Search found 70 matches

by awilliams
Wed Jul 21, 2021 4:07 am
Forum: 8-bit acorn hardware
Topic: Econet to AUN bridge on Raspberry Pi - released
Replies: 85
Views: 2797

Re: Econet to AUN bridge on Raspberry Pi - released

KenLowe wrote:
Wed Jul 14, 2021 10:57 am
awilliams wrote:
Wed Jul 14, 2021 6:03 am
I would like to express interest in a couple of unpopulated boards please.
Noted. Is that the level shifter board, the Econet module board, or both?
Just the level shifter please. I have some ADF10 boards.
by awilliams
Wed Jul 14, 2021 6:03 am
Forum: 8-bit acorn hardware
Topic: Econet to AUN bridge on Raspberry Pi - released
Replies: 85
Views: 2797

Re: Econet to AUN bridge on Raspberry Pi - released

I would like to express interest in a a couple of unpopulated boards please.
Also is anybody looking at RISC OS 5 drivers for it?
Alan
by awilliams
Fri Jun 11, 2021 12:43 am
Forum: 8-bit acorn hardware
Topic: New Econet device
Replies: 35
Views: 1451

Re: New Econet device

I have been starting to collect data on this and other dirty secrets of Econet implementation as I come across them; this document is meant to be a manifesto for interoperation of various new stuff: the main part of it isn't written yet, but the annex on BBC implementation contains quite a lot of d...
by awilliams
Thu Jun 10, 2021 1:49 pm
Forum: 8-bit acorn hardware
Topic: New Econet device
Replies: 35
Views: 1451

Re: New Econet device

I have exactly the same ADF10 as Phil shows. The part numbers are quite different between the one with the collision detect and the one without even though they both have ADF10 part numbers. 0243,020 iss2 (no collision detection) 0259,200 A iss 1 (with collision detection) 8709 in the top copper lay...
by awilliams
Thu Jun 10, 2021 1:13 pm
Forum: 8-bit acorn hardware
Topic: New Econet device
Replies: 35
Views: 1451

Re: New Econet device

two stations simultaneously transmitting ... The bug in your maths is that two stations simultaneously transmitting are unlikely to be also synchronised . (Obviously the bit periods are aligned, but it's rather less likely that the bytes align). Maybe and maybe not. If you think about a busy net, t...
by awilliams
Wed Jun 09, 2021 2:01 pm
Forum: 8-bit acorn hardware
Topic: New Econet device
Replies: 35
Views: 1451

Re: New Econet device

I am more than happy to be flamed at this point but I have come to the view regarding collision detection that its not worth the effort of bothering at all for most modern use cases. I have at most, including a bridge, eight currently operational devices with Econet interfaces but its rare that any ...
by awilliams
Wed Jun 09, 2021 9:22 am
Forum: 8-bit acorn hardware
Topic: New Econet device
Replies: 35
Views: 1451

Re: New Econet device

Arg, that's fabulous! I will immediately stop trying to invent that wheel myself as I really hadn't got much further than laying out the breadboard and working out that no way in hell would the PIO have the resources to do address matching or CRC. Screen Shot 2021-06-09 at 5.47.09 pm.png I was tryin...
by awilliams
Wed Jun 09, 2021 5:00 am
Forum: 8-bit acorn hardware
Topic: 65C102
Replies: 3
Views: 327

Re: 65C102

Phil,
I have a tube.
send me your address & a couple will be on their way.
Alan
by awilliams
Thu May 06, 2021 2:30 am
Forum: 8-bit acorn hardware
Topic: PAL, MCU, EPROM, Flash programmer recommendations please?
Replies: 16
Views: 2376

Re: PAL, MCU, EPROM, Flash programmer recommendations please?

I recently purchased the TL866II plus and one of its unsung features is that it will tests a lot of TTL chips. Sadly not 2114 RAM but all the other socketed TTL in my unhappy System4 have been tested with it.
by awilliams
Wed May 05, 2021 2:53 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

ok here is another go at a floppy disk image which should have parent directory pointers. I checked the file in !Zap and it looked reasonable this time. The reason the first attempt was naf is that the RTC battery in my RPC has caused PCB damage and the RTC isn't powered any more, so my RPC is booti...
by awilliams
Mon May 03, 2021 8:53 am
Forum: 8-bit acorn hardware
Topic: Question about WFF Econet Clock V.2
Replies: 10
Views: 470

Re: Question about WFF Econet Clock V.2

I had already got as far as ordering the PCB(s) for the WFF design, which should be here shortly, so I already have some commitment to going down this particular route. That's all good, I would just suggest you choose if want to use the powered terminators or the active line bias, and either tweak ...
by awilliams
Mon May 03, 2021 7:25 am
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

Sorry I didn't intend to cause that much grief. I will investigate that again. I will try a different RISC PC, I am getting suspicious of the FDD in my RPC700. Probably tomorrow.
Alan
by awilliams
Tue Apr 27, 2021 2:31 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

Here is a sparchive of 640K FS floppy with $.passwords and $.Dir1.Dir2.Dir3 on it. (I called it a .zip to get it to attach here) I think the parent dir pointer will be in the three bytes immediately before the first dir entry. The location of which will be three bytes further into the object than it...
by awilliams
Mon Apr 26, 2021 3:08 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

One way might be to take an image of a Filestore floppy disc. I have formatted one and just created a bunch of nested directories. I believe the physical format to be the same as ADFS L, so I should be able to read it in a RISC PC. I suppose I could write a couple of lines of basic to call adfsdisco...
by awilliams
Thu Apr 22, 2021 2:50 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

