Search found 356 matches

by bprosman
Wed Nov 13, 2019 12:18 pm
Forum: wanted
Topic: Acorn System Replica boards
Replies: 14
Views: 303

Re: Acorn System Replica boards

They are “new compatible designs”, as it is using a CPLD (xc9536) for all the glue logic, as well as an IBM PS/2 keyboard interface. Same for the memory using (more) modern versions.
by bprosman
Tue Nov 12, 2019 8:19 pm
Forum: software: other
Topic: 6502 assembler for Windows/Linux
Replies: 8
Views: 220

Re: 6502 assembler for Windows/Linux

The latest TASM works perfectly in a DOS box under Windows 10.
https://www.retrocomputing.nl/elektors- ... -jm-eprom/
by bprosman
Tue Nov 12, 2019 6:20 pm
Forum: wanted
Topic: Acorn System Replica boards
Replies: 14
Views: 303

Re: Acorn System Replica boards

@Phill,

Do I see correct that the 74LS245 is mounted under the 6502 ? Assume this is direct on the board ?
And can you run the video board with just the 6845 and not the SAA5050 populated ?

Kind regards, Bram
by bprosman
Tue Nov 12, 2019 12:01 pm
Forum: wanted
Topic: Acorn System Replica boards
Replies: 14
Views: 303

Re: Acorn System Replica boards

Had them on the planning anyway. Will share what I have or make.
by bprosman
Tue Nov 12, 2019 10:21 am
Forum: wanted
Topic: Acorn System Replica boards
Replies: 14
Views: 303

Re: Acorn System Replica boards

If you like I can assist to make them in Kicad if Phill is ok woth that.

Kind regards, Bram
by bprosman
Mon Nov 11, 2019 9:22 pm
Forum: wanted
Topic: Acorn System Replica boards
Replies: 14
Views: 303

Re: Acorn System Replica boards

Could this be an option ?
viewtopic.php?f=44&t=16385
by bprosman
Mon Nov 11, 2019 12:36 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Not a Z80 expert at all but I cant find any more than 4.
TASM.ZIP
(16.33 KiB) Downloaded 1 time
by bprosman
Fri Nov 08, 2019 3:16 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Just realising I have a P2000 under my bed I might be able to add to the list.
Unfortunately health (concentration) wise I'm not up to speed (yet) :(
by bprosman
Fri Nov 08, 2019 1:29 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Nice work Dave :-)
Will this be a fix on the 0.90 version or does it get a 0.91 number ?

Kind regards, Bram
by bprosman
Wed Nov 06, 2019 6:25 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Going to test further tomorrow on the Z80 and 6502 coming weekend.
I wont use the 6809 and 65C02 (for now). Switches are unfortunately not in... packages from China nowadays take 4...5 weeks.

Thanks so far, you're going faster in releasing than I can keep up with building / testing :D
by bprosman
Wed Nov 06, 2019 4:13 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Hi Dave, Tried to recompile your /Dev version today (using a Windows 10 environment). In general this goes OK but the 65C02 as well as the 6809 version give me a bit of a worrying warning : WARNING:PhysDesignRules:2410 - This design is using one or more 9K Block RAMs (RAMB8BWER). 9K Block RAM initia...
by bprosman
Sat Nov 02, 2019 9:42 pm
Forum: acorn atom and system
Topic: Replica Atom
Replies: 32
Views: 1087

Re: Replica Atom

to be fair, the original hand-drawn Acorn schematic doesn't show exactly how the individual address and data lines are connected. Does this help ? Acorn-Atom-Board-01-Component-Side-1.jpg Acorn-Atom-Board-01-Solder-Side-1.jpg Acorn-Atom-Board-02-Component-Side-1.jpg Acorn-Atom-Board-02-Solder-Side-...
by bprosman
Wed Oct 30, 2019 8:29 am
Forum: acorn atom and system
Topic: Yarrb - redesigned
Replies: 54
Views: 1612

Re: Yarrb - redesigned

Its not that difficult. I did a 100 Pin version last year.
IMG_1133.jpg
by bprosman
Wed Oct 30, 2019 7:23 am
Forum: acorn atom and system
Topic: Yarrb - redesigned
Replies: 54
Views: 1612

Re: Yarrb - redesigned

Hi Roland,
Another supplier like "Allpcb" is not an option ?
by bprosman
Fri Oct 25, 2019 10:23 am
Forum: acorn atom and system
Topic: Yarrb - redesigned
Replies: 54
Views: 1612

