Search found 2122 matches

by DutchAcorn
Sat Sep 21, 2019 12:18 pm
Forum: acorn atom and system
Topic: just got two Atom's
Replies: 6
Views: 127

Re: just got two Atom's

... The 5 1/4 FDD has a default powerconnector with one wire connector to the PSU and the three other pins joint together going to a loose wire.. I thought the FDD would have a 5Vdc and a 12Vdc connection... Some digging to do :D Hmmm, can you clarify this a bit (picture)? With the 5.25” FDD are yo...
by DutchAcorn
Sat Sep 21, 2019 12:11 pm
Forum: introduce yourself
Topic: Hello from Bucks
Replies: 11
Views: 58

Re: Hello from Bucks

Welcome and enjoy your Elk! .... only problem is one dead key, so not too bad. It is most likely caused by light oxidation of the contacts inside the key switch. Before you heat up the soldering iron you can also just hammer it (with your finger, that is) for a few dozen times. Often that will get i...
by DutchAcorn
Sun Sep 15, 2019 8:17 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Extended and modified Atom (was "Faulty Atom")

/\ benny needs 2x1.5v AA batts to keep time, but think you will be using its port for a AtoMMC ! Check, got the batteries installed. But I only read the first page of the article describing the RTC board so I did not have the actual code to set the clock :oops: After typing in the code on the secon...
by DutchAcorn
Sun Sep 15, 2019 9:58 am
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Extended and modified Atom (was "Faulty Atom")

The modifications and software are described in this article in Acorn Nieuws (in Dutch). SOS stands for Switch board Operating System and was designed to be able to access all the commands in the support roms that are on the ram/rom board without manually having to select the specific rom (something...
by DutchAcorn
Fri Sep 13, 2019 9:06 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

I had some time to look into stuff. Thanks to the documentation Multiwizard pointed to I found out how to get the RAM/ROM board to work. Also found a disc (attached) with alternate OS images. Loading one of them (SOSHS3) at #1000 and pressing break (without shift) gets me this: atom bootstrap.JPG So...
by DutchAcorn
Thu Sep 12, 2019 4:49 pm
Forum: general
Topic: Today I received.....
Replies: 5410
Views: 418386

Re: Today I received.....

Those are well known boards: * A Big Benny real time clock * A 16kB ram extension board * A bank switching from board (schakelkaart) Nice Atom btw😀 Is documentation for these available anywhere? [-o< Hi Paul, http://www.acornatom.nl/hardware/index_hw.html Greetings, Wim... :-) Brilliant, thanks! =D>
by DutchAcorn
Thu Sep 12, 2019 11:36 am
Forum: general
Topic: Today I received.....
Replies: 5410
Views: 418386

Re: Today I received.....

roland wrote:
Sun Sep 08, 2019 9:18 am
Those are well known boards:

* A Big Benny real time clock
* A 16kB ram extension board
* A bank switching from board (schakelkaart)

Nice Atom btw😀
Is documentation for these available anywhere? [-o<
by DutchAcorn
Tue Sep 10, 2019 8:27 pm
Forum: general
Topic: Today I received.....
Replies: 5410
Views: 418386

Re: Today I received.....

The disc pack has it's power lead cut off, which is a bit of a worry. If the pack PSU would have deemed been beyond repair for this man it would be a challenge to fix. It may be the case that the mains lead was cut off to use on something else. Apart from the transformer, everything else in the PSU...
by DutchAcorn
Tue Sep 10, 2019 8:17 am
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

hoglet wrote:
Mon Sep 09, 2019 7:17 pm
...
It basically hands control over to a ROM at #1xxx unless the shift key is pressed.

This is consistent, I think, with what you have observed.

Dave
Thanks Dave! Good to know that it behaves as intended.
by DutchAcorn
Mon Sep 09, 2019 8:06 pm
Forum: general
Topic: Today I received.....
Replies: 5410
Views: 418386

Re: Today I received.....

