Search found 224 matches

by johnkenyon
Thu Mar 08, 2018 4:58 pm
Forum: hardware
Topic: 5.25" Drive Cleaning Kit
Replies: 27
Views: 1771

Re: 5.25" Drive Cleaning Kit

A google for "chamois cleaning swabs" (without the quotes) gives you a few options.

As for cleaning fluids, a bottle of IPA/iso-propyl alcohol/propan-2-ol from the local chemist was always my solvent of choice for tape heads back in the day.

/john
by johnkenyon
Sat Feb 24, 2018 2:11 am
Forum: archive submissions
Topic: Logotron Logo - Welsh version
Replies: 9
Views: 1834

Logotron Logo - Welsh version

I've found this version of Logotron Logo - original label on the EPROM, looked like a match for http://mdfs.net/System/ROMs/Graphics/ACTLOGO100 However after running the image through the Unix/Linux "strings" command I see things like "CROESO I LOGO_C" and "rhif rhy uche" which Google translate tell...
by johnkenyon
Fri Feb 23, 2018 5:55 pm
Forum: archive submissions
Topic: Prestel and Teletext Adaptor ROMs
Replies: 2
Views: 708

Re: Prestel and Teletext Adaptor ROMs

Here's a zip file with the four images.

/John
by johnkenyon
Fri Feb 23, 2018 4:58 pm
Forum: archive submissions
Topic: Prestel and Teletext Adaptor ROMs
Replies: 2
Views: 708

Prestel and Teletext Adaptor ROMs

Whilst digging through a box of old stuff, I found the following four ROMs which I've "imaged". The first one appears to be an early version for the Prestel Adaptor (the version on mdfs.net is v1.10) PRS-1.00: PRESTEL 1.00 (C)1984SofMac The next three appear to be an early version of what became ATS...
by johnkenyon
Thu Feb 22, 2018 9:29 am
Forum: hardware
Topic: Solidisk Tic-Toc RTC
Replies: 34
Views: 7291

Re: Solidisk Tic-Toc RTC

Have to smile, it assumes 20th century, ie. Feb 1918!! Reading manual, shows the various registers, there's not one for century as best I can tell. Not sure whether it's good or not our friend Jon's HADFS60 doesn't pick up date from Tic-Toc as it does in the Master, albeit not tried Jon's fsys on m...
by johnkenyon
Tue Feb 20, 2018 11:07 am
Forum: hardware
Topic: BeebSCSImini
Replies: 45
Views: 3746

Re: BeebSCSImini

the machine hangs at the Acorn ADFS message The usual reason for this is that ADFS uses an odd type of detection on boot to see if the SCSI card is present. Basically it sends a pattern of data which (if a board is connected) it can read back from one of the data latches on the board. BeebSCSI emul...
by johnkenyon
Mon Feb 19, 2018 3:38 pm
Forum: software: other
Topic: Hacking the school Econet
Replies: 15
Views: 1751

Re: Hacking the school Econet

My technique was to keep my eyes peeled for one of the two teachers leaving the Network Manager menu program on an unattended computer. The sequence then went something like. 1) Hit break on the computer logged in with a privileged account. 2) *PRIV <myid> S 3) Hit break again 4) Move to another com...
by johnkenyon
Sat Feb 10, 2018 7:51 pm
Forum: other vintage computer hardware, software and games
Topic: Solutions for a sheered screw
Replies: 11
Views: 873

Re: Solutions for a sheered screw

danielj wrote:I'm wondering if I can just unfill the old head, unscrew it and do as Mark said. I can't work out what size screw it was - it seems to be 4.4mm diameter... That doesn't seem to correlate to anything?

d.
Possibly a BA thread/screw?
by johnkenyon
Thu Feb 08, 2018 11:08 pm
Forum: hardware
Topic: Kempston Competition Pro
Replies: 12
Views: 1209

Re: Kempston Competition Pro

This arrived today with my Master:- 3443F3D0-A70C-4E9A-A8AF-9A7A0C6B5B31.jpeg How do I test a digital joystick? Do any games support them? Thus far google has not helped me much but to be fair I have had a pretty bad day so could well be me not searching very well! You are testing 6 microswitches w...
by johnkenyon
Thu Feb 08, 2018 3:14 pm
Forum: hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 5285

Re: BBC controlled CD Jukebox, great find but need the space!

