Search found 4338 matches

by roland
Tue Jul 27, 2021 3:55 pm
Forum: general
Topic: Today I received.....
Replies: 6355
Views: 797452

Re: Today I received.....

Thank you all for your kind wishes :D
by roland
Mon Jul 26, 2021 5:04 pm
Forum: general
Topic: Today I received.....
Replies: 6355
Views: 797452

Re: Today I received.....

A new book (and some other gifts) for my birthday \:D/
image.jpg
by roland
Sun Jul 25, 2021 10:38 pm
Forum: for sale / freebies
Topic: Pegasus 400 - Electron Disc Interface - Now available - 19-07-21
Replies: 11
Views: 405

Re: Pegasus 400 - Electron Disc Interface - Now available - 19-07-21

Separately, how much would it take to produce a version that plugs directly into the Elk expansion port? Cant help thinking that there are owners who would like to use the likes of a GOTECH but cannot not get hold of a plus 1. They can use a Minus One. That plugs directly into the expansion connect...
by roland
Sun Jul 25, 2021 8:07 pm
Forum: for sale / freebies
Topic: BBC Modem 84
Replies: 0
Views: 64

BBC Modem 84

I bought this modem because I can use the case for a new project. I probably cannot use it so for me only the case is suitable. However, it is in such a mint condition that I feel bad about destroying it before offering it here. Price €22,50 plus P&P (shipping world wide). modem-3.jpg modem-2.jp...
by roland
Sun Jul 25, 2021 7:53 pm
Forum: general
Topic: Today I received.....
Replies: 6355
Views: 797452

Re: Today I received.....

It had been a long time ago since I got my last wasp sting. On the other side, I daily receive mosquito bites. And each and every bite has more side effects than both my covid-19 jabs :lol:
by roland
Fri Jul 23, 2021 5:29 pm
Forum: for sale / freebies
Topic: Electron ATI (Advanced Tube Interface) Now available - 19-07-21
Replies: 6
Views: 281

Re: Electron ATI (Advanced Tube Interface) Now available - 19-07-21

That's offered two post above yours :mrgreen:

Perhaps you can combine the shipment to the Netherlands, especially if there are other Dutch members interested. I'm not interested in this one because I already have a Tube and RAM expansion for my Electron.
by roland
Tue Jul 20, 2021 12:40 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

Yes I did.

The voltage on every ic is 4.94V
by roland
Mon Jul 19, 2021 10:31 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

Yes, I have cleaned the female edge connector. I also used some sand paper to make the contacts blank again. The silly thing is that I could read the rom until today. Things were getting better but it suddenly stopped working again. We’ll see what the effect is of replacing ic3.
by roland
Mon Jul 19, 2021 8:56 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

The reset line is fine. When BREAK is pressed, it goes low and back high after BREAK is released. The Elk does also hang when the ROM and FDC are removed and IC12 is fitted. When I remove IC12 then the Elk is working fine. However, when I connect the Plus1 to this setup, the Elk is hanging again. Th...
by roland
Mon Jul 19, 2021 5:11 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

Today I switched on the power on my "work bench" and I picked up an Electron that was located on top of my other Electron. Then I heard a normal start-up beep on the Electron. I switched on the monitor and it had "Acorn ADFS" on the screen \:D/ My problem is related to the start ...
by roland
Sat Jul 17, 2021 4:38 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

I’ll try those later this week.
by roland
Sat Jul 17, 2021 3:34 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

There's no difference in the boot with or without the resistor. It's ADFS 1.00 (the original ROM).

I even doubt whether the ADFS even polls the 1770 because I can't see any pulses on the cs line of the 1770 after a reset. When I do a continuous read of &FCC5 I do see pulses.
by roland
Sat Jul 17, 2021 3:02 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

hoglet wrote:
Sat Jul 17, 2021 9:34 am
It might be worth trying a 4K7 pullup on D0 on the 1770 (i.e. that side of the data bus buffer).
What do you see if you run the following:
Either with or without the resistor I get 5A FF which are the values that I expect to read.
by roland
Fri Jul 16, 2021 11:02 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

Thanks, I will have a look at the 1770 and its supporting logic.
by roland
Fri Jul 16, 2021 8:12 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

Now I have reached a situation that I don't quite understand. I have replaced both IC9 and IC12. Since the 28 pin socket did show some corrosion I replaced them also. Now I have put the thing back together but the Electrons still doesn't recognise the ADFS ROM. No banner at power on or CTRL+BREAK. H...
by roland
Tue Jul 13, 2021 10:01 pm
Forum: 8-bit acorn emulators
Topic: The incredible MESS of Atom file formats
Replies: 13
Views: 527

Re: The incredible MESS of Atom file formats

This, however, worked! Can't believe I didn't think of it. So far every game I've tried boots like this, although playing them is another matter entirely due to the crazy keyboard - the controls on Snapper, for example, appear to be 3 for left, G for right, - for down and Q for up :lol: You have th...
by roland
Tue Jul 13, 2021 7:48 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Re: Plus3 problem

