Search found 22 matches

by steve30
Wed Sep 18, 2019 5:13 am
Forum: projects
Topic: steve30's Home Energy Monitor Project
Replies: 6
Views: 615

Re: steve30's Home Energy Monitor Project

BigEd: It would depend on what your load is. For example, if you are using nothing but incandescent light bulbs and electric heaters, then you will have a unity power factor, and the real power and apparent power will both be the same. But if you are using lots of motors, you will have a poor power ...
by steve30
Wed Sep 11, 2019 4:17 pm
Forum: projects
Topic: steve30's Home Energy Monitor Project
Replies: 6
Views: 615

Re: steve30's Home Energy Monitor Project

I decided against measuring the power factor and voltage. I think the voltage is stable enough for it to not affect the accuracy too much, although I may add it at some point if I feel like it. I'm not bothering with PF at the moment as we don't get billed for it. There certainly won't be an iOS/And...
by steve30
Sat Aug 31, 2019 10:09 pm
Forum: projects
Topic: steve30's Home Energy Monitor Project
Replies: 6
Views: 615

steve30's Home Energy Monitor Project

I had a solar PV system installed a couple of years ago, and ever since I've wanted to build something to monitor how much power is generated, used, exported etc. At the moment, I'm limited to the inverter's front panel display and an old (and not very good) Owl-brand energy monitor. I've been worki...
by steve30
Sat Apr 27, 2019 5:37 pm
Forum: software: other
Topic: Watford Electronics Diagnostic Disc question
Replies: 7
Views: 651

Re: Watford Electronics Diagnostic Disc question

Hmm. The image that CMcDougall posted seems to be the same one that I have already. The one from billcarr2005 does seem different though. That actually did something when running the 'random access test'. It looked like it wrote a bit of data then failed with Sector not found.
by steve30
Thu Apr 25, 2019 6:29 am
Forum: software: other
Topic: Watford Electronics Diagnostic Disc question
Replies: 7
Views: 651

Re: Watford Electronics Diagnostic Disc question

I normally use the format programme from the DFS ROM. I was just curious to try this diagnostics disk to see what it did :).
by steve30
Sun Apr 21, 2019 10:25 am
Forum: software: other
Topic: Watford Electronics Diagnostic Disc question
Replies: 7
Views: 651

Watford Electronics Diagnostic Disc question

I was wondering if anyone could advise me about the Watford Diagnostics disk. I 'burned' the disk image onto a floppy and ran it. I'm intrigued to try out the 'Disc system test'. If I run this, it will format a disk, verify it, write data to each track, read it, write it, read it, then the screen sa...
by steve30
Sun Apr 14, 2019 5:59 am
Forum: hardware
Topic: Dirty floppy disks
Replies: 5
Views: 379

Re: Dirty floppy disks

I just took one of the disks out of its housing. This one is a Tandy brand disk.

I gave one side a wipe with isopropyl alcohol and it cleaned up nicely. It'll be interesting to see how well this cleaned disk will work.

For the record, I took one of the already-clean Dysan disks and it worked fine.
by steve30
Sat Apr 13, 2019 7:24 pm
Forum: hardware
Topic: Dirty floppy disks
Replies: 5
Views: 379

Dirty floppy disks

I just bought some 5.25" disks on ebay (new old stock). All but about 5 of them are a bit dirty. I don't know how they've been stored. They do smell a bit 'fusty'. Here is a photo of one of the dirty Dysan disks: disk_dirt.JPG Will these clean up OK? As they are blank, there is no data to recover fr...
by steve30
Sat Apr 13, 2019 7:09 pm
Forum: general
Topic: Date of last (final) use of BBC Micros in classrooms?
Replies: 35
Views: 2422

Re: Date of last (final) use of BBC Micros in classrooms?

We had a mixture of BBCs and Macs in my primary school in the late 1990s. At comprehensive school in the 2000s, the science department had BBC Masters for demonstrating sensing, measurement, data logging etc. They were on trolleys which the technicians could roll between rooms. They were in use as l...
by steve30
Tue Apr 09, 2019 1:13 pm
Forum: hardware
Topic: Fault finding index
Replies: 106
Views: 49615

Re: Fault finding index

As requested, here is a summary of my floppy disk problems. Machine: BBC Model B Issue 7. Problem: Drive motor spins up, head motor steps when required, but no data can be read, and its not clear whether or not it was writing data. Gives a "Disc fault 18 :0 00/00" on Acorn DFS and "Sector not found ...
by steve30
Thu Apr 04, 2019 5:23 pm
Forum: hardware
Topic: 5.25" Floppy drive problems
Replies: 11
Views: 801

Re: 5.25" Floppy drive problems

Fixed it! Right after I posted that I decided to check some of the ICs in the BBC. I tried changing IC79 and IC80, and they were OK. I removed IC87 (74LS123) and put a wire link in between pins 9 and 12 (mentioned in the 1770 installation manual), and it now works fine absolutely fine :). I was able...
by steve30
Thu Apr 04, 2019 4:42 pm
Forum: hardware
Topic: 5.25" Floppy drive problems
Replies: 11
Views: 801

