Search found 296 matches

by DaveLecky
Tue Oct 13, 2020 9:21 am
Forum: for sale / freebies
Topic: For Sale - SmallyMouse2 boards
Replies: 13
Views: 686

Re: For Sale - SmallyMouse2 boards

If you order another batch.....count me in please.

Thanks

Dave
by DaveLecky
Sun Oct 11, 2020 3:06 pm
Forum: 8-bit acorn hardware
Topic: Unknown rom
Replies: 27
Views: 1016

Re: Unknown rom

Thanks for the clarification folks...

Dave
by DaveLecky
Sun Oct 11, 2020 12:08 pm
Forum: 8-bit acorn hardware
Topic: Unknown rom
Replies: 27
Views: 1016

Re: Unknown rom

Hi again,

I can’t find 33uF ceramic capacitors on EBay, could they be 33nF.....?

F25980B9-702E-4A13-A04E-02980AF37C7D.jpeg

Dave
by DaveLecky
Sat Oct 10, 2020 12:24 pm
Forum: 8-bit acorn hardware
Topic: Unknown rom
Replies: 27
Views: 1016

Re: Unknown rom

Here it is, in my plus3, I must have updated it.

0B2F30BB-A7B2-49AD-B186-54A8822D98CB.jpeg
5EFDAB36-A3A9-4962-BDC2-72DE789F7AE1.jpeg
Dave
by DaveLecky
Sat Oct 10, 2020 11:46 am
Forum: 8-bit acorn hardware
Topic: Unknown rom
Replies: 27
Views: 1016

Re: Unknown rom

Da Dah........It’s ADFS V.1.00 1983...

444745EE-0F05-4AD0-BC6D-A0536C37EF01.jpeg
Thanks everyone

Dave
by DaveLecky
Sat Oct 10, 2020 11:17 am
Forum: 8-bit acorn hardware
Topic: Unknown rom
Replies: 27
Views: 1016

Re: Unknown rom

Thanks everyone, I’ll give it a go....and let you know.

Dave
by DaveLecky
Sat Oct 10, 2020 11:12 am
Forum: 8-bit acorn hardware
Topic: Unknown rom
Replies: 27
Views: 1016

Re: Unknown rom

A couple more questions...please. 1) What would happen if I put the chip into a rom programmer and tried to read it...if it’s not a rom.... 2) What spec would I order for the decoupling capacitor.....is it 33uF.....voltage.....construction. 9FC6FF11-3C57-4789-A5C2-1010F507AED5.jpeg Thanks again Dave
by DaveLecky
Fri Oct 09, 2020 6:51 pm
Forum: 8-bit acorn hardware
Topic: Unknown rom
Replies: 27
Views: 1016

Unknown rom

Hi Folks, Can anyone tell my what this rom is for, I’ve been tidying up my bits n pieces and can’t ID this one. 7F27BE05-1D8D-46EE-A400-C6727988112C.jpeg And what this is, there are lots all over the board, marked A, this one has broken off . 49E09B03-FACC-4180-A7CC-95F910A0E886.jpeg Thanks Dave
by DaveLecky
Sat Oct 03, 2020 8:03 pm
Forum: 8-bit acorn software: other
Topic: Erasing EPROMS, the cheap way
Replies: 31
Views: 1126

Re: Erasing EPROMS, the cheap way

Really looks bad, I’d get it looked at......

As Prince Philip once said “ Looks like it was wired by a cowboy “..... :D

A lot of ships bitd had these fuse carriers, bloody nightmare when they cracked and broke in your hand.

Dave
by DaveLecky
Tue Sep 29, 2020 9:20 am
Forum: 8-bit acorn hardware
Topic: Help! Master 128 Resurrection (hopefully)
Replies: 20
Views: 1320

Re: Help! Master 128 Resurrection (hopefully)

Similar to my problem, checkout my experience here.......


viewtopic.php?f=3&t=20565#p288715

Good luck

Dave
by DaveLecky
Wed Sep 23, 2020 7:56 am
Forum: 8-bit acorn hardware
Topic: Master 128 CMOS Fault - SOLVED
Replies: 7
Views: 490

Re: Master 128 CMOS Fault

SOLVED....

