Search found 188 matches

by Kazzie
Sun Sep 23, 2018 7:25 pm
Forum: hardware
Topic: BBC Model B - keyboard problems !
Replies: 3
Views: 34

Re: BBC Model B - keyboard problems !

Individual keys' electrical contacts can get dirty over time, but it sounds like you've got something a bit more substantial going on. (Don't worry, this should still be fixable!) It may be possible to work out what's wrong by looking at which keys do and don't work. Can you compare your keyboard's ...
by Kazzie
Sun Sep 23, 2018 1:10 pm
Forum: other vintage computer hardware, software and games
Topic: CRT repair
Replies: 7
Views: 305

Re: CRT repair

As someone else said, the power switch on philips monitors is flakey (the internal latch starts to fail) and does does like yours is starting to go, you can buy new switches (but require discharge, dismantle and desolder) other people just wedge the switch in with a bit of plastic/lollystick!. Don'...
by Kazzie
Sun Sep 23, 2018 4:28 am
Forum: hardware
Topic: I got a Freebeeb! Help needed…
Replies: 11
Views: 229

Re: I got a Freebeeb! Help needed…

You can find details about (and a manual for) the large ATPL Sidewise board here: https://www.retro-kit.co.uk/page.cfm/content/ATPL-Sidewise-Sideways-ROM-board/ Note that not all the unlabeled chips on it are ROMs. The chips in the top left and far bottom right are the ADC and MOS chips that would n...
by Kazzie
Sat Sep 22, 2018 10:24 am
Forum: introduce yourself
Topic: Yet another hello... with wallabies!
Replies: 15
Views: 285

Re: Yet another hello... with wallabies!

Just a quick update and question: Apparently my beeb should be arriving about Wednesday. =D> I'm just wondering if anybody can point me in the right direction for some resources on what kind of cables, adaptors etc. I'll need to be able to get it to run on a regular TV? I'd like to source something...
by Kazzie
Thu Sep 20, 2018 5:16 pm
Forum: hardware
Topic: New econet setup
Replies: 46
Views: 678

Re: New econet setup

Would I be right in guessing that the set of links with the yellow line around them are the station number setting links in a USA beeb? The station number is 003 so it make sense from a binary perspective. A bank of eight jumpers and a resistior pack in close proximity to the 68B54? I may never hav...
by Kazzie
Sun Sep 16, 2018 7:06 pm
Forum: upcoming and recent events & exhibitions
Topic: Do we need more ABug meets? If so, where should they be?
Replies: 24
Views: 481

Re: Do we need more ABug meets? If so, where should they be?

Looking at where ABug meets have been held in the past (and speaking as one who hasn't attended one yet), I feel the parts of GB that are less well covered are Wales, Scotland and the South West of England. But perhaps there aren't any held there because there aren't enough members in those areas, w...
by Kazzie
Sun Sep 16, 2018 6:53 pm
Forum: introduce yourself
Topic: Yet another hello... with wallabies!
Replies: 15
Views: 285

Re: Yet another hello... with wallabies!

Bworp wrote:
Sun Sep 16, 2018 1:28 pm
Yes, I certainly half expect to need to do a repair on the power supply, although it would be a nice surprise if mine doesn't blow up haha!
In an ideal world the capacitors will have already blown up for the previous owner. :twisted:
by Kazzie
Sun Sep 16, 2018 6:50 pm
Forum: hardware
Topic: Phillips CM8833 Troubles
Replies: 6
Views: 119

Re: Phillips CM8833 Troubles

As with anything else, after a good visual inspection, the next step is to work out (by testing) what power supply rails are okay and which ones are missing or low. No need to worry about testing the EHT though. If the tube heater is not glowing, that normally means it has lost it’s supply. Mark I'...
by Kazzie
Sun Sep 16, 2018 6:34 pm
Forum: hardware
Topic: Phillips CM8833 Troubles
Replies: 6
Views: 119

Re: Phillips CM8833 Troubles

Someone else will be able to advise on that point I expect. I looked at the manual and thankfully the power supply diagram is separate from the rest, the bottom part of Page-16 , if it was me that is where I would start, being aware that mains voltage or higher is exposed , usual safety precautions...
by Kazzie
Sun Sep 16, 2018 4:10 pm
Forum: hardware
Topic: Phillips CM8833 Troubles
Replies: 6
Views: 119

