Search found 2432 matches

by BeebMaster
Wed Oct 18, 2017 7:44 am
Forum: hardware
Topic: Cumana SCSI Podule Multiple Partitions
Replies: 8
Views: 95

Re: Cumana SCSI Podule Multiple Partitions

It is the same disc that was formerly in the MDFS. It could be partition table confusion arising from that, although I haven't conclusively determined yet that 480MB is the maximum start point for a second partition in the Cumana podule. It's somewhere between 320MB and 480MB, I will narrow it down ...
by BeebMaster
Wed Oct 18, 2017 7:39 am
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Usually only teapot, china, tea, kettle etc make it into the holiday suitcase.

It's retained the time dead-on overnight, so I'm going to leave it alone and declare it fixed.

Great news and thanks to everyone for their help!
by BeebMaster
Tue Oct 17, 2017 10:15 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

I switched it on before I did the latest mod when my triangle double diode doings was still in-situ and the time was absolutely bang on even after nearly 24 hours powered off. We'll see what the next 24 hours brings.
by BeebMaster
Tue Oct 17, 2017 10:09 pm
Forum: hardware
Topic: Cumana SCSI Podule Multiple Partitions
Replies: 8
Views: 95

Re: Cumana SCSI Podule Multiple Partitions

I did test it, using the old *CREATE method to fill up the space, and then if the next file you create can be read back you know that part of the disc can be accessed, etc. until the space is used up. With a bit of experimentation and luck I might able to get a first partition of about 450MB (480MB ...
by BeebMaster
Tue Oct 17, 2017 10:06 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

I've done that now, working as expected so far...
by BeebMaster
Tue Oct 17, 2017 8:13 pm
Forum: hardware
Topic: Cumana SCSI Podule Multiple Partitions
Replies: 8
Views: 95

Re: Cumana SCSI Podule Multiple Partitions

I've got a little bit further. I can make it recognise two partitions if the first one is small enough, currently 320MB is the biggest size I've got to. It won't let you mount a partition which starts beyond the first 512MB of the drive and whether anything in the second partition beyond the 512MB i...
by BeebMaster
Tue Oct 17, 2017 7:37 pm
Forum: hardware
Topic: Cumana SCSI Podule Multiple Partitions
Replies: 8
Views: 95

Re: Cumana SCSI Podule Multiple Partitions

Relevant bits of ROMMODULES: 1 Podule 1 SCSILog 1.05 Active 2 Podule 1 SCSIDriver 1.03 Active 3 Podule 1 SCSIFS 1.18 Active 4 Podule 1 SCSIFiler 0.32 Active 5 Podule 1 CDFSdriver 2.10 Dormant 6 Podule 1 CDFS 2.10 Dormant 7 Podule 1 CDFSFiler 2.10 Dormant Relevant bits of STATUS: SCSIFSDirCache 255K ...
by BeebMaster
Tue Oct 17, 2017 6:18 pm
Forum: hardware
Topic: Cumana SCSI Podule Multiple Partitions
Replies: 8
Views: 95

Re: Cumana SCSI Podule Multiple Partitions

It seems I asked the same question in 2014 , and at that time it was concluded that it was generally too ancient to support large drives. However what wasn't really explained at that time was why it will format a large drive and allow it to be partitioned up, but not mount any partition other than t...
by BeebMaster
Mon Oct 16, 2017 9:02 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Right then, I had better be doing that post-haste before the whole thing goes up in flames. Which is the positive end of the diode - stripe or non-stripe? I don't know if it's connected to what I've done so far but the clock gained time overnight (5 mins) and also sometimes gains an instant 5 mins o...
by BeebMaster
Mon Oct 16, 2017 9:00 pm
Forum: hardware
Topic: Cumana SCSI Podule Multiple Partitions
Replies: 8
Views: 95

