Search found 458 matches

by IanS
Wed May 05, 2010 9:44 pm
Forum: hardware
Topic: Master Compact Econet/MMC
Replies: 26
Views: 1911

Re: Master Compact Econet/MMC

Was I right about the thing? From the Welcome guide:- <the thing> is provided to allow the range of characters generated by the keyboard to be extended, for foreign language use in particular. When pressed simultaneously with the <SHIFT> and <CTRL> keys the next character to be typed on the keyboar...
by IanS
Wed May 05, 2010 8:47 pm
Forum: hardware
Topic: Master Compact Econet/MMC
Replies: 26
Views: 1911

Re: Master Compact Econet/MMC

AndyF wrote:I'll try to get you some details of the wiring, basically its sat a few pins in so does not 'start' (drive end) at pin 1 as it were.

Thank you, that would be great.
by IanS
Wed May 05, 2010 5:49 pm
Forum: hardware
Topic: Master Compact Econet/MMC
Replies: 26
Views: 1911

Re: Master Compact Econet/MMC

GoMMC is not what I was after, I was looking to add one of the simpler bit-banged user IO port versions. I can wire it up, just wonder if the software will work. The Drive connector looks like it has been hit hard at some point, one of the rivets holding the connector to the PCB has been bent. The c...
by IanS
Wed May 05, 2010 4:19 pm
Forum: hardware
Topic: Master Compact Econet/MMC
Replies: 26
Views: 1911

Re: Master Compact Econet/MMC

http://www.beebmaster.co.uk/Econet/Number.html Basically you need the *set or *setstation utility which is on disk. I found that link just after I posted. I was hoping it would be a simple type in to reset the ID. I think I'm stuck in a bit of a catch-22. I dont have a drive (only have compact keyb...
by IanS
Wed May 05, 2010 4:03 pm
Forum: hardware
Topic: Master Compact Econet/MMC
Replies: 26
Views: 1911

Re: Master Compact Econet/MMC

Thanks for that.

NFS rom from my beeb gives a "Econet Station 000 No Clock" banner.

Next Question, how do I reset the station number (used to devices with dip switches).
by IanS
Wed May 05, 2010 12:58 pm
Forum: hardware
Topic: Master Compact Econet/MMC
Replies: 26
Views: 1911

Master Compact Econet/MMC

Quick couple of questions about the Master Compact. Has anyone added a simple MMC interface to the joystick port (seems to use the same pins on the 6522 as the User I/O on the beeb. Details of wiring and rom used would be great. I have an Econet module to add to it, but not sure which Rom it needs, ...
by IanS
Wed May 05, 2010 12:40 pm
Forum: past events & exhibitions
Topic: Vintage Computer Fest, 19-20 Jun 2010, Bletchley
Replies: 153
Views: 12774

Re: Vintage Computer Fest, 19-20 Jun 2010, Bletchley

The lack of specific tickets for the event does seem a bit odd.

I, like guddler, can't see how they will have any control over the number that turn up on the day(s).
by IanS
Wed Apr 28, 2010 6:54 pm
Forum: hardware
Topic: building econet network from scratch.
Replies: 81
Views: 4568

Re: building econet network from scratch.

I'm suprised you bothered with the original chips for the clock, unless you are going for authenticity.

My clock is simple schimtt trigger oscilator (based on a 74ls132) and a RS-422 transciever (e.g. SN75176).
by IanS
Wed Apr 28, 2010 6:48 pm
Forum: wanted
Topic: A7000 Backplane
Replies: 2
Views: 458

Re: A7000 Backplane

The original A7000 backplane only has one slot, but a two-slot Risc PC backplane will plug in and work, you just wont be able to quite fit the lid back on.
by IanS
Sat Apr 24, 2010 4:12 pm
Forum: hardware
Topic: user port test program needs testing
Replies: 5
Views: 593

Re: user port test program needs testing

Shouldn't X be different on lines 20 and 60?
256 is greater than 1 byte, you probably meant 255 and 0?
by IanS
Thu Apr 22, 2010 7:57 pm
Forum: hardware
Topic: beeb RGB to component RGB ?
Replies: 17
Views: 1432

Re: beeb RGB to component RGB ?

http://eab.abime.net/showthread.php?t=49874

Something like that should do the job.
by IanS
Wed Mar 24, 2010 8:08 pm
Forum: for sale / freebies
Topic: AtomMMC 2.0
Replies: 96
Views: 9857

Re: AtomMMC 2.0

sirmorris wrote:Do people imagine this to be a stopper?


