Search found 180 matches

by aotta
Thu Nov 08, 2018 6:42 pm
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

Briliant analysis!
i confirm West S21 is connected to IC1 pin 1, and Est S21 to pin 5 IC18 (active low inputs? i expected an output...)
i'll made some test... if only i'll find the probe for my usb scope... it's an hour i am looking for them! :oops:
by aotta
Thu Nov 08, 2018 2:49 pm
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

Great work Mark, even better than schematics! I will start this evening from suspect ICs, testing continuity and looking for correct response.. Some works to do!
by aotta
Thu Nov 08, 2018 2:02 pm
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

@Paul: a test without ram was one of first things I tried.. No difference
@kazzle & Mark: thanks for all info! I had a little idea of selection logic, made myself while doing the "diy sw ram for under a fiver" in other BBC... Now I have more starting point for testing.
by aotta
Thu Nov 08, 2018 12:08 pm
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

Thank you Kazzle, you explained very well the rom selection logic, and confirmed most of the ideas I made myself. I have already checked E and W expansion board for continuity, and they are ok from connectors to the two ICs on the Watford card. So, I am afraid of one or more 74xx failure, but they a...
by aotta
Thu Nov 08, 2018 10:32 am
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

Thank you Mark, control signal and control circuit is the direction I intend investigate, since the only case I get basic rom working is when fitted in mb slot and link S21 closed with classic bridge (I.e. not connected to expansion board via dedicated wires). All other combinations port to "languag...
by aotta
Thu Nov 08, 2018 9:16 am
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

Thank you, but i am sure it's not a metter of slots or eprom, they work fine in mb slots and in mb other micros, and i tried a lot of combination, included no rom at all on expansion board, getting always the "language? " prompt... πŸ˜”
by aotta
Thu Nov 08, 2018 6:22 am
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

Just got the same board in a BBC last weekend. The user guide is here: http://chrisacorns.computinghistory.org.uk/docs/Watford/WE_RAMROMBoard.pdf Thank you Paul, but it's the manual I quoted in my first post, and it only relate "language?" Error to S21 link. I had the 2 fixed voltage I reported in ...
by aotta
Wed Nov 07, 2018 10:45 pm
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

found : https://stardot.org.uk/forums/viewtopic.php?f=3&t=8755&p=96318&hilit=watford+rom+ram+disc#p96318 your board should be like this, ignore the extra ram top right : Really a monster your WE! why didn't you fit the battery? you already put the read only switch i se... if i'll get mine working, ...
by aotta
Wed Nov 07, 2018 10:38 pm
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

Thanks for the hints CMcDougall, but it's not the slot the problem.. i made several tests, but even without any roms in the boards i get only the "language?" error...
by aotta
Wed Nov 07, 2018 10:19 pm
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Re: Help for a WE RAM / ROM board not working

That's the WE ram/rom 128k board:
WERAMROM_front.jpg
by aotta
Wed Nov 07, 2018 9:18 pm
Forum: hardware
Topic: Help for a WE RAM / ROM board not working
Replies: 45
Views: 1165

Help for a WE RAM / ROM board not working

I bought in the bay a second BBC Micro, reasonable price, with an interesting big black suitcase with Micro siluette for carrying it (yes, a portable beeb diy!) :lol: I power on it and.... continuos beep! Ok, let's look inside. Open the case and... a varta 3.6 battery rolls away on the table, and a ...
by aotta
Fri Oct 19, 2018 10:55 am
Forum: for sale / freebies
Topic: Aries shadow RAM boards
Replies: 6
Views: 787

Re: Aries shadow RAM boards

Hi Philb, i am interested in one of the B32's, is there one still available?
by aotta
Fri Oct 12, 2018 4:29 pm
Forum: hardware
Topic: New A3000 4MB memory
Replies: 71
Views: 4473

Re: New A3000 4MB memory

Good news! My complimenta to you and ians!
by aotta
Tue Sep 18, 2018 5:18 pm
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 120
Views: 8658

Re: IDE interfaces - hardware details

i used simple "male pin strip" bought for pennies in the bay, cutted and soldered in 2 rows... if you have to cut.. what's about doing same thing with female ones?
by aotta
Wed Sep 12, 2018 7:54 pm
Forum: hardware
Topic: New A3000 4MB memory
Replies: 71
Views: 4473

Re: New A3000 4MB memory

Great works! And your desk is in great order compared to my kitchen! (My Amiga 600 still doesn't boot.. I must move soldering station elsewhere ...) :lol:
by aotta
Fri Sep 07, 2018 5:10 pm
Forum: wanted
Topic: Looking for A5000 motherboard
Replies: 0
Views: 485

Looking for A5000 motherboard

After hours spent in trying to repair the A5000 i bought "not working" in the bay, i must admit it's death.