Cumana SCSI Podule Multiple Partitions

I have a Cumana SCSI podule, I use it as a sort of portable podule for backing up Archimedes hard drives. It has a 2GB Seagate 50-pin SCSI drive connected to it. I can't get more than one partition on the drive recognised. With !SCSIMgr, I have formatted the disc, partitioned it as 4 x 511MB parts a...
by BeebMaster
Mon Oct 16, 2017 5:03 pm
Forum: acorn atom
Topic: Acorn Atom Econet
Replies: 10
Views: 177

Re: Acorn Atom Econet

I do have an original Level 2 File Server Master Disc, probably the one referred to, which I bought on E-Bay in November 2004. I just checked, but it only has one library, $.Library. All the files on the whole disc are date-stamped 29/2/1984, which I reckon is long after Acorn stopped supporting Ato...
by BeebMaster
Mon Oct 16, 2017 5:00 pm
Forum: acorn atom
Topic: Acorn Atom Econet
Replies: 10
Views: 177

Re: Acorn Atom Econet

Yes, any server, even Level 4. Actually the Master 128 (possibly later machines as well) has problems communicating with Level 1 because it transmits all the commands in lower case which aren't detected by the L1 file server which only does an upper case check. That's not a problem on the Atom of co...
by BeebMaster
Mon Oct 16, 2017 4:48 pm
Forum: acorn atom
Topic: Acorn Atom Econet
Replies: 10
Views: 177

Re: Acorn Atom Econet

Thank you. The Econet flyer predates the BBC Micro and the description of the network facilities is fairly primitive so I would say that is talking about a Level 1 type implementation. The references in the Econet System User Guide are more advanced, talking about directories, so that must be Level ...
by BeebMaster
Mon Oct 16, 2017 4:06 pm
Forum: software: other
Topic: Bounds / sanity checking on OSWORD F
Replies: 6
Views: 154

Re: Bounds / sanity checking on OSWORD F

In February 2013 I made an as-yet-unpublished picture set on clock setting with TIME$ and OSWORD 14 & 15. MOS 3.20 will accept all kinds of rubbish being sent to it. It accepts the day whether it's right or not; it isn't case sensitive and nor is the month: CMOSTime13binfo only.jpg It will accep...
by BeebMaster
Mon Oct 16, 2017 3:34 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

No resistor, is that vital? What value should I use? They are 2150mAh (mAH? MaH? MAH? Mah?) batteries. Would it be better to connect: Chip +5V with a wire direct to backplane +5V Battery +5V with a wire to a resistor then a diode then to the backplane +5V? I tried that without the resistor but it di...
by BeebMaster
Mon Oct 16, 2017 3:18 pm
Forum: acorn atom
Topic: Acorn Atom Econet
Replies: 10
Views: 177

Re: Acorn Atom Econet

The hierarchical file structure wasn't introduced till the Level 2 file server. In Level 1 users had a single-letter-DFS directory allocated to them and the file server disc was an unmodified DFS disc, so if there are directories with full names being referred to it must be at least a Level 2 type l...
by BeebMaster
Sun Oct 15, 2017 10:13 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Yes, that's basically it, except it "looks" like a triangle as the two diodes are both connected to the same 5V point on the backplane. There's no diode in the battery holder, it's just a 3xAA battery holder which has 3 rechargeable batteries in. So what I hope I've done is to allow the RI...
by BeebMaster
Sun Oct 15, 2017 8:37 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Well, it probably is, most of my things are, but it works and hasn't gone on fire yet, so I've reassembled it and I now have two fully working RISC PCs repaired in the space of one weekend. I shouldn't have waited 6 months thinking I couldn't do it before doing it. I think I'll have to have a go at ...
by BeebMaster
Sun Oct 15, 2017 7:45 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Right. I have fixed it. I even found some 1N1001 diodes, I must have bought them for fixing MDFSes. With one diode I couldn't get the clock to keep going, it just set itself back to the last time input on every reset. I think that was because the clock chip wasn't being powered directly from the bac...
by BeebMaster
Sun Oct 15, 2017 5:37 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Diodes, schmiodes, I knew I wouldn't have any, apart from that special Domesday BAV21 type that looks like a chip. I've taken apart an old shrink-wrap Master battery pack, that has an IN4005, that'll have to do. Do I need 2 diodes? A300 picture shows two, but the RISC PC technical drawing battery/RT...
by BeebMaster
Sun Oct 15, 2017 2:59 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Very nice, although that wasn't an option for me as the pads on the main board were completely corroded away. Just working out how to relocate the battery with the minimum of fuss. If I put a Master 128 type battery holder with resistor & diode built-in, across the +5V and +0V I connected the cl...
by BeebMaster
Sun Oct 15, 2017 1:53 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