No, writing to existing files is probably ok.

I recall you saying the firmware could be updated from the SD card, so could the functionality be added later, or would it also require changes to the Atom Rom code?
by IanS
Wed Mar 24, 2010 8:05 pm
Forum: hardware
Topic: 6502 absolute,indexed write behaviour on NMOS chip
Replies: 4
Views: 590

Re: 6502 absolute,indexed write behaviour on NMOS chip

I've not tried this, but reading about your problem, one solution I would try is to map the reads and writes to separate memory locations, so have the read at &B400,X and the write at &B500,X, and only allow &B5xx addresses to be activated on a write, never a read. It would need a jiggl...
by IanS
Sun Mar 21, 2010 11:29 pm
Forum: off-topic
Topic: Best error message ever
Replies: 24
Views: 1810

Re: Best error message ever

matt wrote:(btw: what did the Teletext Masters and the Issue 2 beeb sell for on ebay? I wasn't 'watching' them)


£66, £82 and £93 for the teletext masters.

£77 for the Issue 2 B
by IanS
Tue Mar 16, 2010 8:03 pm
Forum: past events & exhibitions
Topic: Vintage Computer Fest, 19-20 Jun 2010, Bletchley
Replies: 153
Views: 12774

Re: Vintage Computer Fest, 19-20 Jun 2010, Bletchl

Odd thing though, I could have sworn that the RM380Z I used at school had 8" floppy drives. I wander if it was an option? Maybe I'm getting confused. I definitely remember writing code for a conversion from 8" floppy in approx. 1990. Maybe that's where I remember 8" floppies from. Lo...
by IanS
Sun Mar 14, 2010 6:24 pm
Forum: hardware
Topic: a310 motherboard, worth getting this working ?
Replies: 7
Views: 1005

Re: a310 motherboard, worth getting this working ?

Presumably a 3020 keyboard would do? There's one on ebay now - link Unlikely, (that actually looks like an A3000 keyboard to me). The standard acorn keyboard was a serial protocol (for A3x0,A4x0,A540,A5000), the keyboard in the ebay link is just a keyboard matrix, no electronics. On the A30x0 the k...
by IanS
Mon Mar 01, 2010 10:09 pm
Forum: hardware
Topic: Phloopy
Replies: 5
Views: 943

Re: Phloopy

I know it has a loop of tape, but this loop is continuous, and so my interest was really about how the tape was wound... I dont think I ever saw one for real. I think the cut-away pictures in some of the adverts just showed it loosely packed inside the cartridge, just using a pinch roller to pull t...
by IanS
Sun Feb 21, 2010 10:43 pm
Forum: acorn atom
Topic: Atom help
Replies: 4
Views: 698

Re: Atom help

Looks like you'll need some sensible storage for it now:- viewtopic.php?f=8&t=2888&start=0
by IanS
Sun Feb 21, 2010 10:02 pm
Forum: acorn atom
Topic: Atom help
Replies: 4
Views: 698

Re: Atom help

Just looks like you TV doesn't handle the 60Hz of the Atom output very well, have you tried another telly, or if it's really old, look for a vertical hold control.

Looks to me like it's working fine.
by IanS
Sat Feb 20, 2010 7:26 pm
Forum: for sale / freebies
Topic: AtomMMC 2.0
Replies: 96
Views: 9857

Re: AtomMMC 2.0

How many layers is that board? There doesn't appear to be anything connected to the gnd pin of PL8, or a connection to the GND pin of the 74LS139 or 7475.