For some reason I completely missed your answers :oops: I made a note on my diagram that pin 2 of the 74LS74 was always high and that pin 6 is also always high. On pin 3 there are (clock) pulses. So there must be something wrong with that flip-flop. I'd expect pin 6 to be low if there's a high D inp...
by roland
Sun Jul 11, 2021 9:57 pm
Forum: 8-bit acorn hardware
Topic: Plus3 problem
Replies: 22
Views: 588

Plus3 problem

I recently got a Plus-3 for my Electron but unfortunately it does not work. After power on, the Electron displays just a block pattern on the screen but starts to work normally after I press CTRL+BREAK. I can live with that. However, the Electron works a bit too normally because it does not print an...
by roland
Sun Jul 11, 2021 4:53 pm
Forum: acorn atom and acorn system series
Topic: EF9345 based video card
Replies: 23
Views: 644

Re: EF9345 based video card

Try roland@acornatom.nl :mrgreen: I have one unused Atom 80 column board with EF9345 available. I probably won't use it any more so if you want to do something useful with it then I am willing to offer it for a friendly price. On the other hand, on Ali there are stores which offer them for less than...
by roland
Fri Jul 09, 2021 7:54 pm
Forum: acorn atom and acorn system series
Topic: EF9345 based video card
Replies: 23
Views: 644

Re: EF9345 based video card

I have converted the sources to text files so you can easily read them or convert them to beebasm or whatever. JVDU0.0 is a very straight forward driver that supports only a basic 80/40 column mode without using (m)any features of the EF9345. Lacking those features makes this driver very fast. This ...
by roland
Fri Jul 09, 2021 9:05 am
Forum: acorn atom and acorn system series
Topic: EF9345 based video card
Replies: 23
Views: 644

Re: EF9345 based video card

Dominic, did you have a look at the VDU sources for the Atom? They can be very educational. If you want I can convert them to plain text and post them here.
by roland
Thu Jul 08, 2021 11:23 pm
Forum: introduce yourself
Topic: Getting the 8k prom
Replies: 4
Views: 173

Re: Getting the 8k prom

Does this concern an Atom? I probably have an original ROM available….
by roland
Thu Jul 01, 2021 1:19 pm
Forum: acorn atom and acorn system series
Topic: Acorn Atom Bootstrap pcb...
Replies: 7
Views: 176

Re: Acorn Atom Bootstrap pcb...

Replacing the MOS ROM was easier and cheaper and it worked also with a BBC Basic card installed. This is the first Atom I've ever seen with such a board installed. But I am not going to bid for it :lol: I'm just wondering who FK from Heerlen (the seller) is .... I might know him from the user group ...
by roland
Wed Jun 30, 2021 9:37 pm
Forum: other events + general event chat
Topic: Dutch TechSat on August 28, 2021
Replies: 2
Views: 233

Dutch TechSat on August 28, 2021

On Saturday 28 August we want to organize another Technical Saturday. This event will take place in community center "Triton" in Vaassen (Jasmijnstraat 36) from 11:00 - 17:00. Of course we will stick to the measures in force against Covid-19 at that time. With our pre-registrations we now ...
by roland
Tue Jun 29, 2021 9:14 pm
Forum: 8-bit acorn software: other
Topic: WiDFS released
Replies: 6
Views: 624

Re: WiDFS released

Thanks for your nice feed back. Just the fact that it entertains you a whole evening makes me smile :)
by roland
Fri Jun 25, 2021 11:24 am
Forum: acorn atom and acorn system series
Topic: Atom speed benchmark....
Replies: 21
Views: 571

Re: Atom speed benchmark....

Your program has to be short enough to run within one VSYNC cycle or must count the cycles but that takes time. Benchmarking the calculation of 1000 Pi decimals in Basic won't work here :lol: But a simple counter loop should be working.
by roland
Fri Jun 25, 2021 10:15 am
Forum: acorn atom and acorn system series
Topic: Atom speed benchmark....
Replies: 21
Views: 571

Re: Atom speed benchmark....

The Atom is already in the results as you can see in this table: Screenshot 2021-06-25 at 11-10-57 Rugg Feldman benchmarks - Wikipedia.png It performs quite well. The table notes that the BBC Micro was the fastest of the 8-bit Basics. Can you imagine who won this "contest" if the Atom was ...
by roland
Sun Jun 20, 2021 9:19 pm
Forum: programming
Topic: Printing ROM title at startup
Replies: 21
Views: 903

Re: Printing ROM title at startup

I use this in my ElkWiFi ROM: \ This routine initializes the rom and the hardware. It is the response to reason code &01 since reason \ code &03 might be claimed by another higher priority rom. To avoid my banner being printed before the operating \ system banner, this is suppressed and repl...

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