Search found 821 matches

by flynnjs
Mon Nov 21, 2011 10:46 pm
Forum: hardware
Topic: SID weirdness.
Replies: 4
Views: 921

Re: SID weirdness.

One of the filters is screwed? Veering off-topic-ish, but if this is the case and it joins the SID graveyard, does anyone know why so many SIDs are dead? Are we approaching a reliability cliff where a large proportion of '80s silicon is going to pack up? I know Furber made some comment in '09 that ...
by flynnjs
Wed Nov 16, 2011 10:29 pm
Forum: hardware
Topic: Solidisk 2meg RAM/ROM 128k Expansions board.
Replies: 2
Views: 511

Re: Solidisk 2meg RAM/ROM 128k Expansions board.

Don't remember and issues with mine, however, I couldn't be
sure of how often I've used tape as I've had disc since day one.

I do occasionally have problem with it not being seat properly
which often gives general wierdness.
by flynnjs
Sun Nov 13, 2011 9:34 pm
Forum: off-topic
Topic: IRC or similar
Replies: 4
Views: 970

IRC or similar

Is there anywhere that Acorn nuts lurk, discussing
stuff real-time? I know some of the threads on here
are near real-time :)
by flynnjs
Sun Nov 13, 2011 9:03 pm
Forum: software: classic games
Topic: Games author/rightsholder? Want them on Beebdroid?
Replies: 6
Views: 1573

Re: Games author/rightsholder? Want them on Beebdroid?

According to Andrew Hodgson, the rights weren't bought by Pace, so that's one more potential party out of the running. I guess it's unlikely we'll ever find out who holds them now My understanding is that it was Set Top Box division (including RiscOS /NCOS) that Pace acquired from E14 and then was ...
by flynnjs
Mon Oct 17, 2011 12:18 pm
Forum: software: classic games
Topic: Games author/rightsholder? Want them on Beebdroid?
Replies: 6
Views: 1573

Re: Games author/rightsholder? Want them on Beebdroid?

I'd take the same attitude as I do when I find people in office who don't update records properly*... act and see who squeals :lol: It's probably a low risk approach as the financial loss for any rights holder must by tiny. If anyone did come forward you could claim that the community has searched p...
by flynnjs
Wed Oct 05, 2011 6:47 am
Forum: hardware
Topic: SCSI Progress At Last
Replies: 46
Views: 6883

Re: SCSI Progress At Last

Erm, I've got no idea whether the AIV SCSI board is supported with Discs.
Anyone know?

Hint taken, I've got enough interested parties to do a run of boards now
so I'll get them submitted into the board house this week regardless.

Jason
by flynnjs
Tue Sep 27, 2011 8:23 pm
Forum: past events & exhibitions
Topic: Retro Revolution - 1st Oct 2011 - Chelmsford
Replies: 18
Views: 4714

Re: Retro Revolution - 1st Oct 2011 - Chelmsford

Well, I've decided I'm not going as I've just got the beginning of a cold today and by the time I've finished a week at work I'll probably want to flake out at home all w/e.

Hope everyone enjoys...
by flynnjs
Wed Sep 21, 2011 8:33 pm
Forum: past events & exhibitions
Topic: Retro Revolution - 1st Oct 2011 - Chelmsford
Replies: 18
Views: 4714

Re: Retro Revolution - 1st Oct 2011 - Chelmsford

I'll try to get along too, although I've got alot on my plate around that time so it might need a bit of careful thought to plan it into the mix. Less than an hour away for me :D
by flynnjs
Sun Jul 03, 2011 6:15 pm
Forum: hardware
Topic: Domesday PSU
Replies: 52
Views: 5159

Re: Domesday PSU

Ian, might be worth having a workshop to help you sort some of
your stuff out. You bring tea cakes and LV-ROM drives (and service
manual) and we bring the soldering iron to stir the tea with :-)
by flynnjs
Fri Jun 24, 2011 2:14 pm
Forum: hardware
Topic: Sideways Ram 101
Replies: 52
Views: 11337