I decided to socket and change IC8 first and BINGO......IT WORKED.

Thanks everyone for your suggestions and help.

Another Master 128 lives to fight another day.

Dave.
by DaveLecky
Sun Sep 20, 2020 8:27 am
Forum: 8-bit acorn hardware
Topic: Master 128 CMOS Fault - SOLVED
Replies: 7
Views: 490

Re: Master 128 CMOS Fault

Thanks for the info MJS,

I’ll be checking what I need and ordering bases to suit.

I may try reflowing, just in case I’m lucky, then change them one by one.

Dave
by DaveLecky
Sat Sep 19, 2020 6:45 pm
Forum: 8-bit acorn hardware
Topic: Master 128 CMOS Fault - SOLVED
Replies: 7
Views: 490

Re: Master 128 CMOS Fault

Hi folks,

I’ve checked the battery connections, belled out the tracks......all ok.

I’ve also swapped over the mainboard to my working master 128 and the problem is still present.

Is suppose I’ll have to replace the above IC’s one at a time.... :(

Dave
by DaveLecky
Sat Sep 19, 2020 8:16 am
Forum: 8-bit acorn hardware
Topic: Master 128 CMOS Fault - SOLVED
Replies: 7
Views: 490

Re: Master 128 CMOS Fault

Thanks guys.....I’ll have a look at your suggestions this morning.

Dave
by DaveLecky
Fri Sep 18, 2020 9:12 pm
Forum: 8-bit acorn hardware
Topic: Master 128 CMOS Fault - SOLVED
Replies: 7
Views: 490

Master 128 CMOS Fault - SOLVED

Hi Folks, I was given this master 128 and can’t find a solution to the problem, can anyone help please. It appears that the configure settings are scrambled and won’t reset. I have checked the keyboard and MOS 3.2 chip on working 128, a new backup battery has been fitted, the voltages are ok when sw...
by DaveLecky
Tue Sep 15, 2020 3:45 pm
Forum: 32-bit acorn hardware
Topic: An alternative approach to CMOS/RTC/Battery replacements?
Replies: 4
Views: 454

Re: An alternative approach to CMOS/RTC/Battery replacements?

Hi Simonm, I was aware of CJE micros modules, £30, this is why I went the home made way. Here is my effort mounted on the back of the backplane for testing. E226A02A-CCD6-4C9B-ACA9-EB3A3DDC0FC0.jpeg I would still like to have a couple of proper pcb’s made up, I’ll have to try again with the software...
by DaveLecky
Tue Sep 15, 2020 9:22 am
Forum: 32-bit acorn hardware
Topic: An alternative approach to CMOS/RTC/Battery replacements?
Replies: 4
Views: 454

Re: An alternative approach to CMOS/RTC/Battery replacements?

Hi there, I had the exact same thoughts with my Riscpc last month, I bought a couple of boards but the chips I had were too big to go onto the board, so put the idea to one side and built a couple of rough prototypes which worked a treat. I played with a couple of pcb design apps but could not get t...
by DaveLecky
Mon Aug 03, 2020 1:30 pm
Forum: 32-bit acorn hardware
Topic: Re: Risc-pc CMOS/RTC components
Replies: 4
Views: 267

Re: Risc-pc CMOS/RTC components

Thanks Ian,

Dave
by DaveLecky
Mon Aug 03, 2020 1:11 pm
Forum: 32-bit acorn hardware
Topic: Re: Risc-pc CMOS/RTC components
Replies: 4
Views: 267

Re: Risc-pc CMOS/RTC components

Hi Ian,

Yes I found that but it’s the through hole equivalent I’m looking for, for my wee test project.

Dave
by DaveLecky
Mon Aug 03, 2020 12:46 pm
Forum: 32-bit acorn hardware
Topic: Re: Risc-pc CMOS/RTC components
Replies: 4
Views: 267

Re: Risc-pc CMOS/RTC components

Hi folks, I’ve been having problems with the SMD components on the CMOS/RTC circuit, some pads have gone,it’s down to earth somewhere etc., and I am going to build a small test board using through hole components. My problem is, I can’t find enough info on the diode D2 to pick an equivalent.The thre...
by DaveLecky
Fri Jul 31, 2020 1:31 pm
Forum: for sale / freebies
Topic: BBC-FDC floppy controller for Raspberry Pi - New Batch In
Replies: 124
Views: 7220

Re: BBC-FDC floppy controller for Raspberry Pi

PayPal is good for me, thanks.