You may have to drag another Master into the fray, connecting them via the serial ports Yeah, but the Master in MAME needs alot of work before that can happen, so won't be happening anytime soon. From the flyers there are three variants, and currently have the Discmate and Discmonitor that form the...
by johnkenyon
Wed Feb 07, 2018 11:29 pm
Forum: hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 5285

Re: BBC controlled CD Jukebox, great find but need the space!

Here are the DiscMaster Hideaway and Wallbox ROMs Thanks. We get a different DATA CARTRIDGE NOT FOUND screen: 0000.png But when I insert the cartridge it just hangs, so recognises the cartridge but missing something. Investigation required ... I'm assuming that the screen shot is from the wallbox. ...
by johnkenyon
Wed Feb 07, 2018 3:00 pm
Forum: hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 5285

Re: BBC controlled CD Jukebox, great find but need the space!

Thanks for that, John . . . Interesting. I remember seeing the MK6 but don't remember seeing the earlier version. I'm from Bradford, initially, what was your area? Dave H :D Back in the day, I was based in the HGM factory in Cheadle Village and then Heaton Mersey, Stockport. The picture I linked to...
by johnkenyon
Wed Feb 07, 2018 11:13 am
Forum: hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 5285

Re: BBC controlled CD Jukebox, great find but need the space!

The hideaway was capable of being controlled by a HGM Mk6 wallbox using the Mk6's RS232 interface. I'm not sure if I ever saw a mix of wall boxes with the DiscMaster series. Arbiter, as far as I'm aware, only used product made by AMS Ltd. (Amusement Machine Services) of Heckmondwike. The DiscMaster...
by johnkenyon
Wed Feb 07, 2018 8:32 am
Forum: hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 5285

Re: BBC controlled CD Jukebox, great find but need the space!

No problem with photo . . . Had a thought . . . Are you running the wall-box ROM or hideaway ROM? Both Masters. If the former then there will be limited controls, the hideaway, however, will have a normal keyboard. I'm not sure if the wall box actually has a keyboard - I'll check. It will have the ...
by johnkenyon
Thu Feb 01, 2018 10:05 am
Forum: off-topic
Topic: Thermistor, washing machine and hair dryer
Replies: 11
Views: 1062

Re: Thermistor, washing machine and hair dryer

but the engineer had trapped a pipe, which it sucks on to test if water has reached the other end. Water level is done by a pressure sensor - air filled pipe connects to drum at one end and to a pressure sensor "in the dry". As the water level increases it goes up the pipe compressing the air which...
by johnkenyon
Thu Feb 01, 2018 1:49 am
Forum: off-topic
Topic: Thermistor, washing machine and hair dryer
Replies: 11
Views: 1062

Re: Thermistor, washing machine and hair dryer

It isn't a "door closed" sensor. It's a door locked sensor. When the cycle starts power is applied to the PTC element which acts as a self regulating heating element. That warms up a bimetallic strip which actuates a pin to lock the door. The microswitch then operates to confirm that the door is loc...
by johnkenyon
Mon Jan 29, 2018 8:49 pm
Forum: hardware
Topic: M512 1MB Expansion...
Replies: 7
Views: 801

Re: M512 1MB Expansion...

Thanks for the offer, John. Just thinking further here, what is the advantage of using the SIMMs? ideally you'd just use 256kb ones, otherwise it's complete overkill, and ultimately two SIMMs is going to be bulkier than 4x44256 DRAMs? I have a 1MB upgrade already, so I'm really thinking about somet...
by johnkenyon
Sat Jan 27, 2018 12:24 pm
Forum: hardware
Topic: M512 1MB Expansion...
Replies: 7
Views: 801

Re: M512 1MB Expansion...

Or ditch the dram and whack in one of these? http://uk.farnell.com/cypress-semiconductor/cy62157ev30ll-45zsxit/sram-8mbit-512kx16bit-45ns-tsopii/dp/2768033 d. I don't think that part is 5v tolerant. Personally I'd try a couple of 1Mb 30pin SIMMs - solder some turned pin headers on them to turn the ...
by johnkenyon
Fri Jan 26, 2018 1:04 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 851
Views: 50815

Re: RGB to HDMI using a Pi Zero and a small CPLD

It's necessary to deal with some varation in the Beeb's pixel clock, because the tolerence of the Beeb's 16MHz crystal is ~100ppm, and in practice after 30+ years it may actually be worse than this. As an aside... On the Master AIV they fixed this (to permit genlock with the video disc player) by f...
by johnkenyon
Wed Jan 17, 2018 10:24 am
Forum: software: other
Topic: Accessing ROMs from the 6502 second processor
Replies: 15
Views: 1740