It's a bit rough and ready, and of course is only a proof-of-concept, but here is the first ever RISC PC Flying Clock! RPC600FlyingClock1.jpg RPC600FlyingClock2.jpg Works a treat, although the battery hasn't been added yet, and the on-board battery doesn't help, so it forgets itself after a power of...
by BeebMaster
Sun Oct 15, 2017 12:24 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Yes, got all that here. Looking now.
by BeebMaster
Sun Oct 15, 2017 11:28 am
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Right, GUESSING after looking at the datasheet, before my impatience completely eats up my whole mind, body & soul: Pin 1 - Connect to crystal Pin 2 - Connect to crystal Pin 3 - dunno Pin 4 - Connect to battery negative Pin 5 - Connect to C20 on podule (as above) Pin 6 - Connect to C19 on podule...
by BeebMaster
Sun Oct 15, 2017 11:21 am
Forum: software: other
Topic: BBC Domesday Project - Source code available
Replies: 13
Views: 587

Re: BBC Domesday Project - Source code available

This is a very exciting and important find! I understand now why a direct sector dump of the whole drive was sought. I've downloaded my own copy of the files, so far I've only looked at the EXALL listing and I'm drooling already! So are we learning that the BBC Domesday System, that pinnacle of 8-bi...
by BeebMaster
Sun Oct 15, 2017 11:01 am
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Well, that sounds so simple that even I could get it wrong.

Although I'd need a bit more detail of what pin connects to what other component etc.

I'm tempted to be getting the through-hole version of the clock chip if I'm going to do it.
by BeebMaster
Sun Oct 15, 2017 10:42 am
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Hmmm, interesting. I think that would work. The RPC 600 does exactly what the 700 was doing during its duff clock & crystal escapade, ie. red screen of life on power-on, (floppy drive light probably telling me the problem but it isn't connected up at the minute), then enters supervisor mode with...
by BeebMaster
Sun Oct 15, 2017 8:31 am
Forum: hardware
Topic: RISC-PC Not Working
Replies: 59
Views: 2114

Re: RISC-PC Not Working

Only 7 months later I have replaced the clock crystal and it is now back to being fully functional. Remembered the time and date overnight. Yesterday shortly after the repair the hard drive was behaving a bit curiously, it seemed to spin down after about 2 or 3 seconds and take the same amount of ti...
by BeebMaster
Fri Oct 13, 2017 4:12 pm
Forum: software: other
Topic: Variants of ADFS
Replies: 12
Views: 339

Re: Variants of ADFS

I can't offer any assistance really except to egg on anyone and everyone with the capability to do this. One of the major obstacles many of us are finding is being able to archive real SCSI/ST506 Winchester discs. Being able to do a direct sector copy from proper ADFS to IDE/CF/SD etc. ADFS would be...
by BeebMaster
Fri Oct 13, 2017 3:59 pm
Forum: hardware
Topic: 6502 second processor poll
Replies: 36
Views: 758

Re: 6502 second processor poll

My first one (around 2002) was the board only from an external 6502 cheese wedge, from 8BS at a time when Chris had a few without the casing or PSU. I think that one eventually went in the Tesco Cheese Biscuits Box. Then more than one cheese wedge, a Master Turbo from Nelson IT (currently Station 20...

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