULA chip too, in which case ... a replacement part for that ULA and you certainly won't ... SRAM that I need to test. All the smaller DIP packages ... even if you get the ULA off there's the problem ... -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... ) nutshell:
Change the ULA.
If no picture ... after modulator swop, recheck the ULA and change TR1/2 (replace ... with BC547) if ULA ok. Change the LM1889 if ... known good RAM, test removed RAM.
Test and replace the ... -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... />
I also pull the ULA out because I get the ... . This will work as a test in the cases where upper ... to at least test all of RAM and the ULA in cases ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... you haven't damaged those ULA chips.
PM me ... ) nutshell:
Change the ULA.
If no picture ... after modulator swop, recheck the ULA and change TR1/2 (replace ... known good RAM, test removed RAM.
Test and replace the ... -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... the ula. Do you guy's know of a trustworthy test that ... you can do on the ula to ensure ... -
What's the most probable......cause for this on a grey +2? (z80 is excluded) [url]http://img376.imageshack.us/img376/8087/plus2hk9.jpg[/url]
... that, what should be next? ULA? PCF1306P...?[/QUOTE]
The ... ZX84 standard cell.
ULA - only sure source is a ... too - I think you can test a 128 Toast rack ROM ... -
What's the most probable......cause for this on a grey +2? (z80 is excluded) [url]http://img376.imageshack.us/img376/8087/plus2hk9.jpg[/url]
... and it started running the test and it ended like this ... below. I did swap the ula from another dead grey 128 ... -
Problem with my speccy 48+My machine boots up but apon booting it freezes and you can see feint grey horizontal 1 pixel lines going down the screen. Is this fixable at all?
... a thermal fault, could be ULA, Z80, ROM, RAM (etc etc ... . Replace this component and re-test the compyter.
2 ... -
Amstrad +2 Diagnostic BoardCan anybody help I wish to buy the Diagnostic Board that connects to the I/O strip at the back of the Amstrad ZX Spectrum +2. Many thanks Martin
... 8 LEDs, so the memory test can be completed, and that ... use screen RAM or the ULA
* ability to program the ... -
On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
[QUOTE=DEATH;179569]Also test the power supply transistors ... RAM?
Test TR3, that'll make the ... gone.
Test IC28 74LS04 too.[/QUOTE]
ula, logic and mem and ... on the z80, rom and ula. Everything is ok.
... -
On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... entire bus back to the ULA and CPU and supporting logic ... job to go through and test it all. (I know, I ... -
On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... ram ic to rom, logic, ula and cpu. Every friggin track ... .
I did also test the tracks of upper ram ... -
It's fitting...... that in the very month that the 25th anniversary of the Speccy falls on, I'm just finishing up making my first ever Spectrum peripheral. It's a …
... worked out what your "memory" test is going to do (i ... plans do you have for ULA testing?
[QUOTE=Marcelo ... -
Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…
... RAM, the best place to test them is actually still on ... uses LEDs so if the ULA is also toast, you can ... -
Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…
... testing the routines. The memory test code itself runs entirely in ... the RAM - but not the ULA since this controls the Z80 ... -
New Spectrum projectsI know that someone started a topic very similar long ago ( I think It was Tony), but its been a while since it was replied, so It would be nice if e…
Well, I'm making a hardware project to help diagnose dead Spectrums (so as to help bring more of them back to life). So far, the memory tester is done, need to now add code to run a CRC on the ROM and test various ULA functions. -
New Spectrum projectsI know that someone started a topic very similar long ago ( I think It was Tony), but its been a while since it was replied, so It would be nice if e…
ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... you sure you need a ULA chip - they are quite reliable ... scope to test it but i've 0V on ULA pin 39 ...128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
... a +2 ULA into their toast rack 128 and test the damn ...128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
... +2 ULA into their toast
>rack 128 and test the ... in 1985) has a AMSTRAD ULA. I remember it broke when ... issue 9G) that have this ULA.
You can see ...128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
... the [b]Grey +2[/b] ULA is compatible with the 128k ... /> Have you tried the 128k 'test'. With the 128 plugged in ... see vertical colors (during the test)...hopefully ;)128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
... the [b]Grey +2[/b] ULA is compatible with the 128k ... /> Have you tried the 128k 'test'. With the 128 plugged in ... test)...hopefully ;)[/QUOTE]
Grey +2 board: (see the Amstrad ULA ...128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
... 1985) has a AMSTRAD ULA. I remember it broke ... s nice to see AMSTRAD ULA in 128k speccy :) We ... Sinclair takeover has repainted ULA's with their logo ... you tried the 128k 'test'. With the 128 plugged in ... 2 board: (see the Amstrad ULA chip, same 40056 number) < ...ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... a fair price for a ULA chip?
Think about ... if the ULA is any good, so you have to test it ...ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... that 20 quid for a ULA is extremely expensive...
... is too much for a ULA (plus postage).
And ... the other parts, just the ULA chips, so that particular ... a fair price for a ULA chip - considering that the ... other bits, has to test the chip before he pays ...ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... a fair price for a ULA chip - considering that the price ... the other bits, has to test the chip before he pays ... right now, who wants a ULA chip for 5 GPB, I ... not respond" is not a ULA problem (but it probably is ... would sell more of them (ULA's) if his price were ...Running code from the display memory?Is it possible to run machine code from the memory area used by the display file? If you were really out of memory and some part of screen is not u…
... score for each opcode (each ULA type has different contention points ... contention is [B]only while ULA accesses PAPER. [/B]Therefore in ... to +3.
Some real test would help.Growing up... Jasmin supports 128/+2 nowHi, all. New version of Jasmin is available (v0.11). It supports ZX Spectrum 128 and ZX Spectrum +2 models. Try it [URL="http://www.dustedpixels.co…
I didn't test it yet. As far as ... by updating attribute values while ULA is processing a frame. Having ...
