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by DutchAcorn
Thu Dec 13, 2018 7:56 pm
Forum: archive submissions
Topic: Computer Concepts MEGA3 ROM
Replies: 1
Views: 66

Computer Concepts MEGA3 ROM

As requested by Pernod here: viewtopic.php?f=8&t=16147&p=222300#p222430

The ROM image is attached. The MEGA3 rom is an 128K ROM, 32 pins. It needs a carrier board to use. Pictures of the carrier board:
carrier1.jpg
carrier2.jpg
by DutchAcorn
Tue Dec 11, 2018 6:22 pm
Forum: hardware
Topic: Model, specification, and upgrades identification
Replies: 7
Views: 240

Re: Model, specification, and upgrades identification

Open her up, post a picture of the motherboard and we should get quite far...
by DutchAcorn
Tue Dec 11, 2018 6:15 pm
Forum: software: other
Topic: Bootstrapping a CP/M installation
Replies: 13
Views: 437

Re: Bootstrapping a CP/M installation

... Once that's done, write a quick 20-liner in BASIC to concatenate the files back into one, use MLOAD to convert it and tada, a working Kermit binary! ... In the assumption that you now have a working z80 Kermit binary; can you share the binary? I’m looking for a communication tool for my Exidy S...
by DutchAcorn
Mon Dec 10, 2018 6:39 pm
Forum: for sale / freebies
Topic: Dutchacorn clearing out
Replies: 20
Views: 799

Re: Dutchacorn clearing out

Ok, only Acornsoft Acom and the Bitstik guide still need to be packed and sent. Hope to do that Thursday or Friday. Postage to Norway is (too) expensive; the 4 Acornsoft games are no longer reserverd.
by DutchAcorn
Mon Dec 10, 2018 5:39 am
Forum: archive submissions
Topic: Acornsoft Acom
Replies: 1
Views: 129

Acornsoft Acom

As requested by Pernod in this post: https://stardot.org.uk/forums/viewtopic.php?f=8&t=16147&p=222507#p222430 The Acom adf and rom files are in the attached zip. I made a quick scan of the user guide using my iPad (huge and no OCR), the results are here on my dropbox (but not indefinitely). The cove...
by DutchAcorn
Fri Dec 07, 2018 10:05 pm
Forum: for sale / freebies
Topic: Dutchacorn clearing out
Replies: 20
Views: 799

Re: Dutchacorn clearing out

Added a few more books.
by DutchAcorn
Fri Dec 07, 2018 10:05 pm
Forum: for sale / freebies
Topic: Dutchacorn clearing out
Replies: 20
Views: 799

Re: Dutchacorn clearing out

Could I also take the sealed Econet books (£8) and the Lisp book (£3) please? I’m not totally interested in the level 1 guide as I have a level 3 setup but if you don’t want to split them am happy to take it. :D Thanks! Lardo Actually, the Econet books are packed / wrapped together, which is why th...
by DutchAcorn
Thu Dec 06, 2018 9:35 pm
Forum: for sale / freebies
Topic: Dutchacorn clearing out
Replies: 20
Views: 799

Re: Dutchacorn clearing out

pau1ie wrote:
Thu Dec 06, 2018 9:16 pm
...

Edit - Are the € a typo for £?

I think this is €30 + £4, or more likely £34
Oops, yes, it's all in £. Sorry about that!
by DutchAcorn
Thu Dec 06, 2018 8:55 pm
Forum: for sale / freebies
Topic: Dutchacorn clearing out
Replies: 20
Views: 799

Re: Dutchacorn clearing out

Added more items!
by DutchAcorn
Thu Dec 06, 2018 11:17 am
Forum: for sale / freebies
Topic: BeebMaster BBC B Econet Kit
Replies: 27
Views: 1643

Re: BeebMaster BBC B Econet Kit

Looks great!