Have you tried the maintenance mode commands without the FS prefix - *MAXDRIVES,*REPORT etc.? Ah thank you for that idea. Now I tried with the FS prefix, well at least *FSFORMAT 4 name works. Incidentally while leafing through old doco this evening I stumbled on the reason. The command syntax chang...
by awilliams
Thu Apr 22, 2021 2:22 pm
Forum: 8-bit acorn hardware
Topic: Question about WFF Econet Clock V.2
Replies: 10
Views: 470

Re: Question about WFF Econet Clock V.2

that was the built in line bias version. This is the powered terminator version.
IMG_0628.jpeg
And some notes on the subject. Including the powered terminator circuit, which is usually packed into a over-sized silver DIN plug.
IMG_0629.jpeg
by awilliams
Thu Apr 22, 2021 1:59 pm
Forum: 8-bit acorn hardware
Topic: Question about WFF Econet Clock V.2
Replies: 10
Views: 470

Re: Question about WFF Econet Clock V.2

And I am finally getting around to getting the bits to build an Econet Clock of the "Waiting For Friday v.2" design. I have looked at that and really if you are not ofay with AVR dev make life simpler for your self and just use a LM555 or better 7555. you are only after a 200KHz squareish...
by awilliams
Tue Apr 20, 2021 12:58 am
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

My issue 2 board broadly agrees, but is linked for a lower board rate. I can't find Links 9,11,or 12 but I do have 13 which is linked north. I changed max drives with the CMOS editor as the other problem I find is that I can't issue any maintenance mode commands. if I do *FSMODE M, all I get for any...
by awilliams
Mon Apr 19, 2021 3:24 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

I have had a bit of luck, I worked out what was up with the EO1 I have been working on. Self inflicted I am afraid. At some point in the past I modified it so you could use a single SFS ROM in the left hand socket if you bend pin 1 out and wire it to A15 somewhere such as lnk2 north, and then you le...
by awilliams
Fri Apr 16, 2021 3:39 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

Oh, that's rather interesting - thanks! I stand corrected. I think we would be in the same boat with the M128 internal co-pro. It has the 65C102 chip as well, but the xtal is 16MHz so its going twice as fast as the filestore. I suspect as it stands the GODIL stuff isn't going to work on any of thes...
by awilliams
Fri Apr 16, 2021 4:15 am
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

It turns out that GODIL50 is not straight forward for in circuit emulation either as the 65c102 has an on chip crystal oscillator. That would have to be ignored and the cpu clock would need to be generated internally in the fpga. In the past when doing single board computers I used to start with rom...
by awilliams
Tue Apr 13, 2021 9:41 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

Ah nice I don't have access to a decent logic analyser but I did get a godil50 & I have made an adaptor for that but I have not yet actually checked if there is code for the 65c102 for that or not yet. If I can't get results via conventional means I will have to broach that.
Alan
by awilliams
Tue Apr 13, 2021 2:43 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

I powered up my second unit today but its not getting as far as lighting up the LED either. On the some what live unit I pulled all the socketed chips out and cleaned their legs with IPA and fine emery paper but that didn't change anything. I also swapped all the socked chips between the two units a...
by awilliams
Tue Apr 13, 2021 5:17 am
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

2. Its expecting some bespoke hardware to be on the user port, this might mess up a machine with a SDcard reader on the user port. Whatever the hardware is its expected to be able to create a good or bad Econet experience for the Filestore. I guess it's expecting one of these - http://www.beebmaste...
by awilliams
Mon Apr 12, 2021 3:44 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

Yes agreed that is exactly what I did. I got 1.022KHz and 240Khz respectively. Neither seemed far enough off to be causing the issue I see though that is measured with my DSO of comparable vintage. Those chip numbers are for an EO1S and differ with the EO1 being tested. Anyway, yawn, too late today ...
by awilliams
Mon Apr 12, 2021 8:31 am
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

I am using the Feb90 issue of the dealer test disk and there are couple of things I noticed. 1. Its using chip numbers for EO1S rather than EO1. 2. Its expecting some bespoke hardware to be on the user port, this might mess up a machine with a SDcard reader on the user port. Whatever the hardware is...
by awilliams
Sun Apr 11, 2021 2:21 am
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

Mark, here are the ROM images from those chips. I took the today so potential for bit rot does exist. FS123&FS133ROMS.7z I am dealing with the door switch using a dupont wire link. IMG_0619.jpeg Which is working IMG_0621.jpeg IMG_0622.jpeg Though I think this is starting to suggest where the...
by awilliams
Sat Apr 10, 2021 2:56 pm
Forum: 8-bit acorn hardware
Topic: FileStore restoration
Replies: 134
Views: 4524

Re: FileStore restoration

Inspired by this thread and by recent discussions with Mark Usher about my Filestores I decided to dump out the crate and see what could be returned to serviceable too. IMG_0611.jpeg I too have a couple of EO1 units but only one E20. The disk in the picture is a 3085S but its dead. There are also tw...
by awilliams
Fri Sep 25, 2020 5:55 am
Forum: 8-bit acorn software: other
Topic: Level 3 File Server Source Code
Replies: 4
Views: 778

Re: Level 3 File Server Source Code

> I'd be interested to see how the copyright check can be disabled. Unfortunately my pair of EO1 units are both playing dead, and are next on the queue for some attention when I get my System4 running again. I can't remember or test, but the Filestore Service manual refers to FServCMOS, which I thin...
by awilliams
Fri Sep 25, 2020 1:56 am
Forum: 8-bit acorn hardware
Topic: Clock Failure
Replies: 24
Views: 1897

Re: Clock Failure

I think that its accidental that my logic analyser picked up IIC address 55 in the bitsteam from your code. I set your code to just repeatedly read. When I started FS106 with the logic analyser it did not detect the bit stream as IIC. I captured from BREAK as the initial conditions of the 6522 look ...

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