Re: Phillips CM8833 Troubles

Without specific knowledge of this monitor although I've seen them in years past (and they are a decent thing usually with Stereo out in some cases, at least the ones I saw commanded relatively high prices in good nick) , the biggest clue I saw in your post was the fact the power light / neon / led...
by Kazzie
Sun Sep 16, 2018 3:04 pm
Forum: hardware
Topic: AND01 troubles
Replies: 35
Views: 721

Re: AND01 troubles

Though with the occasional backward step: see the thread about the monitor my Beeb shares with my Archimedes :(
by Kazzie
Sun Sep 16, 2018 2:48 pm
Forum: hardware
Topic: Phillips CM8833 Troubles
Replies: 6
Views: 119

Phillips CM8833 Troubles

My monitor just gave up on me. It was connected to my A420/1, displaying a static screen, when the picture spontaneously disappeared, the power LED extinguished, and the normally very-very high-pitched whine plummeted significantly. By the time I got my phones spectrum analyzer on it, it was ringing...
by Kazzie
Sun Sep 16, 2018 1:55 pm
Forum: hardware
Topic: AND01 troubles
Replies: 35
Views: 721

Re: AND01 troubles

A short update on further poking: Swapping circuit boards between Sticker and No-sticker results in two grumpy drives. That's not too surprising, as Sticker has a revision 2 circuit board, whereas the others are revision 1. Putting No-sticker's circuit board in Scrappy results in a floppy drive that...
by Kazzie
Sat Sep 15, 2018 6:29 am
Forum: hardware
Topic: Mitsubishi 4853 floppy drive problems
Replies: 12
Views: 228

Re: Mitsubishi 4853 floppy drive problems

Or to put it another way, if you open up the drive and see nothing but a felt pad on the upper head, there's no way you'll be able to read anything from that side of the disk.
by Kazzie
Wed Sep 12, 2018 9:24 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 63
Views: 1943

Re: Atom 2k18 ?

hoglet wrote:
Wed Sep 12, 2018 9:14 pm
Kazzie wrote:
Wed Sep 12, 2018 9:11 pm
Tangentially, any idea on where to get keycaps with non-PC labels on them, for Atom or System?
An old BBC Model B keyboard?
I'd prefer to fix a Beeb rather than cannibalise it!
One option I've considered is a set of blank keycaps (e.g. from eBay), but then I'd need to label them somehow.
by Kazzie
Wed Sep 12, 2018 9:11 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 63
Views: 1943

Re: Atom 2k18 ?

Is the Atom's keyboard effectively an ASCII keyboard built in to the main board? If it is, and if you go as far as getting some keyboards made, I'd be interested in one to adapt for my System replica. The Atom keyboard is quite different to the Acorn System keyboard. It's effectively just a key mat...
by Kazzie
Wed Sep 12, 2018 7:50 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 63
Views: 1943

Re: Atom 2k18 ?

Is the Atom's keyboard effectively an ASCII keyboard built in to the main board? If it is, and if you go as far as getting some keyboards made, I'd be interested in one to adapt for my System replica.
by Kazzie
Wed Sep 12, 2018 7:37 pm
Forum: hardware
Topic: AND01 troubles
Replies: 35
Views: 721

Re: AND01 troubles

As seen on the "I received..." thread, I have the two floppy drives, and this afternoon I've taken them to task. IMG_20180912_1913595.jpg On the left is my drive, bought as faulty spares and repaired by me some months ago. Centre and right are LB's drives. I'll be referring to these (from left to ri...
by Kazzie
Wed Sep 12, 2018 2:30 pm
Forum: acorn atom
Topic: Building an Acorn System 1
Replies: 24
Views: 948

Re: Building an Acorn System 1

Edit: Do you happen to recall the Phillips part number you used? The posters on the other forum I linked to may be interested. The Phillips part is: 82S131. Here's a link to some alternatives . My programmer will do all the alternatives . . . Dave H :D Thanks for the details. Looking at the program...
by Kazzie
Tue Sep 11, 2018 8:03 pm
Forum: hardware
Topic: BBC B beep of death
Replies: 30
Views: 682

