Search found 248 matches

by johnkenyon
Mon Feb 19, 2018 3:38 pm
Forum: 8-bit acorn software: other
Topic: Hacking the school Econet
Replies: 24
Views: 3121

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 hardware, software and languages
Topic: Solutions for a sheered screw
Replies: 11
Views: 1190

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: 8-bit acorn hardware
Topic: Kempston Competition Pro
Replies: 12
Views: 1605

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: 8-bit acorn hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 6226

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: 8-bit acorn hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 6226

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: 8-bit acorn hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 6226

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: 8-bit acorn hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 6226

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: 8-bit acorn hardware
Topic: BBC controlled CD Jukebox, great find but need the space!
Replies: 49
Views: 6226

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: 1384

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: 1384

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: 8-bit acorn hardware
Topic: M512 1MB Expansion...
Replies: 7
Views: 972

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: 8-bit acorn hardware
Topic: M512 1MB Expansion...
Replies: 7
Views: 972

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: 8-bit acorn hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 1239
Views: 98165

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: 8-bit acorn software: other
Topic: Accessing ROMs from the 6502 second processor
Replies: 15
Views: 2126

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: 1706

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: 8-bit acorn hardware
Topic: Floppy switch configs
Replies: 41
Views: 3047

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: 8-bit acorn hardware
Topic: Floppy switch configs
Replies: 41
Views: 3047

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: 8-bit acorn hardware
Topic: Electron cassette counter revolution rate
Replies: 26
Views: 1990

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 hardware, software and languages
Topic: Microwriter MW4
Replies: 6
Views: 1319

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: 8-bit acorn hardware
Topic: Beeb to SCART Aspect ratio switching?
Replies: 9
Views: 1229

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: 8-bit acorn hardware
Topic: Beeb to SCART Aspect ratio switching?
Replies: 9
Views: 1229

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 8:44 pm
Forum: 8-bit acorn hardware
Topic: WE 32K RAM Card Repair
Replies: 70
Views: 6492

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 11:00 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2884
Views: 343888

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...
by johnkenyon
Thu Oct 12, 2017 1:25 pm
Forum: 8-bit acorn software: other
Topic: Variants of ADFS
Replies: 16
Views: 2668

Re: Variants of ADFS

What it really needs, is the low level hardware 'drivers' to be separated from the higher level filing system functionality. But apparently sorting out and writing such code is not much fun... As I see it the problem is as follows: 1) Shoehorning in driver code for SCSI, IDE, MMC/SD into the same 1...
by johnkenyon
Fri Sep 29, 2017 9:11 pm
Forum: 8-bit acorn hardware
Topic: Compudata Hard-drive CS-1057
Replies: 54
Views: 4631

Re: Compudata Hard-drive CS-1057

Boydie wrote:Some of the Internal Acorn Documentation I posted to the archive a while back featured Acorn's own method for hacking into an Econet system when you'd forgotten the passwords.
The post can be found at
http://www.stardot.org.uk/forums/viewto ... 9&p=174807
by johnkenyon
Thu Sep 28, 2017 9:54 pm
Forum: 8-bit acorn hardware
Topic: Compudata Hard-drive CS-1057
Replies: 54
Views: 4631

Re: Compudata Hard-drive CS-1057

danielj wrote:It looks like a disc from a level 3 fileserver!

Someone should have an idea about how to get the stuff off it?

d.
Connect the ACB SCSI interface to a Linux PC with a SCSI card and image the drive?
by johnkenyon
Mon Sep 11, 2017 1:18 pm
Forum: 8-bit acorn hardware
Topic: Troubleshooting my latest BBC B
Replies: 70
Views: 6378

Re: Troubleshooting my latest BBC B

Hi again. Checking with a VMM uncovered no problems with voltage distribution. I found no apparent breaks leading from the pins of IC3 (6522). BUT ..... when I probed IC3 with my scope, I noticed that unlike, say, the 6502 and the other 6522 (IC59), the RESET pin doesn't go LOW when the BREAK key i...
by johnkenyon
Fri Sep 08, 2017 12:29 pm
Forum: general
Topic: Today I received.....
Replies: 5988
Views: 608636

Re: Today I received.....

philb wrote:
Now I need to figure out how to deal with the SCSI ones...
Have you got a PC (preferably running Linux) with a spare ISA or PCI slot?

PM me if you want to borrow a card and suitable leads for imaging (assuming you are in the UK...)

/John
by johnkenyon
Fri Aug 11, 2017 10:51 am
Forum: for sale / freebies
Topic: FS: (slightly OT) Legacy PC hardware
Replies: 0
Views: 831

FS: (slightly OT) Legacy PC hardware

Over the years I have accumulated a silly quantity of "legacy" PC hardware. These are all 16 bit ISA cards: * World's biggest pile of 3C509 (10Base2+AUI/10BaseT+10Base2+AUI)and 3C509B (All with 10BaseT+AUI, some with 10Base2 as well) (20 in total) * Handful of 3C503 (10BaseT+AUI) - (usable in 8 bit ...

Go to advanced search