Re: Accessing ROMs from the 6502 second processor

Stick the data in a RFS rom and then *load the data into the co-pro memory space. Works on any co-pro, no manipulation of &F4 or &FE30 required, no need to know which SWR slots your ROM code is located. Want more space - install another ROM. It also makes development easier - store the code/data des...
by johnkenyon
Fri Jan 12, 2018 11:13 am
Forum: off-topic
Topic: Decoupling capacitor for ic
Replies: 11
Views: 1363

Re: Decoupling capacitor for ic

i am still playing with pcb exp board for pi zero w to connect with beeb b i am not a electronic men from my school days , i am a lab rat :) but now my question: i did put 104 (10 with 4 zero's =100nf) on my buffer board for the pi , after the problems with the sd card it works looking at a old boa...
by johnkenyon
Sun Jan 07, 2018 11:42 am
Forum: hardware
Topic: Floppy switch configs
Replies: 41
Views: 2200

Re: Floppy switch configs

KenLowe wrote:What is OSCLI"FX180,"+STR$(PAGE/256) actually doing? and what happens if this is removed?
by johnkenyon
Sat Jan 06, 2018 3:08 pm
Forum: hardware
Topic: Floppy switch configs
Replies: 41
Views: 2200

Re: Floppy switch configs

I wonder if you have basic 1 -it doesn't have the OSCLI command. What does it say if you type REPORT? If it will only format 40 tracks, then it's a 40 track drive. It won't be the media. d. Think you might be onto something; - >REPORT? give "Syntax Error" When I remove line 40 it then gives a "Mist...
by johnkenyon
Sat Jan 06, 2018 11:48 am
Forum: hardware
Topic: Electron cassette counter revolution rate
Replies: 26
Views: 1449

Re: Electron cassette counter revolution rate

well, adoptor is in my other house #-o so found battery's , but only 3 not 4 :roll: hunted longer, found another :) so, 1 minute gets you 12 on counter! NOTE: no tape in, counter does not turn 8) So the counter is attached to the feed spool, and will spin more slowly at the beginning of a tape comp...
by johnkenyon
Fri Dec 15, 2017 9:06 pm
Forum: other vintage computer hardware, software and games
Topic: Microwriter MW4
Replies: 6
Views: 1085

Re: Microwriter MW4

jonb wrote: The main thing is I'm not sure if it really is powered by 12v or not. I can't see a voltage regulator on the board although those two transistor-like units might be doing something with the power. They are marked "10KM 8412" - anyone know?
VN10KM MOSFET manufactured week 12 1984?

/John
by johnkenyon
Thu Nov 09, 2017 8:42 am
Forum: hardware
Topic: Beeb to SCART Aspect ratio switching?
Replies: 9
Views: 920

Re: Beeb to SCART Aspect ratio switching?

Thanks for the info. I was just working out the currents, and being Scart it's typically 75R terminations, which at 12V is asking for a not insignificant 160mA, more if boosting from 5V. Not sure what the efficiency of a simple discrete doubler is off top of my head, but in any case I'm thinking we...
by johnkenyon
Wed Nov 08, 2017 7:41 am
Forum: hardware
Topic: Beeb to SCART Aspect ratio switching?
Replies: 9
Views: 920

Re: Beeb to SCART Aspect ratio switching?

A MT3608 board in a small box between the Beeb RGB plug and the scart plug would give you 12v from 5v for 99p without having to modify TV or computer. (from China via eBay)
/john
by johnkenyon
Thu Oct 19, 2017 7:44 pm
Forum: hardware
Topic: WE 32K RAM Card Repair
Replies: 70
Views: 5075

Re: WE 32K RAM Card Repair

Received new cable and 40 pin dip plugs [img]20171019_210352s.jpg[/img], can now make up a new cable for the ram board, just got to work out how I am going to crimp the cable in the plugs without damaging the pins :wink: Peter. Insert the pins into one or more pieces of veroboard/perfboard so that ...
by johnkenyon
Thu Oct 19, 2017 10:00 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2795
Views: 284087

Re: Worth Taking a Look At

An Econet tester and software ... http://www.ebay.co.uk/itm/Acorn-Computer-Econet-Tester-/292298191627?hash=item440e54730b:g:igUAAOSwmeRZ52bl Could be one to re-engineer. It's on my list. I don't have the software, but I do have the hardware. Beebmaster also has one http://www.beebmaster.co.uk/Econ...