Search found 607 matches

by IanS
Fri Dec 29, 2017 5:22 pm
Forum: general
Topic: Today I received.....
Replies: 4701
Views: 317264

Re: Today I received.....

Econet Podule PCB. (Rom bit is untested, need to sort out a GAL first)
IMG_20171229_163937585.jpg
by IanS
Thu Dec 28, 2017 3:30 pm
Forum: hardware
Topic: Is this a test hook?
Replies: 11
Views: 534

Re: Is this a test hook?

It's been mentioed a few times over the years.

viewtopic.php?p=177386#p177386

viewtopic.php?t=14065&p=186051#p186051
by IanS
Thu Dec 28, 2017 2:57 pm
Forum: hardware
Topic: Acorn Ethernet 3 podule EPROM and RISCiX
Replies: 8
Views: 613

Re: Acorn Ethernet 3 podule EPROM and RISCiX

It varies, I have boards with 27c020 and 27c1001, it will depend on the link settings.

LK2 - pin 1
LK3 - pin 31
LK4 - pin 30

pin 3 of each link (2,3,4) goes to +5, the middle pin goes to each pin on the rom as listed above. and pin 1 comes from the page latch U14, pins 12, 9 and 15 respectively.
by IanS
Wed Dec 27, 2017 4:27 pm
Forum: hardware
Topic: ZIF Socket
Replies: 3
Views: 274

Re: ZIF Socket

The cut-out was part of the original Acorn speech upgrade, it was intended to support additional voice roms (though I don't think any were officially released). There have been modern versions - http://www.waitingforfriday.com/?p=30 A few companies produced ZIF sockets that fitted in the same space,...
by IanS
Fri Dec 22, 2017 8:48 pm
Forum: software
Topic: ADFFS 2.63 released
Replies: 21
Views: 1487

Re: ADFFS 2.63 released

lurkio wrote: Still can't run !Alps.
You need to try extracting from the files you linked to earlier again, you seem to have missed something.

This is what I get
alps.PNG
by IanS
Fri Dec 22, 2017 8:32 pm
Forum: software
Topic: ADFFS 2.63 released
Replies: 21
Views: 1487

Re: ADFFS 2.63 released

lurkio wrote: The !Alps app on the ALPS Support disc doesn't seem to have a !Run, for some reason.
Load the !Boot into !Edit, it may have never had a !Run file, the !Boot file may do all it needs. It may just need to be "seen" by the Filer to be "working".
by IanS
Fri Dec 22, 2017 8:14 pm
Forum: software
Topic: ADFFS 2.63 released
Replies: 21
Views: 1487

Re: ADFFS 2.63 released

The program !Alps still fails though: Sorry, I haven't been paying enough attention, what should it do. If you hold shift down and double-click on the !Alps app, it will show the files that make up the app (RISC OS Apps are just directories that start with a !, the OS translates double-clicking on ...
by IanS
Fri Dec 22, 2017 7:19 pm
Forum: software
Topic: ADFFS 2.63 released
Replies: 21
Views: 1487

Re: ADFFS 2.63 released

lurkio wrote:Do I need to install a !System folder somehow?
Yes, you can try the apps1 disc from https://www.4corn.co.uk/aview.php?sPath ... /riscos310
by IanS
Fri Dec 22, 2017 6:49 pm
Forum: software
Topic: ADFFS 2.63 released
Replies: 21
Views: 1487

Re: ADFFS 2.63 released

lurkio wrote:
jgharston wrote:If there is no !System in adfs::HardDisk.$ then it's probably in adfs::HardDisk.$.!Boot and your Boot option is turned off. Drop to the command line and do:
*DIR :4.$
*OPT 4,3
*Configure Boot
*Configure Drive 4
Didn't work:
hostfs is drive 0, try that with ":0" and "*conf. dr. 0"
by IanS
Tue Dec 19, 2017 10:29 pm
Forum: hardware
Topic: BBC Master screen interference PiTube direct
Replies: 57
Views: 2367

