Search found 2884 matches

by roland
Mon Aug 20, 2018 8:03 pm
Forum: off-topic
Topic: Printing a capacitor
Replies: 9
Views: 225

Re: Printing a capacitor

I will have to take a closer look at the printer. Now I''m printing a minion for a test but that one also fails. After printing the bottom grid there are no more layers although the printer is still busy printing nothing. Maybe the PLA feed gets stuck so it can't print any more.
by roland
Mon Aug 20, 2018 6:58 pm
Forum: off-topic
Topic: Printing a capacitor
Replies: 9
Views: 225

Re: Printing a capacitor

I got my printer up and running but the printed result is not quite what I expected.....

IMG_3173.jpg
by roland
Sun Aug 19, 2018 10:20 am
Forum: off-topic
Topic: Printing a capacitor
Replies: 9
Views: 225

Re: Printing a capacitor

Thanks for your efforts. I think the heat won't be a big problem because other attempts to make new old capacitors are working with the same principle: make a new housing either by wood, pvc (electricity pipes) or even with clay. I downloaded your design and tried to print it. Unfortunately my 3D pr...
by roland
Sat Aug 18, 2018 3:46 pm
Forum: off-topic
Topic: Printing a capacitor
Replies: 9
Views: 225

Printing a capacitor

As some of you might know, I also repair old radios. Currently I'm working on a Philips 208U-45 (march 1946) and it has some bad capacitors - just like many beebs from that era ;) Now I want to replace these bad capacitors with new ones, but they are so yellow.... There are many ways to reconstruct ...
by roland
Tue Aug 14, 2018 10:07 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

hoglet wrote:
Tue Aug 14, 2018 3:38 pm
Sorry I can't be more help!
O sure you can be more help :)

I tried to add my cpld files to the Atom Godil project in ISE but it did not recognise these files. Even when I force an error ( keyword: entyty ) there was no error. How can I add my two sources?
by roland
Tue Aug 14, 2018 2:36 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

How on earth can a design with 302 warnings still work?
ISE-Godil.png
Can I safely ignore these warnings or do I have to tune my ISE application a bit? I'm using ISE 14.7 on Linux and I just cloned the Godil code from github.
by roland
Tue Aug 14, 2018 11:32 am
Forum: acorn atom
Topic: Atom Speed test
Replies: 4
Views: 73

Re: Atom Speed test

I think that counting flybacks is quite difficult because the flyback does not generate an interrupt. So the program must self keep track of the flyback state. And it is not very accurate.

However, I don’t have a better solution...
by roland
Mon Aug 13, 2018 7:29 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

I have been doing some counting about the pins and the FPGA module has enough I/O ports for replacing the Godil and the two CPLD's. The module has 72 I/O ports and I need 70 ports. I will soon try to merge my CPLD code into the Atom Godil files and check if that still compiles without errors... It w...
by roland
Sat Aug 11, 2018 8:32 pm
Forum: acorn atom
Topic: Atomulator Keyboard
Replies: 3
Views: 104

Re: Atomulator Keyboard

That is correct, the * on an Atom looks more like a 45 degrees rotated square or a small diamond :)
by roland
Wed Aug 08, 2018 9:58 pm
Forum: acorn atom
Topic: Building an Acorn System 1
Replies: 13
Views: 496

Re: Building an Acorn System 1

My Atom 2k14 lacks the two inverters at phi2 and it works perfectly without them. But maybe that is because of the faster, modern components used.
by roland
Tue Aug 07, 2018 8:54 pm
Forum: general
Topic: Which killer app made you buy a BBC?
Replies: 10
Views: 363

Re: Which killer app made you buy a BBC?

For me it was basic and the operating system. I was relocating the basic for my Atom-in-PC card and I needed some references. Afaik there was no emulator back in 1998 so I borrowed a real BBC and later I could keep it.
by roland
Thu Aug 02, 2018 2:50 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

I have ordered a Spartan board to do some experiments. Because most people want an Atom with a real CPU, VIA etc I do not want to implement these in the FPGA as well but I am considering to implement the glue logic (CPLD's) into this FPGA - that would reduce the total costs and make the board design...
by roland
Wed Aug 01, 2018 3:30 pm
Forum: acorn atom
Topic: An unknown Acorn Atom Clone found?
Replies: 10
Views: 451

Re: An unknown Acorn Atom Clone found?

Yep. 49 kilopixels. It really would be nice to find some more documentation of this system because it might be possible to run the roms on the Atom2k15. Well, at least partly. I should find out where the 6847 is set up and how the keyboard is scanned. And then, with one ROM at #Axxx and the rest at ...
by roland
Wed Aug 01, 2018 3:10 pm
Forum: acorn atom
Topic: An unknown Acorn Atom Clone found?
Replies: 10
Views: 451

Re: An unknown Acorn Atom Clone found?

Kazzie wrote:
Wed Aug 01, 2018 3:03 pm
From the advert: "Grafica multimodo 49.152 pixel" - 49.152 pixel multimode graphics? What's that when it's at home?
It's just 256 x 192 pixels (like the Atom CLEAR4) :)
by roland
Wed Aug 01, 2018 2:28 pm
Forum: acorn atom
Topic: An unknown Acorn Atom Clone found?
Replies: 10
Views: 451

Re: An unknown Acorn Atom Clone found?

