Search found 588 matches

by IanS
Sat Feb 03, 2018 1:35 pm
Forum: hardware
Topic: Today I overclocked my A3010
Replies: 291
Views: 18968

Re: Today I overclocked my A3010

Looks ok to me, but I'm no expert on thermal relief.

Could you add a label showing what the board is for. "Acorn Axxxx 4M Memory" or something similar.
by IanS
Sat Feb 03, 2018 1:14 pm
Forum: hardware
Topic: Today I overclocked my A3010
Replies: 291
Views: 18968

Re: Today I overclocked my A3010

Looks ok, a couple of comments on the aesthetics. Your initials and date are hidden under the silkscreen. oakram_bit.PNG It would be nice to move some of the component labels so they aren't under other components or cropped at the edge of the board. (e.g. X1, X2 and the C's on the top side) oakram.P...
by IanS
Thu Feb 01, 2018 1:11 pm
Forum: off-topic
Topic: Thermistor, washing machine and hair dryer
Replies: 11
Views: 616

Re: Thermistor, washing machine and hair dryer

Water level is done by a pressure sensor - air filled pipe connects to drum at one end and to a pressure sensor "in the dry". As the water level increases it goes up the pipe compressing the air which actuates an on/off switch (old school, giving a "reached level X"), or more likely these days a pi...
by IanS
Sun Jan 21, 2018 6:45 pm
Forum: archive submissions
Topic: Atom ROMs
Replies: 3
Views: 294

Re: Atom ROMs

Anyone know Paul Bond from the Econet Roms : * : * Copyright (c) Paul Bond : * 1981 Topexpress Ltd : * 1 Portugal Place : * Cambridge CB5 8AF : * England : * Tel CAMB 65128 Do you know if they work? Seems to be Econet 2.40 ("04.2 TENOCE" near the start of the roms)
by IanS
Thu Jan 11, 2018 8:41 pm
Forum: past events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 143
Views: 10270

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

1024MAK wrote:On the Friday, numbers gradually fall during the afternoon. Leaving very diminished numbers after 16:30.

Mark
From the intro text, on Friday, we have the room from 5pm.

Sunday, people start to drift away from about lunch time.
by IanS
Tue Jan 09, 2018 12:55 pm
Forum: hardware
Topic: Econet podule for RISCPC & A7000
Replies: 77
Views: 11683

Re: Econet podule for RISCPC & A7000

So I've been trying to make a full Econet podule - http://stardot.org.uk/forums/viewtopic.php?f=41&t=5594&start=4320#p189894 Very interesting! Looks like it can take a standard Econet module as well as discrete components. Correct, Econet hardware modules are getting expensive, and apart fro the ad...
by IanS
Sun Jan 07, 2018 10:43 pm
Forum: hardware
Topic: Econet podule for RISCPC & A7000
Replies: 77
Views: 11683

Re: Econet podule for RISCPC & A7000

So I dissassembled the econet module, to find that it was looking for "7" for ProdType_Econet. If I run "Podule_ReadInfo" (as the module does), with the bitmask &62, I don't get 7 from from the podule for the product type, I get a zero. I'll try some other podules for comparison, as my Rom has "7" a...
by IanS
Sun Jan 07, 2018 9:16 pm
Forum: hardware
Topic: Econet podule for RISCPC & A7000
Replies: 77
Views: 11683

Re: Econet podule for RISCPC & A7000

So I've been trying to make a full Econet podule - http://stardot.org.uk/forums/viewtopic.php?f=41&t=5594&start=4320#p189894 Each bit works ok, I just need a bit of help getting them to work together. With a single byte = 0x08 in the rom, the Econet module works fine. With an extended podule id, and...
by IanS
Tue Jan 02, 2018 11:10 pm
Forum: past events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 143
Views: 10270

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

Can you move me to the "with kit" list as I will probably bring a laptop, so somewhere to put it would be nice.
by IanS
Mon Jan 01, 2018 5:08 pm
Forum: hardware
Topic: Baildon Electronics IDE Interfaces - Replication
Replies: 123
Views: 11298

Re: Baildon Electronics IDE Interfaces - Replication

It may not be too bad . . . . . . . . . . . IdeAIn V6C 09-09-16 - Schematic.PDF If it's not too late, is it worth swapping IC7 from a 74LS174 to a 74LS273, it's the page latch for the ROM, with a 174, it only latches 6 bits, which means there is a maximum rom size of 128K (6 bits, so 64 pages of 2K...
by IanS
Fri Dec 29, 2017 5:58 pm
Forum: general
Topic: Today I received.....
Replies: 4634
Views: 311906

Re: Today I received.....

If I get the rom working, the podule id will come from the eprom/rom/flash. Currently it's bodge-tastic.
by IanS
Fri Dec 29, 2017 5:22 pm
Forum: general
Topic: Today I received.....
Replies: 4634
Views: 311906

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: 516

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: 593

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: 261

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: 1409

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: 1409

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: 1409

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: 1409

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: 1409

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: 2258

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: 1299

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: 611

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: 6156

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: 1299

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: 1299

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: 1299

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: 1299

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: 423

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.