Atom 2k18 ?

discussion of games, software, hardware & emulators relating to the Acorn Atom and Acorn System machines.
User avatar
marcusjambler
Posts: 647
Joined: Mon May 22, 2017 11:20 am
Location: Bradford
Contact:

Re: Atom 2k18 ?

Post by marcusjambler » Sat Sep 07, 2019 6:29 pm

I'm interested in a board please

User avatar
roland
Posts: 3311
Joined: Thu Aug 29, 2013 8:29 pm
Location: Born (NL)
Contact:

Re: Atom 2k18 ?

Post by roland » Sun Sep 08, 2019 9:08 am

IMHO there is already enough interest in a new MK2 board so I will start working on it. After I return from the ABUG in September I will order the boards. Perhaps there is more interest when people see it working at the meeting. The price per board will go down if there are more ordered.

It's also possible that I release the gember files so that one of you can order and distribute them in the UK. That seems quicker and cheaper to me compared to me ordering and posting the boards to the Netherlands and forward them to the UK.
256K + 6502 Inside
MAN WOMAN :shock:

Retrogadgets
Posts: 6
Joined: Mon Jul 22, 2019 3:19 pm
Location: Sheffield, UK
Contact:

Re: Atom 2k18 ?

Post by Retrogadgets » Tue Sep 10, 2019 6:50 pm

Hi. I would be interested in ordering the boards. I use jlcpcb and very reasonably priced.
Regards
Frank

Retrogadgets
Posts: 6
Joined: Mon Jul 22, 2019 3:19 pm
Location: Sheffield, UK
Contact:

Re: Atom 2k18 ?

Post by Retrogadgets » Tue Sep 10, 2019 6:52 pm

I'm in the UK.

User avatar
roland
Posts: 3311
Joined: Thu Aug 29, 2013 8:29 pm
Location: Born (NL)
Contact:

Re: Atom 2k18 ?

Post by roland » Tue Sep 10, 2019 8:26 pm

Retrogadgets wrote:
Tue Sep 10, 2019 6:50 pm
Hi. I would be interested in ordering the boards. I use jlcpcb and very reasonably priced.
Regards
Frank
JLCPCB made also the first batch and the quality of this multi-layer board is perfect.
256K + 6502 Inside
MAN WOMAN :shock:

User avatar
hoglet
Posts: 8445
Joined: Sat Oct 13, 2012 6:21 pm
Location: Bristol
Contact:

Re: Atom 2k18 ?

Post by hoglet » Wed Sep 11, 2019 10:35 am

Roland,

Continuing the reset discussion from here:
viewtopic.php?p=247588#p247588
(as it's Atom FPGA 2K18 specific)

I've rebuild the design Atom FPGA 2K18 with the latest commits (that last change was your work on adding Interrupts to the UART).

I've reprogrammed my FPGA.

For me, it always powers up as expected:
- original character set
- mouse pointer disabled

Here's the .mcs file if you would like to try it:
AtomFpga_Atom2K18.zip
(249.43 KiB) Downloaded 5 times
One question: doe you have C24 fitted or not? It should not make any difference as there is an internal power up reset. It's actually recommended to remove this capacitor, because the there are times when the FPGA pulls reset low. I don't have it fitted.

Dave

User avatar
roland
Posts: 3311
Joined: Thu Aug 29, 2013 8:29 pm
Location: Born (NL)
Contact:

Re: Atom 2k18 ?

Post by roland » Wed Sep 11, 2019 10:56 am

Hi Dave,

I will try your .mcs soon. And yes, in my Atom 2k18 is C24 fitted. I copied that from the original Atom and Atom 2k15 design but I didn't realize that it could influence the reset behaviour of the Atom 2k18.

I will first try your bitstream and if the problem does not disappear I will remove that capacitor too.

Greetings,
Roland
256K + 6502 Inside
MAN WOMAN :shock:

User avatar
hoglet
Posts: 8445
Joined: Sat Oct 13, 2012 6:21 pm
Location: Bristol
Contact:

Re: Atom 2k18 ?

Post by hoglet » Wed Sep 11, 2019 1:10 pm

roland wrote:
Wed Sep 11, 2019 10:56 am
I will first try your bitstream and if the problem does not disappear I will remove that capacitor too.
As I said, I don't think C24 is the problem, as I've temporarily tried fitting it and still cannot reproduce the bug.