Re: Sideways Ram 101

pstnotpd wrote:The clearest reference I found is the "Advanced Sideways Ram User Guide" by Bruce Smith. I don't think anyone has scanned it yet but it sometimes pops up on ebay or amazon.
Hmm, I have that. I didn't know it wasn't scanned so I'll try to do so in due course.
by flynnjs
Thu Jun 23, 2011 6:13 am
Forum: for sale / freebies
Topic: Possible run of SCSI boards for Master AIV wannabe
Replies: 12
Views: 1792

Re: Possible run of SCSI boards for Master AIV wannabe

OK, numbers are getting to a point where is seems worthwhile. I'll x-post to the mailing list and see if there any lurkers there and then we'll get stuck in.
by flynnjs
Mon May 30, 2011 6:35 am
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 901
Views: 134168

Re: Wires? Pah.....

If you're considering Bluetooth then these seem to be a bargain. I bought a bunch of them a month or so back. Took their time to arrive mind.

http://www.suntekstore.co.uk/Wireless-B ... --TTL.html

3v3 TTL though, so not ideal for Beeb use I guess.
by flynnjs
Fri May 27, 2011 6:08 pm
Forum: for sale / freebies
Topic: Possible run of SCSI boards for Master AIV wannabe
Replies: 12
Views: 1792

Possible run of SCSI boards for Master AIV wannabe

Just in case you've not been following developments in the "Other" forum, I've completed a design for a modern replacement for the long thin internal SCSI board that can be fitted to a Master. Obviously to be fully AIV compliant you'd need a 2nd processor too (not included). Initial indications look...
by flynnjs
Fri May 27, 2011 5:22 pm
Forum: software & utilities for the pc, mac or unix
Topic: Wires? Pah.....
Replies: 901
Views: 134168

Re: Wires? Pah.....

Phantom ROMs sounds like the ROMSEL decoder IC is on the blink or some of the associated jumpers need checking. Strangely, I had exactly this problem last year and had to replace mine.
by flynnjs
Thu May 26, 2011 8:49 pm
Forum: general
Topic: Domesday Reloaded
Replies: 67
Views: 13830

Re: Domesday Reloaded

OK, all routed and a few bugs fixed on the way too! Schematic: AIV-SCSI-sch.png and layout: AIV-SCSI-brd.png Forgot to measure the mounting holes on the genuine board again but I will re-jig it all in due course. I've done a rough run on costs at qty 15. Components = £181 PCB = £125 Therefore unit c...
by flynnjs
Wed May 25, 2011 4:56 pm
Forum: general
Topic: Domesday Reloaded
Replies: 67
Views: 13830

Re: Domesday Reloaded

re: size, I have an original board here and I'll make sure it is sensible to mount, don't fear!
There are two factors for PCB size:
- Fabrication cost
- Licensing of PCB design tool
by flynnjs
Wed May 25, 2011 8:07 am
Forum: general
Topic: Domesday Reloaded
Replies: 67
Views: 13830

Re: Domesday Reloaded

As for mistakes I'm not sure if it is one but on the original the supply from the PSU is isolated from the rest of the logic and the logic gets the power via the SV1 connector pins 18 & 20. Ah, you're right. Looks like the loop-through on the PSU spades was to keep the noise and load of the oscilla...
by flynnjs
Tue May 24, 2011 10:25 pm
Forum: general
Topic: Domesday Reloaded
Replies: 67
Views: 13830

Re: Domesday Reloaded

OK, so I made a start this evening. I popped a schematic into Eagle : AIV-SCSI-sch.png ... and then started tinkering with board layout ... AIV-SCSI-brd.png Looks like the board will be the same width as the original but about 1/3rd of the length. Obviously I now need to route this thing! If anyone ...
by flynnjs
Tue May 24, 2011 8:17 am
Forum: general
Topic: Econet over USB?
Replies: 3
Views: 1373

Re: Econet over USB?