Dave
by DaveLecky
Thu Jul 30, 2020 4:13 pm
Forum: 32-bit acorn hardware
Topic: Risc-pc CD-ROM drive compatibility
Replies: 5
Views: 533

Re: Risc-pc CD-ROM drive compatibility

Hi again, I received my new/old CD-ROM drive, attached it to a duel ide cable, switched on and configured a CD-ROM drive from the drive settings. I got the icon up ok and the drive makes all the normal noises, but it doesn’t read the disc, says it’s no good, the disc is ok. I’ve tried it as, master,...
by DaveLecky
Thu Jul 30, 2020 8:23 am
Forum: for sale / freebies
Topic: BBC-FDC floppy controller for Raspberry Pi - New Batch In
Replies: 124
Views: 7220

Re: BBC-FDC floppy controller for Raspberry Pi

Hi there, this sound promising,

Could you put me down for one too please.

Dave
by DaveLecky
Tue Jul 28, 2020 7:18 am
Forum: 32-bit acorn hardware
Topic: Risc-pc CD-ROM drive compatibility
Replies: 5
Views: 533

Re: Risc-pc CD-ROM drive compatibility

Thanks guys,

I’ve ordered an old cd rom Drive from eBay, only £10 inc postage.

So even if it doesn’t work it will fill the hole nicely........ :lol:

Dave
by DaveLecky
Mon Jul 27, 2020 8:59 am
Forum: 32-bit acorn hardware
Topic: Risc-pc CD-ROM drive compatibility
Replies: 5
Views: 533

Risc-pc CD-ROM drive compatibility

Hi there, Is there a list of Riscpc compatable cd/dvd rom drives. I’ve just bought a strongarm rpc on eBay and it has no CD-ROM installed, just a big hole.... I’ve had a look on the forum but can’t see anything definitive. EDIT....Do rewritable ones work too. Does the speed matter ie 52x etc. Thanks...
by DaveLecky
Thu Jul 23, 2020 4:41 pm
Forum: for sale / freebies
Topic: Acorn BBC B with many (mostly) unused extras
Replies: 21
Views: 1813

Re: Acorn BBC B with many (mostly) unused extras

Hi there, Put it in a safe place, your interest will come back at some point, and you will have all the equipment to get going . I dumped all my beebs, masters and some upgraded arcs about 10 years ago when I got divorced and moved home, BIG mistake, last year I found my original Electron and a box ...
by DaveLecky
Wed Jul 22, 2020 6:57 pm
Forum: 32-bit acorn hardware
Topic: RiscPC video output failure
Replies: 19
Views: 1078

Re: RiscPC video output failure

Thanks for the info.....

Dave
by DaveLecky
Wed Jul 22, 2020 6:15 pm
Forum: 32-bit acorn hardware
Topic: RiscPC video output failure
Replies: 19
Views: 1078

Re: RiscPC video output failure

Hi folks, A quick update.........Tah Dah...... 809CD0EE-2549-4304-A930-1164665456F9.jpeg After a couple of minor adjustments. That is yellow sleeving on very thin wires, not 2.5 twin and earth.... :lol: DF274427-165D-487A-8908-660EC1EEA5FD.jpeg Continuity was ok for pins 1 and 2 from the back of the...
by DaveLecky
Wed Jul 22, 2020 10:21 am
Forum: 32-bit acorn hardware
Topic: RiscPC video output failure
Replies: 19
Views: 1078

Re: RiscPC video output failure

Thanks Phil,

I’ll start with checking the continuity under the board, if I can go that way I’ll have to look into purchasing the , pin vice, kapton tape and roadrunner wire, these are all new to me.

Thanks for the tips, the link to your repair will be a good reference.

Thanks

Dave

Go to advanced search