Search found 819 matches

by flynnjs
Tue Dec 10, 2019 7:52 am
Forum: hardware
Topic: Elite in ROM??
Replies: 12
Views: 572

Re: Elite in ROM??

Shall I do some DFDC (rev2) boards too? :D
by flynnjs
Sun Dec 08, 2019 7:14 pm
Forum: hardware
Topic: Elite in ROM??
Replies: 12
Views: 572

Re: Elite in ROM??

Remklep wrote:
Thu Dec 05, 2019 9:27 am
Of course in order for this to work, I first need the 2M128 Solidisk board and (?) a solidisk ROM, or your modified version of it.
I have reverse engineered the 2M128 and could produce some working units
if anyone would like one.
by flynnjs
Tue Oct 29, 2019 7:16 am
Forum: hardware
Topic: What to try re-engineering next.....
Replies: 44
Views: 4431

Re: What to try re-engineering next.....

Does anyone want me to make some of these 2m128 boards ... as I went to the trouble of reversing it and laying it out?
by flynnjs
Sun Sep 29, 2019 9:04 pm
Forum: hardware
Topic: ARM1 versions / batches
Replies: 12
Views: 1126

Re: ARM1 versions / batches

I've not been back and looked in the box of Wafers and ICs we checked over
(which I commented to Jason F at the time I suspected to be an ARM Eng Samp)
so I guess he took that on board and it's now on display.
Would be nice to reunit one of the Eng Samps with the prototype PCB.
by flynnjs
Sun Sep 29, 2019 8:58 pm
Forum: hardware
Topic: Femto Flash Floppy
Replies: 30
Views: 1479

Re: Femto Flash Floppy

Right, but this thread is about Femto Flash Floppy which is aiming for a no
frills, low profile solution.
by flynnjs
Sun Sep 29, 2019 8:51 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 22 to 24 November 2019 - NOW FULL
Replies: 179
Views: 6981

Re: ABUG SOUTH 22 to 24 November 2019 (Hampshire) BOOKING THREAD

I booked a room (a couple of days ago with the sale code :mrgreen: ) so I'd like a full table to put all my test/repair gear on, please.

thanks,
Jason
by flynnjs
Thu Sep 19, 2019 9:16 pm
Forum: hardware
Topic: A3000 arm 3 processor upgrade
Replies: 4
Views: 375

Re: A3000 arm 3 processor upgrade

Moved to the 32-bit hardware section
by flynnjs
Sat Sep 14, 2019 3:05 pm
Forum: past events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 249
Views: 10670

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019. FULL

Elminster wrote:
Fri Sep 13, 2019 3:19 pm
Completely random semi-off topic question. Do you ever use the Ipswich Maker Space,
I wonder if something like that could be used for a semi formal ABUG?
I'm a keyholder there so could facilitate that. I'll have a chat to see what the charge would be.
by flynnjs
Mon Sep 09, 2019 9:24 pm
Forum: hardware
Topic: Cheap Xilinx LX9 Starter Board
Replies: 38
Views: 4545

Re: Cheap Xilinx LX9 Starter Board

Dave and I had a longish conversation about using proper directional level shifters and we decided for compatibilty that it would be the best thing. However, I wanted to aim my adapter at any 40pin device, not just 6502 so it would not be possible to have one direction pin from the FPGA for the enti...
by flynnjs
Wed Aug 28, 2019 10:16 am
Forum: hardware
Topic: Femto Flash Floppy
Replies: 30
Views: 1479

Re: Femto Flash Floppy

Sounds like there are plenty of software options to operating this thing buttonless. So, as my main design goal was to be able to hide it away under a machine so it looks "original" and to run with original filing system (so you can just walk up to a vanilla machine and plug in and go), I shall leav...
by flynnjs
Mon Aug 26, 2019 7:56 pm
Forum: hardware
Topic: Femto Flash Floppy
Replies: 30
Views: 1479

Re: Femto Flash Floppy

i would think that the menu system in this thread should work, although I still need to tweak it. I think the api has been extended, so a better solution should be possible me now. I didn't know that kind of functionality had been implemented. That's awesome as I'd been mulling over how I'd impleme...
by flynnjs
Fri Aug 23, 2019 8:12 pm
Forum: hardware
Topic: Femto Flash Floppy
Replies: 30
Views: 1479

Re: Femto Flash Floppy

I might put the connections on the edge if there is room.
But being under the machine, you're not going to be able
to get to buttons easily so nothing built into the board.
by flynnjs
Fri Aug 23, 2019 5:24 pm
Forum: hardware
Topic: Femto Flash Floppy
Replies: 30
Views: 1479

Re: Femto Flash Floppy

tricky wrote:
Fri Aug 23, 2019 6:26 am
PS I also didn't check the power on the 25 pin port.
There is no power on the 34-way connector either, so like the
BeebSCSI-mini it needs 5v from somewhere.
by flynnjs
Fri Aug 23, 2019 5:18 pm
Forum: hardware
Topic: Femto Flash Floppy
Replies: 30
Views: 1479

Re: Femto Flash Floppy

Correct. It's a very shrunk down gotek.
by flynnjs
Fri Aug 23, 2019 1:09 pm
Forum: hardware
Topic: Femto Flash Floppy
Replies: 30
Views: 1479

Re: Femto Flash Floppy

Phill, thanks for that info. I had considered that but read somewhere someone
had a problem doing that. But if it worked out OK for you then I'll do just that.
Don't see any level problems the 3V CPU driving 5v LS ?
by flynnjs
Thu Aug 22, 2019 11:48 pm
Forum: hardware
Topic: A potential run of BeebSCSI 7.7 (the newest)
Replies: 91
Views: 4675

Re: A potential run of BeebSCSI 7.7 (the newest)

danielj wrote:
Wed Apr 03, 2019 8:03 pm
20 CPLDs later... I think I can safely say I'm not going to have the stomach to do any more of these after this batch for quite a while...

DSC_0205.JPG
A pick and place machine helps :)
by flynnjs
Thu Aug 22, 2019 11:42 pm
Forum: hardware
Topic: Femto Flash Floppy
Replies: 30
Views: 1479

Femto Flash Floppy

Hi all, been working on an enhanced Flash Floppy compatible board. Just like the Matchbox-Copro and the BeebSCSI-mini, this will fit under a Beeb directly on the connector. :wink: Responding to feedback from Master users, I took the challenge of trying to get it to fit in the smaller space available...
by flynnjs
Sat Aug 17, 2019 7:55 pm
Forum: past events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 249
Views: 10670

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019

Jason,
can I take the last full table on Sunday please? I'll come as a "no kitter" up until Sunday.

thanks,
Jason
by flynnjs
Sat Aug 17, 2019 1:08 pm
Forum: past events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 249
Views: 10670

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019

Ah, blast, been away on holiday and missed getting a table for this :(
I couldn't make the last one due to "family incompatibility"
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: 88
Views: 4152

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: 12
Views: 1126

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: 18
Views: 1372

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: 1332

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: 1332

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: 1332

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: 51
Views: 3033

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: 51
Views: 3033

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: 2006

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: 51
Views: 3033

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: 51
Views: 3033

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...