Re: BBC Master screen interference PiTube direct

Seem a shame to have to produce completely new boards, can the existing boards not be modified. Is the change just the additional couple of gates listed earlier in the thread by hoglet. How easy is it cut the Phi2 line on the board, is it accessible? If it just requires the addition of a 74ls00 (or ...
by IanS
Tue Dec 05, 2017 1:15 pm
Forum: hardware
Topic: Switchable/dynamic/expanded RISC OS
Replies: 25
Views: 1349

Re: Switchable/dynamic/expanded RISC OS

LA21 is present at the sockets on the A540 and latter (mostly selected via a link), so that's the A540, A5000, A4, A3010, A3020, A4000. It's also picked up by some of the RO3 carrier boards used on A305/A310/A440 e.g. the IFEL carrier I have in my A310. I think Acorn's ALA32 also supports this, but...
by IanS
Sun Dec 03, 2017 2:01 pm
Forum: acorn atom
Topic: Saving Programmes on ATOM - current thinking - AtoMMC?
Replies: 11
Views: 627

Re: Saving Programmes on ATOM - current thinking - AtoMMC?

roland wrote:Yes, the AtoMMC is what you need. sirMorris sells these as complete kit so no soldering is required.
You may need to solder in a header for PL8 (where the AtoMMC connects to the Atom PCB).
by IanS
Thu Nov 30, 2017 9:33 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD
Replies: 125
Views: 7422

Re: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD

Great job organising this.

Put me down for the full weekend, with kit please.
by IanS
Tue Nov 28, 2017 11:25 am
Forum: hardware
Topic: Switchable/dynamic/expanded RISC OS
Replies: 25
Views: 1349

Re: Switchable/dynamic/expanded RISC OS

AM29F160DB-75EI would probably do the job. As for the pin connections, it's all in the datasheet. Essentially the data/address lines go straight through with some minor glue to select the chip and force 16bit. I can work out the pins going int othe motherboard, but the phoebe example has a pin head...
by IanS
Mon Nov 27, 2017 10:50 pm
Forum: hardware
Topic: Switchable/dynamic/expanded RISC OS
Replies: 25
Views: 1349

Re: Switchable/dynamic/expanded RISC OS

Any idea what the device under the label is? Any TSOP-56 16bit flash that's at least 2mbit and faster than the ROM speed? I've ordered a load of TSOP-42 16bit flash chips to repair my Iyonix's (£2.50 each), they would do just as well. 512x16 EEPROM don't appear to exist, so we'd need something like...
by IanS
Mon Nov 27, 2017 8:11 pm
Forum: hardware
Topic: Switchable/dynamic/expanded RISC OS
Replies: 25
Views: 1349

Re: Switchable/dynamic/expanded RISC OS

I wonder if it's worth considering what Acorn did On this pic of the Phoebe motherboard you can see two flash chips on DIP carrier boards with 8 pin headers, presumably to allow insitu programming. https://www.4corn.co.uk/articles/phoebe/i/phoebe-iomd2.jpg Any idea what the device under the label is?
by IanS
Mon Nov 27, 2017 7:08 pm
Forum: hardware
Topic: Switchable/dynamic/expanded RISC OS
Replies: 25
Views: 1349

Re: Switchable/dynamic/expanded RISC OS

Well, £2.88+VAT for the eproms would be £13.50, programming is free(ish, I certainly don't charge if I program eproms for people), postage is a couple of quid, so it'd be less than £20 to do a new set. In truth you could do it for even less with reprogrammable eeproms: https://www.mouser.co.uk/Prod...
by IanS
Thu Nov 23, 2017 11:02 pm
Forum: hardware
Topic: A440/R140 Memory Error
Replies: 2
Views: 438

Re: A440/R140 Memory Error

Thanks to flynnjs for desoldering the defective chip at the Abug meet at the weeknd. I ordered a replacement chip on Sunday evening, which arrived today. The machine now happily runs the Test Roms memory test with no errors. It now runs RO 3.11 again without flashing any POST code.
by IanS
Thu Nov 23, 2017 5:38 pm
Forum: past events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 139
Views: 10961

