Search found 2937 matches

by duikkie
Wed Jun 12, 2019 10:36 am
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scope ?

are you sure ? look at item more information about VIDC chip in A5000 in datasheet page 2 timing control = ckin pin 19 input horizontal timing gives -hsyc, -hi vertical timing give flbk and -v/cs ckin= pin19 input 24mhz signal amplitude 5 volt ? sink= pin20 input ......gnd=low REFV=Rvdac pin43 input...
by duikkie
Tue Jun 11, 2019 6:22 pm
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scope ?

jealous !!! i have allso now about 5 volt on the video chip and about 24 mhz signal , ( i have to calculate :( ) and a lot of ghost signals but yeah it is old stuff :) the big problem is that i do not have HS and VS so no picture :( i have to study the video chip , what is output and what you really...
by duikkie
Mon Jun 10, 2019 10:51 am
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scope ?

Pin 1-2 of lk6

TimoHartong wrote:
Mon Jun 10, 2019 8:32 am
Hi,

Do you remember on which pin you measured the clk to the VIDC ( LK6 ) ?
by duikkie
Mon Jun 10, 2019 5:06 am
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scope ?

Thanks my board is dead :) over a few day a gone look at the signals from kristal to video chip .

Maybe I see a low or bad signal?
by duikkie
Sat Jun 08, 2019 5:43 am
Forum: hardware
Topic: A Little Help Please !
Replies: 3
Views: 189

Re: A Little Help Please !

maybe you can read the manual ? to save from tape to sd card: *tape load or *load program i think by mmfs *card or commando for mmfs rom *din xxx (xxx=0 to 512) save or *save your program repeat the proces Hey guys its me again, OK So to update you that don't recognize me. I'm new and have just plug...
by duikkie
Sat Jun 01, 2019 6:53 am
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scope ?

Thanks I Will look after my holiday Turned out to be easier than I thought to locate. TRM and PCB diagrams linked from my previous postings below. The A5000 PCB diagrams are from Chris' Acorns, and include the pre-IOEB circuits on page 4 of the diagrams "Acorn_A5000TRM_MainPCBCircuitDiagram4of4.pdf"...
by duikkie
Fri May 31, 2019 1:51 pm
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scoop ?

Take your time it is a project a have allo holiday It is very difficult if there is no schematic of the iss1 and if the chips with label are wrong then you have real problem s There is a schematic for this PCB. There are two versions of the A5000 TRM, the first version contains the circuit diagram f...
by duikkie
Thu May 30, 2019 5:15 pm
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scoop ?

O no not a #acornmetoo 😂

danielj wrote:
Thu May 30, 2019 10:21 am
If no one replies it's usually because no one knows the answer :(

(and 20 people replying with "sorry, I don't know" would be a bit "me too!"
by duikkie
Thu May 30, 2019 5:10 pm
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scoop ?

The iss 1 board is with the chips 😄 see picture The other board is with a big chip Is scope a beter word ? too difficult ? or are there no people with A5000 iss1 ? Would it be possible to make a picture of the whole motherboard I can then have a look at the A5000's I have if I have a Issue 1 board. ...
by duikkie
Thu May 30, 2019 3:51 pm
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scoop ?

Is scoop a dutch thing ?
by duikkie
Thu May 30, 2019 3:19 pm
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scoop ?

I wonder are there no People wit A5000 or are there not People with a scoop ? It is very difficult if there is no schematic of the iss1 and if the chips with label are wrong then you have real problem s I know something About beeb this is my frist A5000 and because it was free from an other dutch ac...
by duikkie
Thu May 30, 2019 8:49 am
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scoop ?

too difficult ? or are there no people with A5000 iss1 ?
by duikkie
Tue May 28, 2019 8:12 pm
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scoop ?

are the chips on the right place ?
by duikkie
Tue May 28, 2019 5:29 pm
Forum: hardware
Topic: A5000 link setting ?
Replies: 8
Views: 266

Re: A5000 link setting ?

i don't know but it is an other board dutchacorn :)

look at the missing clock chip ic58

DutchAcorn wrote:
Tue May 28, 2019 3:15 pm
A bit zoomed in then.
by duikkie
Tue May 28, 2019 5:22 pm
Forum: hardware
Topic: A5000 link setting ?
Replies: 8
Views: 266

Re: A5000 link setting ?

that strange the jumpers looks also different ???
DutchAcorn wrote:
Tue May 28, 2019 3:15 pm
A bit zoomed in then.
by duikkie
Tue May 28, 2019 2:54 pm
Forum: hardware
Topic: A5000 link setting ?
Replies: 8
Views: 266

Re: A5000 link setting ?

je had er toch echt een lichtje bij moeten zetten hoor :) ik kan het niet zien op de foto. bij de andere poster is het wel te zien en zitten ze anders Yes that looks wrong. It’s strange though because I believe this is the same board that I reported on in this thread but the links are set correctly ...
by duikkie
Tue May 28, 2019 11:00 am
Forum: hardware
Topic: A5000 link setting ?
Replies: 8
Views: 266