Multiwizard wrote:
Sun Sep 08, 2019 10:07 am
...
Did you already take a peek what's on these floppy's? :D
...
There are over 30 floppies with some games, utilities, roms and languages (from a first peek).
by DutchAcorn
Mon Sep 09, 2019 6:58 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

Multiwizard wrote:
Mon Sep 09, 2019 11:38 am
Hi,

these modifications looks almost exactly the same as my modified CP/M IC23... :shock:


Greetings, Wim... :-)
Do you know what the modification in your computer is for?
by DutchAcorn
Mon Sep 09, 2019 6:57 pm
Forum: general
Topic: Today I received.....
Replies: 5410
Views: 418386

Re: Today I received.....

roland wrote:
Sun Sep 08, 2019 9:18 am
Those are well known boards:

* A Big Benny real time clock
* A 16kB ram extension board
* A bank switching from board (schakelkaart)

Nice Atom btw😀
I found a piece of “insulation” in the Atom that confirms this list nicely.
by DutchAcorn
Mon Sep 09, 2019 5:38 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

hoglet wrote:
Mon Sep 09, 2019 9:49 am
Could you run the following program, and take a clear photo?

Code: Select all

10 PRINT $12
20 FOR X=#FF10 TO #FFFF
30 A=?X
40 LINK #F802
50 NEXT
60 END
We can then see whether there are other OS ROM modifications.

Dave
This is the result:
by DutchAcorn
Mon Sep 09, 2019 4:14 am
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

Tonight I’ve been connecting some dots. Rom selection logic + CPU not processing = wrong OS selected? So I thought it might be a variation of the bootstrap logic that I have encountered earlier: https://stardot.org.uk/forums/viewtopic.php?f=3&t=10789&p=133077#p132767 Trying shift-break gets me this:...
by DutchAcorn
Sun Sep 08, 2019 8:19 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

hoglet wrote:
Sun Sep 08, 2019 8:06 pm
IC23, which does the ROM select decoding, looks like it's been modified significantly.

I'd try to understand what's that's trying to achieve.

Any chance of a close up photo of that area?

Dave
by DutchAcorn
Sun Sep 08, 2019 8:00 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

oss003 wrote:
Sun Sep 08, 2019 7:53 pm
Maybe this helps: viewtopic.php?f=44&t=6318&p=60505&hilit ... ion#p60505

Greetings
Kees
Thanks Kees, I'll try those.
by DutchAcorn
Sun Sep 08, 2019 7:58 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

hoglet wrote:
Sun Sep 08, 2019 7:51 pm
Paul,

Can you post a decent resolution photo of the current configuration you are testing.

Dave
by DutchAcorn
Sun Sep 08, 2019 7:49 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Re: Faulty Atom

If you need some extra 2114's just give me a sign Or even better: install Hoglet's noise killer board. For now you can borrow some 2114's from the program space, just not IC51/52 (IIRC) because those are the zero page. Does it beep when you press CTRL+G ? Thanks for the offer, Roland! Actually it c...
by DutchAcorn
Sun Sep 08, 2019 3:19 pm
Forum: acorn atom and system
Topic: Extended and modified Atom (was "Faulty Atom")
Replies: 29
Views: 590

Extended and modified Atom (was "Faulty Atom")

I have been working on the Atom that I got yesterday ( https://stardot.org.uk/forums/viewtopic.php?f=41&t=5594&start=5370#p247342 ). Regrettably it does not work yet. I have replaced the socket for IC31 and also replaced the IC for a known good one but the symptoms have not changed. I also replaced ...
by DutchAcorn
Sun Sep 08, 2019 7:16 am
Forum: general
Topic: Today I received.....
Replies: 5410
Views: 418386

Re: Today I received.....

An Acorn Atom. This belonged to a man that was great with electronics as well as engineering. The Disc Pack seems to need some TLC and the Atom currently does not work. I'll change the socket of IC31 and see if that improves things. It is fully expanded memory wise, I just removed some of the video ...
by DutchAcorn
Thu Sep 05, 2019 11:52 am
Forum: software: other
Topic: Advanced Quarter Meg Ram (AQR)—HELP !!!
Replies: 10
Views: 290

Re: Advanced Quarter Meg Ram (AQR)—HELP !!!