Have I missed something obvious in the pic?
by IanS
Fri Feb 19, 2010 11:24 pm
Forum: for sale / freebies
Topic: AtomMMC 2.0
Replies: 96
Views: 9857

Re: AtomMMC 2.0

sirmorris wrote:Price TBA. Pre-orders being taken now.


Put me down for a couple, assuming the price isn't excessive.

Ian.
by IanS
Sun Jan 24, 2010 8:45 pm
Forum: off-topic
Topic: Video-CD Format
Replies: 19
Views: 1546

Re: Video-CD Format

I've heard this mentioned before, isn't the problem the fact that the original disks actually didn't store digital video, rather an analogue signal on the disk ? You are correct. Laserdisc video is stored in an analog format. The pictures and maps for the Domesday disc are just still images from a ...
by IanS
Sun Jan 24, 2010 1:22 am
Forum: off-topic
Topic: S-video output mod for the Atari 2600
Replies: 4
Views: 504

Re: S-video output mod for the Atari 2600

Alright, so, how long do I have to wait for some bright spark to figure how to bolt an s-video socket onto the back of my beeb? :) Why would anyone bother? RGB will give a better picture. In order of increasing quality:- Composite S-Video Component RGB I suspect it would be fairly easy to do if any...
by IanS
Wed Jan 13, 2010 9:00 pm
Forum: off-topic
Topic: Atom / What's this inside?
Replies: 5
Views: 594

Re: Atom / What's this inside?

matt wrote:....and is it normal to have to press the 'break' key on power up to bring up the Atom prompt and clear the screen of garbage?


Yes, or at least it always has been on mine.
by IanS
Wed Jan 13, 2010 8:58 pm
Forum: off-topic
Topic: Atom / What's this inside?
Replies: 5
Views: 594

Re: Atom / What's this inside?

The small board attached to the expansion rom socket by the multi-colour cable looks like a software switchable rom board (only one active at a time). Looks like it also has some Ram on it. The big board attached to the expansion connector is probably a RAM board, any close up pics of the chips, mar...
by IanS
Mon Jan 11, 2010 12:37 am
Forum: off-topic
Topic: Atom scart lead possible?
Replies: 1
Views: 330

Re: Atom scart lead possible?

Sure, it's a standard composite video signal.

http://www.xs4all.nl/~fjkraan/comp/atom/atm/atm.html

Page 13.
by IanS
Mon Dec 28, 2009 8:20 pm
Forum: acorn atom
Topic: Atom Gone Potty
Replies: 3
Views: 618

Re: Atom Gone Potty

It's probably worth checking all the memory works ok. Not very efficient, but does the job, the manual has a memory test prog - http://www.xs4all.nl/~fjkraan/comp/atom/atap/atap01.html#91 Section - 12.3.1 RAM Memory Faults Depending on how memory you have will affect what values to enter. #8000 - #9...
by IanS
Mon Dec 28, 2009 4:15 pm
Forum: acorn atom
Topic: Atom Gone Potty
Replies: 3
Views: 618

Re: Atom Gone Potty

Looks like dodgy ram.

The second screenshot looks like it has the usual "Acorn Atom" sign-on message but with an extra bits set.

Re-seat all the ram chips, try swapping them round, they are all the same type.
by IanS
Tue Dec 22, 2009 1:27 pm
Forum: wanted
Topic: System case and keyboard
Replies: 26
Views: 1646

Re: System case and keyboard

"Atom, Elk, BBC B or Master" the Atom and Elk didn't have built in power supplies. So they wont have "power switch/power lead".

All seems a bit vague.
by IanS
Sun Dec 13, 2009 11:53 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2451
Views: 166906

Re: Worth Taking a Look At

I haven't studied the listings in any detail, but I know that I'd be prepared to pay a bit extra related to condition. Clean un-marked, boxed, without ashtray pushed in, with no mods would be worth a bit as a collectors item. Depends if you viewed that as just a "Issue 7 machine" Model A w...

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