Re: A5000 link setting ?

i think lk10 is wrong ? look at picture link 10 is 1-2 and 3-4
by duikkie
Thu May 23, 2019 6:43 am
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

Re: people with a A5000 iss1 and scoop ?

every thing is old

scoop delay 0.02 uS :1volts
by duikkie
Thu May 23, 2019 5:12 am
Forum: hardware
Topic: people with a A5000 iss1 and scope ?
Replies: 28
Views: 624

people with a A5000 iss1 and scope ?

just asking :)

is there a schematic for A5000 iss 1 ? , i have the one with IOEB chip

are there any scoop pictures ?

i have a clk signal but amplitude 1 volt ?? on the vidc chip freq looks good 20 ns high, 20ns low but 1 volt ??

[-o< [-o< [-o< [-o< [-o< a little bit of help :)
by duikkie
Wed May 22, 2019 3:24 pm
Forum: hardware
Topic: more infomation about VIDC CHIP in A5000
Replies: 4
Views: 242

Re: more infomation about VIDC CHIP in A5000

no hsync yet :( REFV=3,0 volt ? REFS=2.5 volt ? =pin 12 i don't think the circuit arond pin 12 and pin 43 is not fault i think d14 and c88 give 3,0 volt , drop from d14 ? value ?? support someone have idea ??? is this right ? i need clock on pin 19=ckin i need gnd on pin 20= sink i need 5volt on pin...
by duikkie
Wed May 22, 2019 2:42 pm
Forum: hardware
Topic: more infomation about VIDC CHIP in A5000
Replies: 4
Views: 242

Re: more infomation about VIDC CHIP in A5000

is this right ?
i need clock on pin 19=ckin
i need gnd on pin 20= sink
i need 5volt on pin 43 = REFV
i need gnd on pin 18,10,42
i need 5 volt on pin 38 = vddd

then i must have a Hsync and vsync ?
by duikkie
Wed May 22, 2019 2:24 pm
Forum: hardware
Topic: more infomation about VIDC CHIP in A5000
Replies: 4
Views: 242

Re: more infomation about VIDC CHIP in A5000

talking to myself :)
by duikkie
Wed May 22, 2019 5:30 am
Forum: hardware
Topic: more infomation about VIDC CHIP in A5000
Replies: 4
Views: 242

more infomation about VIDC CHIP in A5000

someone ? i don't have a Hsync and V/csync signaal , so no picture on a dead A5000 what does the chip needs to make Hsync and V/csync signal first 5 volt on pin 11 vdda ? allso 5 volt vddd pin 36 or 38 ???? MUXclk on link6 = Ckv1dc pin 19 ? vflybk on pin 22 ? v1drq and output signal ? all Dlines not...
by duikkie
Tue May 21, 2019 2:48 pm
Forum: hardware
Topic: A5000 link setting ?
Replies: 8
Views: 266

A5000 link setting ?

i am trying to get live to a dead A5000 i have downloaded Main PCB links i have a problem with link 10 default is shunt 1-3 and 2-4 , i think the a5000 has 1-2 and 3-4 NON jedec 512k type ?? there are 4 roms with 834000a 51h till 54h is this non jedec 512k type or default jedec 1,2,4 and 8mb roms an...
by duikkie
Fri May 17, 2019 5:37 am
Forum: hardware
Topic: BBC PSU problems
Replies: 21
Views: 515

Re: BBC PSU problems

i think it is a flyback problem , because there is a spike ???
by duikkie
Fri May 17, 2019 5:31 am
Forum: hardware
Topic: BBC PSU problems
Replies: 21
Views: 515

Re: BBC PSU problems

somewhere , some time ago i have posted some pictures making a bbc psu. allso how to diagnost a problem . disconnecting the flyback and the second part of the psu . so you can measure the ac sec side, make sure you disconnect the caps on the second side because the ac can get to 50 volt and the caps...
by duikkie
Thu May 16, 2019 12:31 pm
Forum: hardware
Topic: a5000 not working where to probe
Replies: 2
Views: 241

Re: a5000 not working where to probe

thanks for the links :) it is the board from paul :) so if i have time i will probe it i have NOT a hsync or v/csync on link lk6 rout,gout,bout all not good ( stable white ?) but if ic9 is not getting right signals then chip 9 not working i think where is IOEB chip ? https://stardot.org.uk/forums/vi...
by duikkie
Tue May 14, 2019 5:20 pm
Forum: hardware
Topic: a5000 not working where to probe
Replies: 2
Views: 241

a5000 not working where to probe

i am new :) at a5000 fixing

where to probe ?

is there a list ?

where is IOEB chip ?
by duikkie
Tue Apr 23, 2019 9:10 am
Forum: software: other
Topic: Watford Electronics Diagnostic Disc question
Replies: 7
Views: 324

Re: Watford Electronics Diagnostic Disc question

why not use a formatting program ?
then you see which track is bad :)

a format program normally seek, write E5 to every track on disc