I was going to recreate the framer in a small FPGA and bung it
on the end of a FTDI chip. However, I'm up to my neck in other
projects right now. I hope to start this early next year.
by flynnjs
Tue May 24, 2011 5:55 am
Forum: general
Topic: Domesday Reloaded
Replies: 67
Views: 13830

Re: Domesday Reloaded

Mark wrote: With a diagram that looks easily fittable into a single XC9536. Hi Mark, I'm always one for condensing down where possible. In this case I'm a little wary of swapping out the SCSI inputs for non Schmitt as SCSI can be a pretty noisey environment. Neither the XC9500 or MAX7000S support Sc...
by flynnjs
Mon May 23, 2011 10:57 pm
Forum: general
Topic: Domesday Reloaded
Replies: 67
Views: 13830

Re: Domesday Reloaded

The resistor array is a strange device with each signal pin being pulled both up and down. It's 16pin, with 2 pins being used for the common rails leaving 14 signal pins. Bournes part : 4116R-3-R1/R2 seems to be the correct beast where R1 and R2 are 220R and 330R or vice versa. Now to find some, els...
by flynnjs
Mon May 23, 2011 9:45 pm
Forum: general
Topic: Domesday Reloaded
Replies: 67
Views: 13830

Re: Domesday Reloaded

Yes, I received the board and a few other goodies today. As there is so much interest, I'll reprioritise and do the SCSI board first. I'll try to get my teeth into it tomorrow night. Do we have any idea of how many of these are in demand? I was thinking of etching around 10 boards. Also, do people j...
by flynnjs
Sun May 22, 2011 7:55 pm
Forum: hardware
Topic: Eprom programming voltages...
Replies: 3
Views: 835

Re: Eprom programming voltages...

Typically, non-CMOS units require 21V and CMOS units 12.5V.

27128 c.f 27C128

However, best bet is to check the datasheet first. If unsure
start with 12.5v first.
by flynnjs
Sun Apr 10, 2011 6:22 pm
Forum: hardware
Topic: Music 500(0) schematic
Replies: 12
Views: 3019

Re: Music 500(0) schematic

I've not had any contact about schematics.

However, I've had a PM from a friendly regular on here who is willing to dig out a real unit. I'll buzz it out and recreate a schemaitc from that and post it up in due course.
by flynnjs
Sat Apr 09, 2011 5:19 am
Forum: emulators
Topic: And todays broken pencil award goes to.....
Replies: 14
Views: 3885

Re: And todays broken pencil award goes to.....

The difference between virtualisation and emulation is whether or not a CPU is being emulated. DOSBox emulates the CPU and is, therefore, an emulator. This means it can be ported to other platforms e.g. Sparc. A virtual machine sends the CPU instructions straight through to the host's CPU and so yo...
by flynnjs
Sat Apr 02, 2011 9:54 am
Forum: hardware
Topic: Music 500(0) schematic
Replies: 12
Views: 3019

Music 500(0) schematic

Does anyone have one? I've read the description of how it works and it doesn't seems that complicated and was wondering about building an FPGA based clone.

J
by flynnjs
Fri Mar 11, 2011 7:52 am
Forum: off-topic
Topic: LOL DESCRIPTION
Replies: 618
Views: 74007

Re: LOL DESCRIPTION

I mailed him about getting some photos of the inside. The answer was "I wouldn't like to open it". Makes me a little suspicious, Acorn stuff is *meant* not to have screws in it :lol:
by flynnjs
Wed Mar 09, 2011 7:49 am
Forum: for sale / freebies
Topic: Possible new run of Atom SD card interface boards
Replies: 7
Views: 1093

Re: Possible new run of Atom SD card interface boards

Potentially, yes. Depends if I get all the parts to build mine or manage to acquire an Atom to repair.

Any idea where I can get a case?
by flynnjs
Wed Mar 09, 2011 7:36 am
Forum: past events & exhibitions
Topic: Wakefield Acorn Show / 16 April 2011 / W. Yorks
Replies: 47
Views: 6356

Re: Wakefield Acorn Show / 16 April 2011 / W. Yorks

Upgade me from a possible to definite, I've just booked the Friday off work and will travel up Friday!

Now just need to work out what to take with me :-)
by flynnjs
Tue Mar 01, 2011 10:03 pm
Forum: hardware
Topic: Nasty 1MHz bus
Replies: 22
Views: 2575

Re: Nasty 1MHz bus

When I measure the programming voltage at 21V and the input resistance of the VPP pin to gnd I get 6K ohm. When I then put the EPROM in the programmer and switch to program the voltage drops, it gets hot and then when I re-measure the resistance after I've taken it out it's about 1k ohm. Sounds lik...