Re: BBC B beep of death

Burned tricky's test ROM, removed all other ROMs barring BASIC PB05 in IC101 (right most socket) Boards shows activity on the Address and data bus, but still no video. Still a continuous tone, but the cassette LED lights when you press break (you can hear the relay click) and goes out a few seconds...
by Kazzie
Tue Sep 11, 2018 8:19 am
Forum: acorn atom
Topic: Acorn System 5.25" Drives
Replies: 5
Views: 517

Re: Acorn System 5.25" Drives

As a follow up, the recently uploaded Acorn Information Folder on 4corn.co.uk lists the models of floppy drives approved by Acorn (as of July 84) as follows: 40 Track, Single Sided, Full Height: Tandon TMS100-1 Shugart SA405 (with euroregion modifications) Olivetti FD501 40 Track, Single Sided, Half...
by Kazzie
Mon Sep 10, 2018 2:30 pm
Forum: hardware
Topic: BBC B beep of death
Replies: 30
Views: 682

Re: BBC B beep of death

Apologies, a memory slip there.
by Kazzie
Mon Sep 10, 2018 12:04 pm
Forum: acorn atom
Topic: Building an Acorn System 1
Replies: 24
Views: 948

Re: Building an Acorn System 1

If you get stuck, I can program these for you. I have a Logical Devices Chipmaster (look-up the list) which programs most things. I’ve programmed lots of that part before using a Phillips part number. Note: The Czech parts do have ‘drop-outs’ !! Nothing to do with the programming algorithm, though....
by Kazzie
Mon Sep 10, 2018 12:00 pm
Forum: hardware
Topic: BBC B beep of death
Replies: 30
Views: 682

Re: BBC B beep of death

I note you've tried S25 north and south, but have you tried fitting an inveter (e.g. 7404) to swap the memory banks? As built, toggling S25 enables and disables the upper 16K, but if you have a memory fault in the lower 16K it could still be stopping your machine from booting. There's a detailed exp...
by Kazzie
Sun Sep 09, 2018 7:00 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 203
Views: 6964

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

It looks like you all had fun. On this occasion, while you were playing with BBC-Bs and EPROMs I was at a BBC PROM (in the park), but I'll surely come along to a future meetup that's a little closer to home base (for a day vist at the least). I'd not seen any mention of the November Midlands meet in...
by Kazzie
Fri Sep 07, 2018 5:05 pm
Forum: general
Topic: Today I received.....
Replies: 4792
Views: 327525

Re: Today I received.....

IMG_20180907_1619123.jpg
Two tempremental AND01 floppy drives sent to me by Lardo Boffin. They'll be prodded and poked over the next week to try to work out what's up with them.
by Kazzie
Thu Sep 06, 2018 8:39 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 203
Views: 6964

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

As it happens the 7amp fuse in one on my extensions poped yesterday. ant imagin why onyl had 9 things running off it. I don't think I've ever seen a 7 amp fuse. My toolbox is full of spare 3, 5 and 13 amp specimens, and I've come across the occasional 10 amp example, but never a 7. At first I was w...
by Kazzie
Tue Sep 04, 2018 8:28 pm
Forum: emulators
Topic: MAME: Atom
Replies: 48
Views: 1486

Re: MAME: Atom

I'm intrigued now. From looking at your screenshots it appears that the console output is switched to the other screen, and the original screen is still displayed but not updated. Am I reading this correctly? By extension, if both VDUs are running, would it be possible to update the first screen's m...
by Kazzie
Tue Sep 04, 2018 1:31 pm
Forum: acorn atom
Topic: Building an Acorn System 1
Replies: 24
Views: 948

Re: Building an Acorn System 1

@Kazzie, Do you want to stick to the original using the proms ? As you could consider throwing in some pals/gals. Kind regards, Bram I've got a pair of MH74s571s already, so if I'll be programming something I may as well have a go at those in the first instance. There are some other people looking ...
by Kazzie
Tue Sep 04, 2018 10:38 am
Forum: acorn atom
Topic: Building an Acorn System 1
Replies: 24
Views: 948

Re: Building an Acorn System 1

Programming the PROMs will also have to wait until I come up with a method of programming them (unless there's anybody here that has a programmer suited to 74s571 PROMs). I'm a little nervous in saying this, since they are OTP and to my knowledge I don't have any spares, but according to the device...