Well, they did a very good job on copying the Atom's keyboard :mrgreen: The only differences are: RET and DEL are swapped BREAK key missing (reset is at the back which might be an advantage :lol: Other items not on the Atom are the serial port and the disk interface connector. Nice computer anyway.
by roland
Tue Jul 31, 2018 6:58 am
Forum: acorn atom
Topic: Econet Card on Ebay
Replies: 13
Views: 402

Re: Econet Card on Ebay

In an unexpanded Atom you can also use an eprom (2532) at #Exxx by piggy packing it on another rom and connect the cs pin to ic23 pin 9. Remove ic4 to avoid conflicts on the data bus as #Exxx is meant to be outside the Atom. That way you can have both the MMC rom and the Econet rom. Or contact me fo...
by roland
Fri Jul 27, 2018 5:45 pm
Forum: acorn atom
Topic: Acorn Atom on Ebay
Replies: 13
Views: 503

Re: Acorn Atom on Ebay

Some kind of CTRL code in line 120?
by roland
Fri Jul 27, 2018 5:09 pm
Forum: acorn atom
Topic: Acorn Atom on Ebay
Replies: 13
Views: 503

Re: Acorn Atom on Ebay

How on earth does this guy manage it to get errors on this two line programme :lol:

s-l1600.jpg
How hard can I be?
by roland
Wed Jul 25, 2018 9:19 am
Forum: acorn atom
Topic: Econet Card on Ebay
Replies: 13
Views: 402

Re: Econet Card on Ebay

Kazzie wrote:
Wed Jul 25, 2018 8:30 am
One thing is certain though: There have been two bids within half an hour of you posting, so it seems to have worked!
I thought, give it a try :mrgreen:
by roland
Tue Jul 24, 2018 4:57 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

hoglet wrote:
Tue Jul 24, 2018 4:08 pm
...but that's probably because I'm the only person that has ever used this!
Nope, I use DNLOAD regularly and UPLOAD very very very sometimes. When writing a larger programme for the Atom it's nicer to work on my Mac and then download the executable code to the Atom.
by roland
Tue Jul 24, 2018 3:03 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

I don't think you can program the device over USB. I assume that the USB is needed for powering the board during programming. The programming goes via the JTAG connector. IMHO..... Actually, a nice fix might be to drive the two Vin pins on the header via a schottky diode. Then no reverse powering w...
by roland
Tue Jul 24, 2018 12:16 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

hoglet wrote:
Mon Jul 23, 2018 9:42 pm
It's the USB connector that causes the problem, not the JTAG connnector.
I know that :lol: But if we do not use the USB for communication then the USB is only used for programming the device and then the board will be out of the Atom.
by roland
Mon Jul 23, 2018 9:38 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

It can, but see this post for some gotchas: Basically, if you connect the USB port and the Atom power is off, you end up trying to power the whole Atom via USB. That may well damage your laptop. At the moment I,don't see any reason why one would connect a laptop to that board. Especially when the j...
by roland
Mon Jul 23, 2018 9:26 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

bprosman wrote:
Mon Jul 23, 2018 9:07 pm
What Spartan board are you referring to Roland ?
I'm referring to this one: https://www.ebay.co.uk/itm/Xilinx-FPGA- ... 1640406811
by roland
Mon Jul 23, 2018 8:55 pm
Forum: acorn atom
Topic: Atom 2k18 ?
Replies: 41
Views: 1278

Re: Atom 2k18 ?

I had a short conversation with the seller of the Spartan boards and we can order those boards with either no headers soldered on in, or have them soldered on the bottom side of the pcb. That would make it possible to do in-circuit programming because the JTAG header should be at the top for inside ...
by roland
Thu Jul 19, 2018 6:54 pm
Forum: acorn atom
Topic: Acorn Atom on Eurocard
Replies: 8
Views: 385

Re: Acorn Atom on Eurocard

Bram, You should definitively visit an ABUG meeting where you can see a rack Atom :) . Furthermore I have a board and an AVR for connecting a ps/2 keyboard to the 7447 and 8255. And as soons as my holidays start I will investigate an alternative for the godil. You may also benefit from that.... Gree...
by roland
Tue Jul 17, 2018 7:27 am
Forum: introduce yourself
Topic: Atom Owner from Smalltown, Canada
Replies: 22
Views: 580

Re: Atom Owner from Smalltown, Canada

Hello Peter,

Welcome to this forum. Enjoy your visits here and find out what a great machine this little computer can be.

Greetings from the south of the Netherlands,
Roland
by roland
Tue Jul 10, 2018 9:48 pm
Forum: acorn atom
Topic: Acorn Atom and AtoMMC
Replies: 4
Views: 261

Re: Acorn Atom and AtoMMC

As far as I know the via is not required for an AtoMMC. But I wonder if that bbc card works well without a 6522 :-k Anyway RTB if you want to use that card, there is an improved version of the original MOS ROM at http://acornatom.nl/atomarch/acl2-12/mosrom. (You might have to skip the first 16 bytes...
by roland
Wed Jun 20, 2018 9:56 pm
Forum: software: new games
Topic: Atomic AGD
Replies: 67
Views: 3987

Re: Atomic AGD

Great work!
by roland
Thu Jun 14, 2018 8:37 pm
Forum: software: other
Topic: Using BBC BASIC on a Homebrew Computer
Replies: 9
Views: 588

Re: Using BBC BASIC on a Homebrew Computer

You can start by modifying the Atom BBC MOS rom as this contains most functions (api calls)!for running BBC Basic. I was looking for the source but I could not find it. With a decent mod rom you can run BBC Bacis with no modifications at all.

That is the way Acorn implemented BBC Bacic on the Atom.