Search found 800 matches

by flynnjs
Sat Dec 29, 2018 12:04 am
Forum: general
Topic: Why was Repton so loved by BBC users yet so disliked by the Commies?
Replies: 31
Views: 714

Re: Why was Repton so loved by BBC users yet so disliked by the Commies?

richardtoohey wrote:
Fri Dec 28, 2018 11:01 pm
But think this will descend into Windows/Mac, vim/emacs, Spectrum/C64/BBC, Atari ST/Amiga blah-de-blahs very quickly!
It won't or I'll lock the thread. Keep it constructive people.
by flynnjs
Thu Dec 20, 2018 11:30 pm
Forum: hardware
Topic: ARM1 versions / batches
Replies: 7
Views: 498

Re: ARM1 versions / batches

Neither of the chips pictured in that thread are ARM1s I'm afraid. So there's probably just a small sample run in 1985, then a small production run in mid 1986. No, the wafers were clearly not ARMs but in the same box there was a packaged device which I thinks was. At the time I hadn't seen the ES ...
by flynnjs
Fri Nov 16, 2018 7:55 am
Forum: off-topic
Topic: The 1772 Disc interface IC - Availability
Replies: 7
Views: 502

Re: The 1772 Disc interface IC - Availability

Dave, I had the same postage problems with the NOS Teac floppy drives. I ended up getting them posted to a hotel (free P&P whilst in the country) while I was visiting and brought them back as luggage. At UK customs they told me the total was below the import allowance and I didn't pay anything extra...
by flynnjs
Thu Nov 15, 2018 7:46 am
Forum: hardware
Topic: Logic Levels for 5V TTL Systems
Replies: 11
Views: 540

Re: Logic Levels for 5V TTL Systems

Maybe a little off topic but i'm struggling with a XC9572XL driven by a DIL oscillator but after some time the CPLD freezes. The oscillator is powered with 5V, the CPLD with 3V3. If the oscillator block is high drive and only driving a light load then you might find it's ringing and overshooting 5v...
by flynnjs
Wed Nov 14, 2018 5:36 pm
Forum: hardware
Topic: Logic Levels for 5V TTL Systems
Replies: 11
Views: 540

Re: Logic Levels for 5V TTL Systems

The topic has drifted quite a lot to clocks so I'll mention that I've been checking out the clock into a XC9500XL which is 5v tolerant. Last night I used the Arb to generate clock pulses with various rise/fall times but all supposedly monotonic (and so that seemed on the high BW 'scope). With a risi...
by flynnjs
Wed Nov 14, 2018 7:56 am
Forum: hardware
Topic: Logic Levels for 5V TTL Systems
Replies: 11
Views: 540

Re: Logic Levels for 5V TTL Systems

Yes, I often find that useful, although it misses the fact the SOME low voltage systems are 5v tolerant on input.

For example, I'm curently using some 3v LVC buffers and sticking 5v into them which is OK according to the device's datasheet.
by flynnjs
Sat Oct 06, 2018 6:21 pm
Forum: hardware
Topic: New hardware suggestion - Pi econet server
Replies: 49
Views: 1950

Re: New hardware suggestion - Pi econet server

That's really clever; this way you can avoid having to buffer too much on the CPLD side. Do you pause the SPI clock to get the microcontroller to skip the stuffed zero bits? Yes, the CPLD keeps track of where the stuffed bits need to be added/dropped and then the micro isn't clocked during the extr...
by flynnjs
Fri Oct 05, 2018 6:56 pm
Forum: hardware
Topic: New hardware suggestion - Pi econet server
Replies: 49
Views: 1950

Re: New hardware suggestion - Pi econet server

Maybe it might be possible to hack something up with SPI, switching between 8 and 9 (maybe 10?) bit mode depending on the zero stuffing state. The CPLD on my board does convert between SPI and econet by bitstuffing and unstuffing. On RX, it obtains byte sync by usng on the opening flags and the eco...
by flynnjs
Tue Sep 25, 2018 9:03 pm
Forum: hardware
Topic: What are people happy soldering ?
Replies: 43
Views: 1305

Re: What are people happy soldering ?

Where's the 0.4mm and 0,5mm options :mrgreen:
by flynnjs
Wed Sep 19, 2018 6:13 pm
Forum: hardware
Topic: New hardware suggestion - Pi econet server
Replies: 49
Views: 1950

Re: New hardware suggestion - Pi econet server

USB Econet uses 2x SIP491 (1 for clock, 1 for data) and 1x LM339 (collision detect)
by flynnjs
Mon Sep 17, 2018 8:07 pm
Forum: hardware
Topic: New hardware suggestion - Pi econet server
Replies: 49
Views: 1950

Re: New hardware suggestion - Pi econet server

Not alot, we have all the USB stuff working and some socketry stuff going on for the the AUN side. Just needs some state tracking and some header addition and stripping when passing between each side. There are a couple of threads going as libusb receive is a bit weird: if you receive in timeout mod...
by flynnjs
Mon Sep 17, 2018 6:54 pm
Forum: hardware
Topic: New hardware suggestion - Pi econet server
Replies: 49
Views: 1950

Re: New hardware suggestion - Pi econet server

there’s this one from flynnjs - The USB Econet dongle works. But there's been lack of enthusiasm to finish the host software. We have something mostly working on Linux+Windows but none of those involved would attempt anything on riscos. I could make dongles available to anyone willing to commit to ...
by flynnjs
Sat Sep 15, 2018 8:45 am
Forum: past events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 207
Views: 9363

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

When we were putting everything back in to the classroom after the event, we noticed two or three boxes full of 5.25" floppies left on Paul1ie's desk. I brought along a few boxes, some originals and some copies. John had a rummage through and took a few. I didn't bring any of them back so they may ...
by flynnjs
Sat Sep 15, 2018 8:42 am
Forum: past events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 207
Views: 9363