For my setup I am just looking for 3x Y lead and 2 terminators. Do you do custom orders? :D
by DutchAcorn
Wed Dec 05, 2018 10:34 pm
Forum: for sale / freebies
Topic: Dutchacorn clearing out
Replies: 20
Views: 799

Re: Dutchacorn clearing out

myelin wrote:
Wed Dec 05, 2018 9:01 pm
I'm interested in a Risc PC!
Sorry myelin, markdryan was first to claim!
by DutchAcorn
Tue Dec 04, 2018 9:07 pm
Forum: for sale / freebies
Topic: Dutchacorn clearing out
Replies: 20
Views: 799

Dutchacorn clearing out

It's time that I part with some of my treasures, the space-time continuum is seemingly finite after all. I will post everything here the coming days; expect books, software and hardware for various Acorn incarnations. Prices are without P&P. Half of the proceeds go to the domesday86 project. Please ...
by DutchAcorn
Sun Dec 02, 2018 6:47 pm
Forum: hardware
Topic: Sharing a Disk Drive
Replies: 21
Views: 1529

Re: Sharing a Disk Drive

1024MAK wrote:
Sun Dec 02, 2018 6:41 pm
It’s possible that the top PCB is the same as the bottom PCB, but with track cuts and the power supply end cut off...

A “interesting” and crude way of cutting costs :lol:

Mark
Yes, the top half is a sawn off bit of the bottom half.
B2A087F8-160A-4527-9E84-AF517BA7EBF1.jpeg
by DutchAcorn
Sun Dec 02, 2018 6:12 pm
Forum: hardware
Topic: Sharing a Disk Drive
Replies: 21
Views: 1529

Re: Sharing a Disk Drive

1024MAK wrote:
Sun Dec 02, 2018 10:17 am
Don’t stop there, whip it’s cover off! :lol:

We all want to ogle it’s insides...

Mark
by DutchAcorn
Sat Dec 01, 2018 10:10 pm
Forum: hardware
Topic: Sharing a Disk Drive
Replies: 21
Views: 1529

Re: Sharing a Disk Drive

Sorry for the thread resurrection, but since it was the only relevant mention of a device similar to the one I recently got, I thought this thread was the right place. Apparently Watford was not the only one who made disc drive share boxes. Here’s one from Technomatic (not tested yet): 7ED6C9F4-75DB...
by DutchAcorn
Fri Nov 30, 2018 8:00 pm
Forum: hardware
Topic: Econet clock?
Replies: 15
Views: 488

Re: Econet clock testing...

Using *notify I tried to send a message across, but no luck. :? Should this work or is a socket box needed for this setup? Have you got NOTIFY on disk or in ROM? ... It seems I may have the basics wrong. I (probably wrongly) assumed that *notify was an NFS command contained in the NFS rom. *help is...
by DutchAcorn
Fri Nov 30, 2018 10:49 am
Forum: hardware
Topic: Econet clock?
Replies: 15
Views: 488

Re: Econet clock testing...

Using *notify I tried to send a message across, but no luck. :? Should this work or is a socket box needed for this setup? Have you got NOTIFY on disk or in ROM? ... It seems I may have the basics wrong. I (probably wrongly) assumed that *notify was an NFS command contained in the NFS rom. *help is...
by DutchAcorn
Thu Nov 29, 2018 7:57 pm
Forum: hardware
Topic: Econet clock?
Replies: 15
Views: 488

Re: Econet clock testing...

Today I got some econet cables so, unhindered by more than superficial knowledge of Econet networking, I connected an Econet fitted BBC on each of the connectors.

Using *notify I tried to send a message across, but no luck. :?

Should this work or is a socket box needed for this setup?
by DutchAcorn
Wed Nov 28, 2018 5:24 am
Forum: hardware
Topic: Electron Plus 3 Help
Replies: 17
Views: 357

Re: Electron Plus 3 Help

The attached one should be the right disk image.

You could consider getting the DVD from Electron World http://www.acornelectron.co.uk/c-dvd.html. It has a lot of disk images for the Electron.
by DutchAcorn
Tue Nov 27, 2018 2:49 pm
Forum: hardware
Topic: Need help with BBC just picked up please
Replies: 169
Views: 3073

Re: Need help with BBC just picked up please

traindriver69 wrote:
Tue Nov 27, 2018 2:45 pm
hi sorry a bit confused i thought the ram chips were IC55, IC56, IC60, IC61, IC64, IC65, IC66, IC67 but you say ic69
It is IC67. See here.
by DutchAcorn
Tue Nov 27, 2018 2:41 pm
Forum: hardware
Topic: Need help with BBC just picked up please
Replies: 169
Views: 3073