It's still best to remove C24, as it's quite a big load for the FPGA to discharge when it needs to drive the bus reset, and consequently you will end up with slow edges.

See the discussion here:
viewtopic.php?p=236701#p236701

Dave
Last edited by hoglet on Wed Sep 11, 2019 3:36 pm, edited 1 time in total.

Retrogadgets
Posts: 6
Joined: Mon Jul 22, 2019 3:19 pm
Location: Sheffield, UK
Contact:

Re: Atom 2k18 ?

Post by Retrogadgets » Wed Sep 11, 2019 6:01 pm

Hi
I need numbers for a collective order of the Atom 2k18 from jlcpcb for interested parties in the UK.

Regards
Frank

User avatar
marcusjambler
Posts: 647
Joined: Mon May 22, 2017 11:20 am
Location: Bradford
Contact:

Re: Atom 2k18 ?

Post by marcusjambler » Wed Sep 11, 2019 9:33 pm

holds hand up for a UK board :D

User avatar
roland
Posts: 3311
Joined: Thu Aug 29, 2013 8:29 pm
Location: Born (NL)
Contact:

Re: Atom 2k18 ?

Post by roland » Wed Sep 11, 2019 9:40 pm

Dave,

I have installed your mcs file and I haven't seen the bug yet. I will keep an eye on it to see if it happens again.

Greetings,
Roland
256K + 6502 Inside
MAN WOMAN :shock:

Retrogadgets
Posts: 6
Joined: Mon Jul 22, 2019 3:19 pm
Location: Sheffield, UK
Contact:

Re: Atom 2k18 ?

Post by Retrogadgets » Thu Sep 12, 2019 8:57 pm

Retrogadgets wrote:
Wed Sep 11, 2019 6:01 pm
Hi
I need numbers for a collective order of the Atom 2k18 from jlcpcb for interested parties in the UK.

Regards
Frank
3 interested partis at the moment
Initial costs for 5 boards £14.51 plus £7.00 shipping to UK. Roughly £4.45 each Inc shipping.

User avatar
hoglet
Posts: 8445
Joined: Sat Oct 13, 2012 6:21 pm
Location: Bristol
Contact:

Re: Atom 2k18 ?

Post by hoglet » Thu Sep 12, 2019 9:06 pm

Retrogadgets wrote:
Thu Sep 12, 2019 8:57 pm
3 interested partis at the moment
Initial costs for 5 boards £14.51 plus £7.00 shipping to UK. Roughly £4.45 each Inc shipping.
Do you realize it's a 4-layer board?

I would expect the total price to be more like £40-£50 (+Shipping +Duty +VAT)

Dave
Last edited by hoglet on Thu Sep 12, 2019 9:13 pm, edited 3 times in total.

User avatar
roland
Posts: 3311
Joined: Thu Aug 29, 2013 8:29 pm
Location: Born (NL)
Contact:

Re: Atom 2k18 ?

Post by roland » Thu Sep 12, 2019 9:26 pm

Indeed, I paid about €100 for five boards after getting a partial refund of taxes :evil:
256K + 6502 Inside
MAN WOMAN :shock:

Retrogadgets
Posts: 6
Joined: Mon Jul 22, 2019 3:19 pm
Location: Sheffield, UK
Contact:

Re: Atom 2k18 ?

Post by Retrogadgets » Mon Sep 16, 2019 7:14 pm

hoglet wrote:
Thu Sep 12, 2019 9:06 pm
Retrogadgets wrote:
Thu Sep 12, 2019 8:57 pm
3 interested partis at the moment
Initial costs for 5 boards £14.51 plus £7.00 shipping to UK. Roughly £4.45 each Inc shipping.
Do you realize it's a 4-layer board?

I would expect the total price to be more like £40-£50 (+Shipping +Duty +VAT)

Dave
Yes would be more like £50.95 for 5 piece's of 4 layer board Inc shipping to UK.

User avatar
roland
Posts: 3311
Joined: Thu Aug 29, 2013 8:29 pm
Location: Born (NL)
Contact:

Re: Atom 2k18 ?

Post by roland » Mon Sep 16, 2019 8:36 pm

Just a small status update: I have worked out all mistakes, errors, faults and improvements into a MK2 design of the board. This design is now under revision and inspection by Hoglet. I expect to release the KiCad files next week after the ABUG meeting.
256K + 6502 Inside
MAN WOMAN :shock:

Post Reply