Search found 254 matches

by bprosman
Mon Apr 15, 2019 8:33 pm
Forum: acorn atom and system
Topic: Atom Noise Killer @ 2MHz
Replies: 23
Views: 369

Re: Atom Noise Killer @ 2MHz

Great work Dave !!!
by bprosman
Fri Apr 12, 2019 7:26 pm
Forum: acorn atom and system
Topic: Atom Video to HDMI Adapter
Replies: 33
Views: 515

Re: Atom Video to HDMI Adapter

Interested as well.
by bprosman
Wed Apr 10, 2019 9:28 am
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 202
Views: 6111

Re: Atom 2k18 ?

Not that I am aware off. I'm interested in DIY cases as well. As I have some (original) boards without cases as well .
by bprosman
Mon Apr 08, 2019 7:40 pm
Forum: acorn atom and system
Topic: PL7 connector type and PL4 change
Replies: 4
Views: 117

Re: PL7 connector type and PL4 change

Any recommendations? Preferably with screen noise removal.
Personally I will go for Dave (Hoglets) one with the XC9572 but that one is external anyway.
by bprosman
Mon Apr 08, 2019 2:47 pm
Forum: acorn atom and system
Topic: PL7 connector type and PL4 change
Replies: 4
Views: 117

Re: PL7 connector type and PL4 change

If you change it to an angled IDC connector than you can access it via a cable without opening the case (PL4).
PL7 I would stick with the normal header (Male pins). As there is a board attached, attaching the board the wrong way around will be very hard.
by bprosman
Tue Mar 26, 2019 10:35 am
Forum: hardware
Topic: 6847 Tester
Replies: 3
Views: 225

Re: 6847 Tester

Thanks both for your very valuable reply.
by bprosman
Mon Mar 25, 2019 7:29 pm
Forum: hardware
Topic: 6847 Tester
Replies: 3
Views: 225

6847 Tester

Found this "on the net", does anyone can (and wants to) explain briefly how they work ?
mc6847test.png
And the 2nd (IC1 is an Eprom).
55719298_698983820503780_7307952107582128128_n.png
Thanks a lot for the effort.
by bprosman
Thu Mar 14, 2019 2:21 pm
Forum: community projects
Topic: Merging scans
Replies: 3
Views: 107

Re: Merging scans

Hi Roland,

I can scan A3/A4 to all kinds of formats.
Was hoping for a smart way to “glue them together”
by bprosman
Thu Mar 14, 2019 9:53 am
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 202
Views: 6111

Re: Atom 2k18 ?

Bit off-topic but would this (Atom) design also fit in this Board ?
It is a :
EP2C5T144 Learning Board System Development Board ALTERA FPGA CycloneII

Grant Saerle made some Z80 stuff with this :
http://searle.hostei.com/grant/Multicomp/
IMG_0106.jpg
by bprosman
Thu Mar 14, 2019 9:43 am
Forum: community projects
Topic: Merging scans
Replies: 3
Views: 107

Merging scans

Sorry , might belong here more :

Looking for hints/tips/tricks and experiences in merging (schematic) scans. I have some Apple II schematics that are larger than A3.
Anyone experience with this ?

Kind regards, Bram
by bprosman
Sun Mar 10, 2019 11:44 am
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 202
Views: 6111

Re: Atom 2k18 ?

Or this one, only requires 1 (SMD) transistor.
https://www.nxp.com/docs/en/application ... N10441.pdf

Its bi-directional.
by bprosman
Tue Mar 05, 2019 10:26 am
Forum: acorn atom and system
Topic: System Clone design files....
Replies: 8
Views: 574

Re: System Clone design files....

Hi Phill,

What toolchain do you use to compile the Keyboard (AVR) files ?
Atmel Studio ? Or "native" AVRgcc ?

Kind regards, Bram
by bprosman
Mon Mar 04, 2019 3:04 pm
Forum: acorn atom and system
Topic: Atom 2k18 ?
Replies: 202
Views: 6111

Re: Atom 2k18 ?

There are multiple sources for this board :
https://www.ebay.com/itm/Xilinx-FPGA-Sp ... :rk:1:pf:0
by bprosman
Sun Mar 03, 2019 7:32 am
Forum: acorn atom and system
Topic: AtomColour sync problems, tearing my hair out with this :(
Replies: 32
Views: 790

Re: AtomColour sync problems, tearing my hair out with this :(

For me a clean Windows 7 install and an Ebay (Chinese) cable with ISE 14.7 worked. Didnt get it to work properly in a VM (Oracle virtualbox and HP laptop)
by bprosman
Sun Mar 03, 2019 7:28 am
Forum: acorn atom and system
Topic: Replacing the System's INS8154 with a 6522 VIA
Replies: 6
Views: 248

Re: Replacing the System's INS8154 with a 6522 VIA

Otherwise a few transistors to increase the source current ?
by bprosman
Sat Mar 02, 2019 10:08 am
Forum: acorn atom and system
Topic: Acorn Atom case (ideas)
Replies: 5
Views: 305

Re: Acorn Atom case (ideas)