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

Coeus wrote:
Fri Sep 14, 2018 7:00 pm
Nigel, you talking about ROM dumping makes me wonder - were you the person seated to the
right of, i.e. next seat away from the window from, flynnjs?
Nope that was Phill "Prime"
by flynnjs
Fri Sep 07, 2018 11:43 am
Forum: past events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 207
Views: 9363

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

Should be on-site around 1500 ... see you soon
by flynnjs
Fri Sep 07, 2018 11:41 am
Forum: hardware
Topic: USA spec BBC model B
Replies: 36
Views: 1398

Re: USA spec BBC model B

On the B+ Acorn provided 32K byte compatible EPROM/ROM sockets suitable for 2764, 27128 and 27256 EPROMs. I've wheeled my .DE Beeb out for the weekend so I'll check where A14 goes. I know for sure that ROMSEL is different on DE/US to a normal B as I've been around it whilst fixing it, so it may wel...
by flynnjs
Sun Sep 02, 2018 11:03 pm
Forum: hardware
Topic: USA spec BBC model B
Replies: 36
Views: 1398

Re: USA spec BBC model B

AFAIK the US and German mobos are the same, it's only the OS and Language that differ.
The German OS only differs from a standard UK OS in the startup banner, other than
that they are byte identical.
I suspect many "US converted back to UK" beebs are actually just German ones.
by flynnjs
Fri Jun 29, 2018 6:56 am
Forum: hardware
Topic: Interesting video device
Replies: 2
Views: 289

Re: Interesting video device

The data sheets aren't the best in the world. I think you are correct, the control registers are only accessed via SPI and parallel is for RAM accesses only. The video engine runs a microcode which allows selecting different bits for display which could be interesting for page flipping etc.
by flynnjs
Thu Jun 28, 2018 8:42 pm
Forum: hardware
Topic: Interesting video device
Replies: 2
Views: 289

Interesting video device

http://www.vlsi.fi/en/products/vs23s040.html

Can be operating in 8-bit parallel mode and has RGB out with reasonable colour depth at good resolution.
I feel another project coming on :-)
by flynnjs
Sun Jun 10, 2018 8:00 am
Forum: past events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 207
Views: 9363

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

I'll be there all weekend
by flynnjs
Sun Jun 10, 2018 7:53 am
Forum: hardware
Topic: US BBC micro restoration - help (and PSU) needed
Replies: 25
Views: 1420

Re: US BBC micro restoration - help needed

In fact I think the MODE 7 issue I have may be due to incorrect link settings for the VidProc, but I can't find what the links should be anywhere. It may be that this PCB is only laid out for later versions of Vidproc just like the UK beebs that had the "hidden" wire on the underside. Do you have a...
by flynnjs
Sun Jun 03, 2018 9:48 pm
Forum: hardware
Topic: US BBC micro restoration - help (and PSU) needed
Replies: 25
Views: 1420

Re: US BBC micro restoration - help needed

I'm assuming the circuit itself is pretty similar, if not identical, given that it runs normal Beeb software...(at least I'm hoping it will, when it is working!?). I know for a fact the ROMSEL circuitry is different to a regular beeb as I found when repairing my German Beeb (same as a US Beeb). I w...
by flynnjs
Sat May 19, 2018 8:11 am
Forum: general
Topic: Today I received.....
Replies: 4958
Views: 356237

Re: Today I received.....

1024MAK wrote:Today's and yesterday's arrivals...
It was pot-luck who got the red PCB. I had just one of those left.
The green ones are laid out with the connector the other side so
it doesn't need the extension.
There are no more PCBs (red or green) left now.
by flynnjs
Sat May 05, 2018 3:36 pm
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 168
Views: 17369

Re: BeebSCSI mini

There are 9 more, ready to go out this week as I've hand soldered up the loose boards I had.
I really do have no more then.
by flynnjs
Thu Apr 26, 2018 6:22 am
Forum: past events & exhibitions
Topic: Midlands ABUG November 2018
Replies: 32
Views: 2205

Re: Midlands ABUG November 2018

Good news. I'll be there
by flynnjs
Tue Apr 10, 2018 5:04 pm
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 168
Views: 17369

Re: BeebSCSI mini

3rd batch are now fully dispatched.

I have found a few loose boards which I might make up if I find time but at most will be 2 or 3.
by flynnjs
Thu Apr 05, 2018 6:28 am
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 168
Views: 17369

Re: BeebSCSI mini

The hardware was assembled at the weekend but I ran out of time to program and test them.
Should be able to do that in the next few days.
by flynnjs
Thu Apr 05, 2018 6:27 am
Forum: for sale / freebies
Topic: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro
Replies: 603
Views: 65362

Re: Offered: Matchbox sized 6502 / Z80 / 6809 Co Pro

alienkidmj12 wrote:are there likely to be any of these boards made ?
Unlikely as demand has pretty much dried up and it's only sensible to do a
batch of 10 or more.
by flynnjs
Mon Mar 26, 2018 6:51 am
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 168
Views: 17369

Re: BeebSCSI mini

Sorry, had a bout of illness recently and it's put me behind a bit. I'm hoping to have these finished this week.
by flynnjs
Sat Mar 03, 2018 8:30 am
Forum: for sale / freebies
Topic: New TEAC floppy drives
Replies: 55
Views: 5782

Re: New TEAC floppy drives

Waiting for batch 2: VincentVega (x2) lcww1 (x1) alienkidmj12 (x1) Bagpuss (2) cervaro (2) As I'm sure the people who have received these will vouch for, these are brand new, unopened in the antistatic bag and appear to have been stored correctly. However, please remember that they were manufactured...