Re: Need help with BBC just picked up please

Voltmeter measurements on page 1 gave the following results for IC49 (which is connected to the D lines of all the RAM chips): IC49 pin 2 (D0) 2.15V pin 3 (D1): 2.17V pin 4 (D2): 2.14V pin 5 (D3): 2.19V pin 6 (D4): 2.14V pin 7 (D5): 2.15V pin 8 (D6): 2.10V pin 9 (D7): 0.13V This agrees with marcusj...
by DutchAcorn
Tue Nov 27, 2018 12:54 pm
Forum: hardware
Topic: Need help with BBC just picked up please
Replies: 169
Views: 3073

Re: Need help with BBC just picked up please

traindriver69 wrote:
Tue Nov 27, 2018 9:33 am
https://youtu.be/KuxioM1zq2M
Here is video running trickys test rom
Can bit 7 be stuck high? You would not really notice in Teletext mode?

I can’t see the diagonal lines clearly enough but they look a bit suspicious?

Can you post a few zoomed in pictures of the diagonal lines test screens?
by DutchAcorn
Mon Nov 26, 2018 7:59 pm
Forum: hardware
Topic: Need help with BBC just picked up please
Replies: 169
Views: 3073

Re: Need help with BBC just picked up please

From a logical perspective I've been pondering about this one. What functionality is critical for the B+ OS ROM but is not needed for the test ROM to function?

That would be
- the keyboard (checked)
- shadow RAM
- ...

Perhaps it's an idea to try a model B OS 1.2?
by DutchAcorn
Sat Nov 24, 2018 9:05 pm
Forum: hardware
Topic: Econet clock?
Replies: 15
Views: 488

Re: Econet clock?

... If I was going to use this for real I'd replace the 7805 with two terminal pins and connect a hacked USB cable to provide +5v directly - firstly because of the dodgy mains PCB tracks, and secondly because low voltage transformer power supplies with linear regulators are so 20th century. The PSU...
by DutchAcorn
Fri Nov 23, 2018 9:44 am
Forum: hardware
Topic: Need help with BBC just picked up please
Replies: 169
Views: 3073

Re: Need help with BBC just picked up please

traindriver69 wrote:
Wed Nov 21, 2018 12:37 pm
Hi
No nothing
From an other train of thought (keyboard related issue): do you get a mode 0 flashing cursor if you switch on with a disconnected keyboard?
by DutchAcorn
Wed Nov 21, 2018 12:25 pm
Forum: hardware
Topic: Need help with BBC just picked up please
Replies: 169
Views: 3073

Re: Need help with BBC just picked up please

Just to be clear; you don’t get any video output, right? Not a small blinking cursor in the top left?
by DutchAcorn
Mon Nov 19, 2018 10:23 pm
Forum: hardware
Topic: Econet clock?
Replies: 15
Views: 488

Re: Econet clock?

Looking at the other side of the pcb it seems there are even more similarities.
by DutchAcorn
Mon Nov 19, 2018 8:04 pm
Forum: hardware
Topic: Econet clock?
Replies: 15
Views: 488

Re: Econet clock?

Looks like it; the MC14411 is a bitrate generator, and the 75159 is common in Econet circuits. Hmm, the "Level 1 clock" documented at http://www.beebmaster.co.uk/Econet/ClockT1-6.html has the same 2 chips. Not sure how you'd change the speed on your one, though! Thanks! Yes, that looks similar. It ...
by DutchAcorn
Mon Nov 19, 2018 7:10 pm
Forum: hardware
Topic: Econet clock?
Replies: 15
Views: 488

Econet clock?

Got this with some other bits:
EA4B13CE-6143-40E4-B79D-C658EFEFA62F.jpeg
Can this be an Econet clock? There is nothing on the PCB...
by DutchAcorn
Mon Nov 19, 2018 2:22 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2707
Views: 232894

Re: Worth Taking a Look At

The seller simply has no idea that the Challenger is more than just a disc drive and will not have tested beyond that? Doubt it as the Challenger plugs into the 1MHz bus rather than the disk drive port. So, I don't think it can work with a regular DFS. Of course, it's possible that the seller has t...