Re: Yarrb - redesigned

I'm very curious to learn from your experience having the boards assembled.
by bprosman
Tue Oct 22, 2019 12:00 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

There was a discussion going on in one of the FB groups about this as well (maybe the same people :-) ). What I understand is that : /RFRSH is not tri-stated but also "not functional" when an external device is taking over the bus by a /BUSREQ signal. The Z80 datasheet I saw was referring to (long) ...
by bprosman
Mon Oct 21, 2019 10:49 am
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Thanks Dave,

With some (script) tweaking I was able to generate the new files myself now and with a Windows batch file generate the PROM file (instead of the shell script).
by bprosman
Sun Oct 20, 2019 11:36 am
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

More some general github questions. If they pollute this thread too much I can move it (or open a seperate one). I'm working on a Windows (10) environment. How can I keep up with Dave's latest developements ? Is that just a matter of running : git clone https://github.com/hoglet67/AtomBusMon.git ? A...
by bprosman
Sat Oct 19, 2019 3:25 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Single stepping using the ICE, or single stepping using the MPF monitor?
It would't surprise me if there is still an issue with the ICE single stepping on the MPF, because of the MPF's use of NMI and M1 cycle counting.
Single stepping on the MPF-1B.
Let me play with the other system first.
by bprosman
Sat Oct 19, 2019 2:38 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Today I finished my board for the Z80, the core that has been loaded is the multi-CPU version. For now I only did the basic testing : 1. Put in an MPF1-B, that boots fine. Did some single stepping but that ran into an SYS-SP error, that might be me though, as it was 35 years ago I used a MPF1-B 2. P...
by bprosman
Thu Oct 17, 2019 11:20 am
Forum: acorn atom and system
Topic: Yarrb - redesigned
Replies: 54
Views: 1612

Re: Yarrb - redesigned

Just a thought, if you are going to have it assembled (at least the SMD parts) , wouldnt be a small FPGA more flexible ?
Having that said realizing that level shifting would be the next issue.
by bprosman
Tue Oct 15, 2019 7:22 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Which GODIL do you have?
The 500's so I'm good anyway.
by bprosman
Tue Oct 15, 2019 6:35 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Is the EEPizza board bigger (core wise) than the Godil Dave ?

Kind regards, Bram
by bprosman
Sat Oct 12, 2019 11:01 pm
Forum: acorn atom and system
Topic: YARRB [SOLD OUT]
Replies: 265
Views: 16728

Re: YARRB [SOLD OUT]

What new toy.. ehh scope do you have Roland ?
by bprosman
Wed Oct 09, 2019 10:32 pm
Forum: acorn atom and system
Topic: A Website dedicated to the Acorn System Computers
Replies: 42
Views: 2002

Re: A Website dedicated to the Acorn System Computers

https://www.marktplaats.nl/q/19+inch+rack/
I have some 19" cases but shipping to the UK might be costly.
by bprosman
Wed Oct 09, 2019 8:04 pm
Forum: acorn atom and system
Topic: A Website dedicated to the Acorn System Computers
Replies: 42
Views: 2002

Re: A Website dedicated to the Acorn System Computers

Any other ideas where to get a eurocard frame welcomed!
In Holland they regularly appear on "Marktplaats" , a Dutch sort of eBay or one of the "Radio flea markets" that are there.
by bprosman
Fri Oct 04, 2019 6:58 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Here you are :
z80_adapter_bom.pdf
(29.95 KiB) Downloaded 22 times
by bprosman
Fri Oct 04, 2019 5:37 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

Hi Dave,

Does this mean that in a system with static RAM it is (more) stable ?
In that case I can build the adapter and test it in my MPF-1B.

Kind regards, Bram
by bprosman
Fri Oct 04, 2019 1:59 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

And... we have a lift-off :-) The 6502 board works nice in an MPS-65 as well as in my Atom : http://retro.hansotten.nl/6502-sbc/msp-65-2-thaler/ On my board I did not fit the 3 single-signal level shifters , main reason, I did not have them :wink: Second reason , I never have used the trigger option...
by bprosman
Thu Oct 03, 2019 3:48 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 745
Views: 62312

Re: ICE T65/Z80/6809

I can test in an MPF-1B.

Kind regards, Bram