Search found 307 matches

by bprosman
Mon Jan 14, 2019 11:06 am
Forum: acorn atom and system
Topic: Acorn System 1 TinyCAD and VeeCAD
Replies: 26
Views: 1506

Re: Acorn System 1 TinyCAD and VeeCAD

Does anyone have a link to the latest schematics ?
by bprosman
Sun Jan 13, 2019 5:24 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 236
Views: 35262

Re: Atom Colour Board Thread

Is the full design somewhere published Phill ?

Kind regards, Bram
by bprosman
Sun Jan 13, 2019 2:18 pm
Forum: acorn atom and system
Topic: Acorn System 1 TinyCAD and VeeCAD
Replies: 26
Views: 1506

Re: Acorn System 1 TinyCAD and VeeCAD

Using Kicad regurarey myself, so if you need any help. What was the basic (original) schematic you worked from ? Came from the SmArtwork, Orcad/Ultiboard, Layo, Protel99, Altium, Kicad route myself. Never got used to Eagle, for me the most non-intuitive program there is. Altium is still the holy gra...
by bprosman
Sat Dec 29, 2018 11:34 am
Forum: development tools
Topic: Looking for a 6502 disassembler for reverse engineering
Replies: 21
Views: 1267

Re: Looking for a 6502 disassembler for reverse engineering

Thanks for the responses so far, looks indeed like the same board.
What are you trying to find out about it?
Try to reverse engineer it.
by bprosman
Sat Dec 29, 2018 10:16 am
Forum: development tools
Topic: Looking for a 6502 disassembler for reverse engineering
Replies: 21
Views: 1267

Looking for a 6502 disassembler for reverse engineering

Helping someone to reverse engineer a 6502 SBC. It has a 6052 processor, a 2K EPROM from F800-FFF, and a 2K Ram and 6522 "somewhere in the memory map". The memory decoding prom (82S129) is still to be read. Any suggestion of a disassembler/emulator ?. I have the monitor in .HEX and .BIN format. For ...
by bprosman
Tue Dec 18, 2018 11:38 am
Forum: hardware
Topic: Logic Levels for 5V TTL Systems
Replies: 11
Views: 1065

Re: Logic Levels for 5V TTL Systems

@Flynnjs,

Think I nailed it, put an extra (10uF Tantalium) capacitor on the power line and a 1K resistor in series with the clock signal. Its running now already for more than 15 hours without freezing.

Kind regards, Bram
by bprosman
Tue Dec 04, 2018 4:01 pm
Forum: acorn atom and system
Topic: Trying to get a Godil powered Atom alive
Replies: 6
Views: 426

Re: Trying to get a Godil powered Atom alive

Final bit, some text to recognize the direction. Some cover to avoid "bits falling in" where the connector pins are still (sort of) accessible.
IMG_7698.JPG
Net step, a similar Z80 version and Dave "Hoglet"'s level shifter board to get this to work with the "EE_Pizza" board as well.
by bprosman
Tue Dec 04, 2018 10:45 am
Forum: acorn atom and system
Topic: Trying to get a Godil powered Atom alive
Replies: 6
Views: 426

Re: Trying to get a Godil powered Atom alive

And we have a lift-off :D
So my simple adapter board is confirmed to work.
Thanks for all your help and patience Dave, next stage EE-Pizza and real level shifters.
IMG_7687.JPG
IMG_7688.JPG
by bprosman
Tue Dec 04, 2018 8:01 am
Forum: acorn atom and system
Topic: Trying to get a Godil powered Atom alive
Replies: 6
Views: 426

Re: Trying to get a Godil powered Atom alive

Is that a hint to get that finished as well Dave ? 😃😃😃😃😃
by bprosman
Mon Dec 03, 2018 11:31 pm
Forum: acorn atom and system
Topic: Trying to get a Godil powered Atom alive
Replies: 6
Views: 426

Re: Trying to get a Godil powered Atom alive

Tried a X250 version (original DIL socket Godil, with 250 Image) same result.
"Reset" command gives the same with the 250 and 500 version :
IMG_7685.JPG
by bprosman
Mon Dec 03, 2018 11:06 pm
Forum: acorn atom and system
Topic: Trying to get a Godil powered Atom alive
Replies: 6
Views: 426