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

Prime wrote:I was talking to people about alternative board houses at the event Ian S I think, can you remind me what your suggestions where?
I've only ever used OSH Park or DirtyPCB (the protopack are cheap if you fit in their size limits). https://dirtypcbs.com/store/pcbs
by IanS
Mon Nov 20, 2017 9:07 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2656
Views: 218888

Re: Worth Taking a Look At

Hi! I'm the one who bought this strange A540 with the eproms that have Markes by hand. The problem is, the machine had seriously battery leaking problems and is not booting up. This one - https://www.ebay.co.uk/itm/Acorn-Archimedes-A540-/202096335398?_trksid=p2047675.l2557&ssPageName=STRK%3AMEBIDX%...
by IanS
Thu Nov 16, 2017 5:38 pm
Forum: past events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 139
Views: 10961

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

sPhilMainwaring wrote:Ian S: Will you have any of your Atom Econet boards with you at ABUG? I've *finally* remembered to take one of my Atoms with me!
Yes, it's been on my list of things to take to the next ABUG since the last meet.
by IanS
Wed Nov 15, 2017 8:30 pm
Forum: past events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 139
Views: 10961

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

Anyone going at the weekend got a spare dram chip KM41C1000P-12 (1Mx1bit), or equivalent they can bring along for my A440/R140?

viewtopic.php?f=16&t=14064
by IanS
Wed Nov 15, 2017 8:26 pm
Forum: hardware
Topic: A440/R140 Memory Error
Replies: 2
Views: 438

A440/R140 Memory Error

So my R140 started flashing an error code on startup, but generally seemed to work ok after the post code had finished. Decoding the error code gives "Long RAM test failure". So I put a set of Test roms in to run the memory test. Looks to me like D29 is broken:- IMG_20171114_210026995_HDR-001.jpg In...
by IanS
Sat Nov 11, 2017 11:38 pm
Forum: hardware
Topic: Trojan Room Coffee Pot
Replies: 8
Views: 682

Re: Trojan Room Coffee Pot

Watch the Extra bits video - https://www.youtube.com/watch?v=oZ1EddSnwdc

Explains how it got moved from the unreliable VME kit, to an Arc.
by IanS
Mon Nov 06, 2017 11:54 pm
Forum: hardware
Topic: Broken MDFS
Replies: 30
Views: 1623

Re: Broken MDFS

OK, makes sense. The scsi2sd manual does say that man can live on TERMPWR alone, but it's a bit vague about how much exactly it needs. If the other SCSI cable doesn't help then I'll try again tomorrow with a better PSU. I guess I should also configure the MDFS for serial printing (or buy a parallel...
by IanS
Sun Nov 05, 2017 10:02 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2656
Views: 218888

Re: Worth Taking a Look At

danielj wrote:That backplane looks ostensibly identical to an A5000 backplane?

d.
The connector that plugs into the motherboard is on the other side.
by IanS
Mon Oct 23, 2017 11:41 pm
Forum: hardware
Topic: Arduino Filestore
Replies: 39
Views: 2483

Re: Arduino Filestore

I mentioned a while back that I was working on getting an Arduino talking to an Econet card, in the last couple of days I've just about managed to get a reliable 4 way handshake working, which means I've been able to start implementing the file server operations: ... Right now this is very much a w...
by IanS
Wed Oct 18, 2017 6:29 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2656
Views: 218888

Re: Worth Taking a Look At

An Econet tester and software ... http://www.ebay.co.uk/itm/Acorn-Computer-Econet-Tester-/292298191627?hash=item440e54730b:g:igUAAOSwmeRZ52bl Could be one to re-engineer. It's on my list. I don't have the software, but I do have the hardware. Beebmaster also has one http://www.beebmaster.co.uk/Econ...
by IanS
Sun Oct 15, 2017 10:37 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 61
Views: 4071

Re: RISC-PC Not Working

Yes, that's basically it, except it "looks" like a triangle as the two diodes are both connected to the same 5V point on the backplane. There's no diode in the battery holder, it's just a 3xAA battery holder which has 3 rechargeable batteries in. So what I hope I've done is to allow the RISC PC to ...