Re: 5.25" Floppy drive problems

Right, I've done some more testing. I tested it with a known working Amiga double density 3.5" drive and a known working 3.5" disk. It gives the exact same problems as it does with the 5.25" drive, so I think the problem will be elsewhere. I think we are managing to write some data when running the ...
by steve30
Wed Apr 03, 2019 3:32 pm
Forum: hardware
Topic: 5.25" Floppy drive problems
Replies: 11
Views: 801

Re: 5.25" Floppy drive problems

I tried that FormDFS programme. It does successfully step the head through all the tracks but terminates with "write error &18".

I do have the drive service manual on my computer. Maybe I ought to get the oscilloscope out and have a poke around :).
by steve30
Wed Apr 03, 2019 12:41 am
Forum: hardware
Topic: 5.25" Floppy drive problems
Replies: 11
Views: 801

Re: 5.25" Floppy drive problems

Thanks for the replies and for John's offer of help. I managed to dig out my other disks, including the Utilities disk. Didn't make any difference. I managed to bodge up a cable and connected a dubious 3.5" PC drive, but that also didn't do much. I tried the Watford Electronics DFS ROM, and that at ...
by steve30
Tue Apr 02, 2019 7:51 pm
Forum: hardware
Topic: 5.25" Floppy drive problems
Replies: 11
Views: 801

5.25" Floppy drive problems

Hi everyone. Those with a good memory might remember my topic from 2011 regarding floppy drive problems - https://stardot.org.uk/forums/viewtopic.php?t=4435 I've barely touched the drive since then, and I've not used the BBCs much. I decided to get it all going again recently. I'm pretty sure my old...
by steve30
Tue Sep 06, 2011 7:22 am
Forum: hardware
Topic: Floppy drive - not much happening
Replies: 12
Views: 1943

Re: Floppy drive - not much happening

The BBC arrived to me with the 1772 already installed. I transferred the 8271 in from another machine. I'd have left the 1772 installed but if you're using the 8271 for a specific reason, did you replace the little jumper in one of the disc interface sockets with the logic chip required by the 8271...
by steve30
Sat Sep 03, 2011 5:09 pm
Forum: hardware
Topic: Floppy drive - not much happening
Replies: 12
Views: 1943

Re: Floppy drive - not much happening

I did check that. S9 was already cut. The BBC arrived to me with the 1772 already installed. I transferred the 8271 in from another machine.

Fascinating website you have there msknight :). I'll have to figure out a way to transfer the programme onto the BBC.
by steve30
Sat Sep 03, 2011 11:31 am
Forum: hardware
Topic: Floppy drive - not much happening
Replies: 12
Views: 1943

Re: Floppy drive - not much happening

BeebMaster, The cable is definitely plugged in the correct way round now. I've restored it to an 8271, and replaced the Watford DDFS with Watford DFS 1.00, but with that in, the computer just seems to hang after it has printed 'BBC Computer 32K, Watford Electronics DFS 1.00' to the screen. There is ...
by steve30
Sat Sep 03, 2011 10:42 am
Forum: hardware
Topic: Floppy drive - not much happening
Replies: 12
Views: 1943

Re: Floppy drive - not much happening

It does indeed sound like something is the wrong way round. I did try plugging the drives in the other way round and whilst they behaved differently, i.e. no light, they still didn't appear to do anything. msknight, what is WEDiags? Unfortunately, the Issue 7 is now refusing to boot with is keyboard...
by steve30
Sat Sep 03, 2011 7:30 am
Forum: hardware
Topic: Floppy drive - not much happening
Replies: 12
Views: 1943

Floppy drive - not much happening

I'd never used a floppy drive on my BBCs before, so I finally got one to try. I got an AND-01 drive. Pictures are here: http://forum.classicamiga.com/forum/showthread.php/4753-Floppy-pr0n. I set the Issue 7 machine up with an 8271 and associated ICs. When the drive is plugged in, the light and motor...
by steve30
Fri Sep 02, 2011 5:42 pm
Forum: introduce yourself
Topic: Hello :)
Replies: 22
Views: 2964

Re: Hello :)

Yay I got a printer :D but........the problem is, it prints the text but it doesnt move the paper up as it prints so it prints all the text in the same place :( Any ideas? G You will have to enter some sort of command to make the BBC send a line feed after each line. I have to do that for all my pr...
by steve30
Fri Sep 02, 2011 3:01 pm
Forum: introduce yourself
Topic: Hi, steve30 here
Replies: 8
Views: 1628

Hi, steve30 here

Hi. Quick intro... I'm mostly an Amiga user but have been fiddling with BBCs a bit over the last few years, so I thought I'd join a forum :). Currently I have an Issue 3 Model B, which doesn't seem to be working at the moment, and an Issue 7 Model B, which seems to work fine. I've only just started ...