Trying to get a Godil powered Atom alive

Tonight I tried to get my "Godil powered" Atom alive (with Dave Hoglet's T65) unfortunately it doesnt work (yet). Hope that with help of some people here I can get it alive so that I can use the T65 for a stubborn Junior Computer (Elektor) as well. My starting point is a "bare minimum Atom" which ru...
by bprosman
Sun Dec 02, 2018 3:36 pm
Forum: general
Topic: Today I built ...
Replies: 50
Views: 4491

Re: Today I built ...

(That's assuming your adapter maintains the original GODIL pinout)
Yes it does, took it from the original schematic. Thanks !
by bprosman
Sun Dec 02, 2018 3:00 pm
Forum: general
Topic: Today I built ...
Replies: 50
Views: 4491

Re: Today I built ...

@Hoglet, Kees,

Will test it on my "minimum Atom" later this week. Still need to flash the right image in it, its a 500K Version.

Need to check which one that is on Github <hint> :wink:

Regards, Bram
by bprosman
Sat Dec 01, 2018 6:06 pm
Forum: general
Topic: Today I built ...
Replies: 50
Views: 4491

Re: Today I built ...

Today I built a Godil adapter. Having a "stubborn" 6502 and a Z80 machine "under construction" I was heavily interested in Dave/Hoglet's ICE-Txx. Unfortunately the original Godil is not available anymore but the 2x50IDC connector version is : https://shop.trenz-electronic.de/en/TE0262-00B-GODIL50-XC...
by bprosman
Sat Nov 24, 2018 6:12 pm
Forum: general
Topic: Today I built ...
Replies: 50
Views: 4491

Re: Today I built ...

Very interested in your posts about it Dave and see it working.
by bprosman
Wed Nov 21, 2018 1:18 pm
Forum: other vintage computer hardware, software and games
Topic: What brand/type of FPGA
Replies: 11
Views: 660

Re: What brand/type of FPGA

@BigEd, The programming tools for Xilinx and Altera I already have. I am already using it for CPLD's where I have some experience with. @All, If I would go this route : but you might be better off with say a DE0-Nano or something even smaller and cheaper, and hooking up a 7 segment display as a proj...
by bprosman
Wed Nov 21, 2018 10:40 am
Forum: other vintage computer hardware, software and games
Topic: What brand/type of FPGA
Replies: 11
Views: 660

What brand/type of FPGA

As I would like to become more familiar with FPGA’s (I see Dave "Hoglet" doing magic with these on multiple projects) and learn im looking into a small development board with FPGA, some Sdram, displays ( can be 7 segment) a bunch of buttons and leds, what FPGA ( family ) would be ok to choose ? This...
by bprosman
Sat Nov 17, 2018 3:19 pm
Forum: development tools
Topic: 6502 Assembler
Replies: 4
Views: 624

Re: 6502 Assembler

Always liked TASM (as in Telemark assembler, not Turbo assembler) it does multiple processors :
https://github.com/feilipu/NASCOM_BASIC ... ter/TASM31

http://www.s100computers.com/Software%2 ... Manual.pdf
by bprosman
Wed Nov 14, 2018 8:29 pm
Forum: hardware
Topic: Logic Levels for 5V TTL Systems
Replies: 11
Views: 1065

Re: Logic Levels for 5V TTL Systems

Any longer than that and the system starts glitching quite badly.
Maybe a little off topic but i'm struggling with a XC9572XL driven by a DIL oscillator but after some time the CPLD freezes.
The oscillator is powered with 5V, the CPLD with 3V3.
by bprosman
Wed Nov 14, 2018 3:55 pm
Forum: hardware
Topic: Logic Levels for 5V TTL Systems
Replies: 11
Views: 1065

Re: Logic Levels for 5V TTL Systems

Always found this a quick and easy design for a level shifter :
https://learn.sparkfun.com/tutorials/bi ... -guide/all

Based on NXP's appnote :
https://www.nxp.com/docs/en/application ... N10441.pdf
by bprosman
Fri Nov 02, 2018 11:29 am
Forum: acorn atom and system
Topic: Acorn Atom weird video idea
Replies: 9
Views: 553