... Here are the details with plus1 and 3 connected and AQR in nearest slot. A86B1DC5-64C0-4033-9F34-8BB8A568A929.jpeg ... So the rear cartridge slot is 0/1, the nearest slot then must be 2/3. What if you try the same procedure (unlock using ?&FCFD=0 and *loadrom VIEW 0) with the AQR in the rear sl...
by DutchAcorn
Thu Sep 05, 2019 9:55 am
Forum: software: other
Topic: Advanced Quarter Meg Ram (AQR)—HELP !!!
Replies: 10
Views: 290

Re: Advanced Quarter Meg Ram (AQR)—HELP !!!

... Does any one out there have one of these ?...Do you have any utils to enable it and use it ? ... Well, yes, and I have written a small basic program that loads a ROM image into a given bank of the AQR using the instructions in the manual posted earlier. BUT I use a Master, not an Elk and I don'...
by DutchAcorn
Mon Aug 19, 2019 8:08 am
Forum: wanted
Topic: Wanted : 5.25 floppy disk drive
Replies: 2
Views: 186

Re: Wanted : 5.25 floppy disk drive

I have a drive you can have for p&p. It’s a dual 5.25” 40/80 disk drive with it’s own psu. Only one of the drives works (but works well) and the case has some rust. Please PM me if interested.
by DutchAcorn
Thu Aug 15, 2019 7:27 am
Forum: hardware
Topic: what's the use of Mode 0
Replies: 24
Views: 922

Re: what's the use of Mode 0

Coeus wrote:
Thu Aug 15, 2019 1:19 am
...

Given the teletext it would be an obvious candidate to consider. Would it not go fast enough for 80 columns?
This was discussed before in this thread: viewtopic.php?f=3&t=13177&p=209101
by DutchAcorn
Wed Aug 14, 2019 6:10 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2778
Views: 263238

Re: Worth Taking a Look At

Large (huge) collection of classic computers for sale on Dutch Marktplaats.
by DutchAcorn
Thu Aug 01, 2019 8:42 am
Forum: software: other
Topic: MMFS Version 2
Replies: 13
Views: 597

Re: MMFS Version 2

This is an excellent improvement! =D>

Combining this with Ultra DFS would make it even more extremely useful. 8)
geraldholdsworth wrote:
Wed Jul 31, 2019 8:47 am

What if you wanted to create a new disc image on the SD card, on the BBC side, and then copy data from a real disc?
Yes, that.
by DutchAcorn
Fri Jul 26, 2019 2:16 pm
Forum: hardware
Topic: BBC Model B - Issue 7 problem - Solved
Replies: 67
Views: 1517

Re: BBC Model B - Issue 7 problem

What happens if you remove the system via? Does it boot then (with continuous beep and no keyboard function)?
by DutchAcorn
Mon Jul 22, 2019 7:52 pm
Forum: hardware
Topic: BBC Model B - Issue 7 problem - Solved
Replies: 67
Views: 1517

Re: BBC Model B - Issue 7 problem

Could be memory related. Have you tried to boot with S25 set south and with the S25 jumper removed?

The cursor key is most likely a switch issue, possibly a dry solder joint for the key switch.
by DutchAcorn
Mon Jul 22, 2019 7:43 pm
Forum: hardware
Topic: Bbc b second beep lasts forever
Replies: 13
Views: 482

Re: Bbc b second beep lasts forever

It’s because you have hi-basic installed without a 6502 second processor. Remove that rom and you should be ok.
by DutchAcorn
Wed Jul 17, 2019 7:08 pm
Forum: introduce yourself
Topic: Nice to be here
Replies: 17
Views: 547

Re: Nice to be here

Welcome to Stardot! About the AQR, the documentation I have is attached. I never saw the actual support disk but I found that if you use the ACP Advanced 1770 DFS support for the AQR is integrated in the DFS (and you can also use it as a RAM drive). The good news is that it does not have a back-up b...