Recycling a Beeb might be an option , I do have a few but my brain / stomach still didn't recover from seeing horrible pictures on the Internet (and what has been seen cannot be unseen :( ) from "a certain person" who's name I wont mention here chopping of an Atom board with a grinder and has gone w...
by bprosman
Fri Mar 01, 2019 3:24 pm
Forum: acorn atom and system
Topic: Acorn Atom case (ideas)
Replies: 5
Views: 305

Acorn Atom case (ideas)

As we all know Acorn Atom cases are pretty scarse. This together with some initiatives I see coming up on FB on remaking Acorn Atom PCB's I am looking for idea's , thoughts, aternatives for nice cases and the keyboard. One option could be the atom in a "shoebox" case with an external (PS2?) keyboad....
by bprosman
Tue Feb 19, 2019 9:50 am
Forum: acorn atom and system
Topic: A Website dedicated to the Acorn System Computers
Replies: 21
Views: 809

Re: A Website dedicated to the Acorn System Computers

Otherwise I can volunteer to provide some hosting space.
I own the domain "retrocomputing.nl"
by bprosman
Sat Feb 16, 2019 9:17 am
Forum: acorn atom and system
Topic: AtomColour sync problems, tearing my hair out with this :(
Replies: 32
Views: 790

Re: AtomColour sync problems, tearing my hair out with this :(

@Kees,

How does it work on a CRT ?

Kind regards, Bram
by bprosman
Sat Feb 02, 2019 11:38 am
Forum: acorn atom and system
Topic: Acorn System 1 TinyCAD and VeeCAD
Replies: 26
Views: 1047

Re: Acorn System 1 TinyCAD and VeeCAD

Dear all, Today i uploaded my (sort of Final) Kicad files to : https://github.com/bprosman/Acorn_System1_Revival Feel free to use them as a starting point. Myself I am going a different route, I still want to design an Acorn System X , 6502 Euro-card board. But I also want it to be reproducible. So ...
by bprosman
Wed Jan 23, 2019 2:26 am
Forum: acorn atom and system
Topic: System Clone design files....
Replies: 8
Views: 574

Re: System Clone design files....

Thanks Phill for publishing these !

Kind regards, Bram
by bprosman
Sun Jan 20, 2019 7:29 am
Forum: acorn atom and system
Topic: Acorn System CPU board question
Replies: 10
Views: 426

Re: Acorn System CPU board question

Im not intending to either but then my drawing is at least correct.
by bprosman
Sat Jan 19, 2019 7:37 pm
Forum: acorn atom and system
Topic: Acorn System CPU board question
Replies: 10
Views: 426

Re: Acorn System CPU board question

Thanks for your assistance Kazzie, corrected my schematic.
by bprosman
Sat Jan 19, 2019 4:10 pm
Forum: acorn atom and system
Topic: Acorn System CPU board question
Replies: 10
Views: 426

Re: Acorn System CPU board question

Working on the Keyboard/Display/Cassette part I spot another error in the original schematic.
Who knows what to take, the pin naming or numbering ?
Inconsequence_Cassette.JPG
by bprosman
Sat Jan 19, 2019 10:48 am
Forum: acorn atom and system
Topic: Acorn System 1 TinyCAD and VeeCAD
Replies: 26
Views: 1047

Re: Acorn System 1 TinyCAD and VeeCAD

Hope as well, this is my latest version :
Acorn_Sytem_1.pdf
(101.13 KiB) Downloaded 26 times
by bprosman
Sat Jan 19, 2019 9:50 am
Forum: acorn atom and system
Topic: Acorn 6502 revival
Replies: 11
Views: 526

Re: Acorn 6502 revival

Hi Mark,

Understood that but as it wasn't final yet it was just a teaser.
Final version of the CPU board here.
I will put it on my website as well and make a reference to it as a Kicad design.
Acorn_Sytem_1.pdf
(101.13 KiB) Downloaded 15 times
Kind regards, Bram
by bprosman
Sat Jan 19, 2019 7:30 am
Forum: acorn atom and system
Topic: Acorn System CPU board question
Replies: 10
Views: 426

Re: Acorn System CPU board question

Hi Trevor, @1, Yes did that in my early days as well, even with EPROMS to "confuse" others :wink: . @2, I doubt if a 2708 ever has been an option as that requires 3 supply rails, +5V, +12V and -5V. So guess the 2516 or 2716 is the minimum. In that case I keep pin A10 connected to A10 and remove it f...
by bprosman
Fri Jan 18, 2019 9:04 pm
Forum: acorn atom and system
Topic: Acorn System 1 TinyCAD and VeeCAD
Replies: 26
Views: 1047

Re: Acorn System 1 TinyCAD and VeeCAD

Getting there :
V0_5.JPG
by bprosman
Fri Jan 18, 2019 7:57 pm
Forum: acorn atom and system
Topic: Acorn 6502 revival
Replies: 11
Views: 526

Re: Acorn 6502 revival

Thanks Kazzie, really appreciated and definitively I will use it.

Getting there. Pending a few questions in :
viewtopic.php?f=44&t=16359
V0_5.JPG