Re: Acorn Atom weird video idea

@Dave, The RC2014 version I was referring to (with the GitHub link) is a video board that accepts serial commands (Escape codes) to execute video commands. Your version as far as I understand uses a "Tube interface". Maybe there is something "in the middle" that can communicate via a FIFO kind of re...
by bprosman
Fri Nov 02, 2018 10:37 am
Forum: acorn atom and system
Topic: Acorn Atom weird video idea
Replies: 9
Views: 553

Re: Acorn Atom weird video idea

Was also looking for a more universal version like : https://github.com/fbergama/pigfx/commit/5d74c9b0b3bfa85bd8e2e9b3620800c8d04c57c2 This to (also) use in other projects as well. Can Dave's version be modified that you have maybe not a serial version but a universal FIFO register to handle command...
by bprosman
Fri Nov 02, 2018 9:41 am
Forum: acorn atom and system
Topic: Acorn Atom weird video idea
Replies: 9
Views: 553

Re: Acorn Atom weird video idea

Roland's been experimenting with exactly this using a Pi Zero connected via the Atom Tube interface.
Like my son I hate it when someone else already had one of my bright ideas :mrgreen: :mrgreen: :mrgreen:
by bprosman
Fri Nov 02, 2018 7:35 am
Forum: acorn atom and system
Topic: Acorn Atom weird video idea
Replies: 9
Views: 553

Acorn Atom weird video idea

In this forum I see a couple of designs for an Atom color board varying from the original Acorn color board up to an FPGA (board) , a Raspberry Pi 0 with CPLD or a Godil. Why not “outsourcing” the video part complete to for example a Pi 0 like here : https://github.com/fbergama/pigfx/tree/afcfc39647...
by bprosman
Wed Oct 31, 2018 1:09 pm
Forum: acorn atom and system
Topic: Restoring an Acorn Atom
Replies: 18
Views: 858

Re: Restoring an Acorn Atom

:oops: :oops: :oops: :oops: :oops: Youre right Dave !!! That did it.
Even the Mini-Me version.
IMG_7498.JPG
IMG_7497.JPG
by bprosman
Wed Oct 31, 2018 12:53 pm
Forum: acorn atom and system
Topic: Restoring an Acorn Atom
Replies: 18
Views: 858

Re: Restoring an Acorn Atom

Fixed, intially replaced the transistors with BC547B's , not the 100% replacement but the ghosting stayed. Built a seperate amplifier that didnt show the issue. In the end bypassing the 1mH choke fixed the issue. Years ago I can recall replacing this one by just a wire bridge on another board as it ...
by bprosman
Tue Oct 30, 2018 9:24 pm
Forum: acorn atom and system
Topic: Restoring an Acorn Atom
Replies: 18
Views: 858

Re: Restoring an Acorn Atom

Elektrolytic capacitors are Vishay from a reliable source.
Did the Atom video work before the rebuild?
Is it the same 6847?
Hm... yes it did work but cant recall the picture. Having some doubts about the Video->VGA converter.
by bprosman
Tue Oct 30, 2018 8:55 pm
Forum: acorn atom and system
Topic: Restoring an Acorn Atom
Replies: 18
Views: 858

Re: Restoring an Acorn Atom

Did some more testing : -C2 fitted or not doesnt make a difference. -It's not the little switchers, same issue with a lineair powersupply. - Transistors are the original ones,BC239. - Resistors are new as well as the capacitors , values double checked. Tomorrow I will make a different socket to not ...
by bprosman
Tue Oct 30, 2018 7:24 pm
Forum: acorn atom and system
Topic: Restoring an Acorn Atom
Replies: 18
Views: 858

Re: Restoring an Acorn Atom

Aaaand.... we have a liftoff :D
Minimum setup. Unfortunately a lot of ghosting in the video signal.
Replaced the 7805's with little switchers, hope that doesnt influence the video signal too much.

What is the correct (default) for Link 4 and 5?
IMG_7485.JPG
IMG_7482.JPG
IMG_7486.JPG