Anyone has in a A5000's motherboard to sell at a reasonable price? [-o<
by aotta
Thu Sep 06, 2018 2:17 pm
Forum: hardware
Topic: A5000 but no display..."Out of Range"
Replies: 13
Views: 845

Re: A5000 but no display..."Out of Range"

And a useful proof about A5000 is working may be if it "beep" when booting, and if keyboard leds works.
And, of course, opening the A5000 and looking around battery area. As robc said, I am afraid the A5000 is damaged, and it is not a video question... I hope for you I am wrong
by aotta
Thu Sep 06, 2018 1:59 pm
Forum: hardware
Topic: Please help with another blooming "I just got a BEEB from Ebay" thread :-)
Replies: 44
Views: 1676

Re: Please help with another blooming "I just got a BEEB from Ebay" thread :-)

Thanks, sorry I'm confused what do I use the db9 serial cable for, the mouse? I thought I plugged the mouse into the DIN socket at the rear of the keyboard? No, you are right, the standard mouse port is a mini Din-9. I was confused by your writing about the DB9, and i thought you was planning a DB9...
by aotta
Thu Sep 06, 2018 1:39 pm
Forum: hardware
Topic: Please help with another blooming "I just got a BEEB from Ebay" thread :-)
Replies: 44
Views: 1676

Re: Please help with another blooming "I just got a BEEB from Ebay" thread :-)

I usually use db9 serial cable, cheap and with less wires than a scart.
Give a tray to your floppy and ide ports if working, you can check them from command line, without mouse.
If you had damage to keyboard tracks, more probably you lost some connection on that ports, that are nearest to battery
by aotta
Tue Sep 04, 2018 10:27 pm
Forum: hardware
Topic: New A3000 4MB memory
Replies: 71
Views: 4473

Re: New A3000 4MB memory

So, in a couple of months they will arrive! :lol:
by aotta
Sat Sep 01, 2018 9:33 am
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 120
Views: 8658

Re: IDE interfaces - hardware details

I used Tl866, very common burner, and i can share the .jed file used if needed. The 8 bit version was posted above by RobC anyway. ...and yes, as IanS noted, am in Italy if you need support! 😁 Thanks! Would you be willing to sell me an already programmed GAL? That would spare me to buy another prog...
by aotta
Fri Aug 31, 2018 1:30 pm
Forum: hardware
Topic: IDE interfaces - hardware details
Replies: 120
Views: 8658

Re: IDE interfaces - hardware details

I used Tl866, very common burner, and i can share the .jed file used if needed. The 8 bit version was posted above by RobC anyway.

...and yes, as IanS noted, am in Italy if you need support! 😁
by aotta
Thu Aug 30, 2018 9:13 am
Forum: hardware
Topic: Please help with another blooming "I just got a BEEB from Ebay" thread :-)
Replies: 44
Views: 1676

Re: Please help with another blooming "I just got a BEEB from Ebay" thread :-)

I solved this wayfor the A3000:
viewtopic.php?f=16&t=9334&p=170915&hili ... rd#p170915

And used the adaptor in the above thread for the A4000 keyboard and mouse
by aotta
Wed Aug 29, 2018 7:22 pm
Forum: hardware
Topic: Please help with another blooming "I just got a BEEB from Ebay" thread :-)
Replies: 44
Views: 1676

Re: Please help with another blooming "I just got a BEEB from Ebay" thread :-)

i have to study further about the ph of aspirina... anyway, i intended the "C" vitamine added ones, to sum the effort of ascorbic acid to acid acetylsalicyic one.... :lol: :lol: :lol: But out of joking, do you use some cotton stick, or toothbrush to clean the pcb? i used a toothbrush for my a5000, a...
by aotta
Wed Aug 29, 2018 7:09 pm
Forum: for sale / freebies
Topic: New A3000 4MB memory
Replies: 44
Views: 3899

Re: New A3000 4MB memory

cmorley wrote: ↑
Wed Aug 29, 2018 6:11 pm
aotta wrote: ↑
Wed Aug 29, 2018 6:04 pm
Interested.. But which is P&P to Italy?
Β£4.15 for Europe :)
Perfect, add my name to orderlist! :D
by aotta
Wed Aug 29, 2018 6:04 pm
Forum: for sale / freebies
Topic: New A3000 4MB memory
Replies: 44
Views: 3899

Re: New A3000 4MB memory

Interested.. But which is P&P to Italy?
by aotta
Wed Aug 29, 2018 6:00 pm
Forum: hardware
Topic: Please help with another blooming "I just got a BEEB from Ebay" thread :-)
Replies: 44
Views: 1676

Re: Please help with another blooming "I just got a BEEB from Ebay" thread :-)

I always use lemonjuice, because I can't stand vinegar smell... Next time, I will try with effervescent aspirina (if the important thing is using an acid solution.. 😜)
by aotta
Sat Aug 25, 2018 12:48 pm
Forum: hardware
Topic: A5000 CMOS Replacement
Replies: 57
Views: 6484

Re: A5000 CMOS Replacement

i made a "piggyback" board too, but not resolved damaged cmos issue for me... the strange is that i have always 5v at pins 44 and 45 of IOC (IC8), even when pcf8583 is disconnetted: is normal they are always high? The pins 5 and 6 of my spider pcb output a different and lower value, may be is there ...
by aotta
Thu Aug 09, 2018 6:16 am
Forum: hardware
Topic: BeebSCSI 7_7
Replies: 161
Views: 7307

Re: BeebSCSI 7_7

Really nice! Time to save money for a 3d printer...