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#1 29-04-2020 16:02:27
- centrespot
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Newbrain PCB layout schematics
Hi
Would anyone know where to get a copy layout of the rom/ram pcb
#2 01-05-2020 17:58:02
- admin
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Re: Newbrain PCB layout schematics
From Saphir17:
Hello Centrespot
There are none.
The NB was designed 1980-1981 and in those days the layout was most likely done on paper and film.
I have knowledge of one person that have drawn the entire NB and Expansion in Eagle, true to original design, but its not for public use.
You say ROM/RAM board. There is only a RAM board. The ROM's are on the main board.
If you or someone have the eager to take on the task, here are some design hints/requests :
- Use KiCAD 5.x. Eagle is becoming old quickly.
- The RAM Board : route for +5V RAM, not the old +-5V,12V (or even one static RAM. Needs some design changes thou)
- Do 4-layer for use of GND and VCC planes.
- Use SMD where possible.
- Use HCT/HC logic where possible.
Well.. just some thoughts.
#3 18-06-2020 16:03:48
- flypie
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Re: Newbrain PCB layout schematics
Hi,
I just started creating the schematics in KiCAD the problem is that the originals scans are inconsistent with themselves and reality. One of the things I'm looking for to help me is some detailed photographs of the mainboards where any print can be read. The more information the better.
https://github.com/flypie/NewBrain
#4 21-06-2020 16:47:30
- kluder
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Re: Newbrain PCB layout schematics
Hi
It's been many years since I've made NewBrain schematich in Eagle.
I now transferring them to Kicad.
this PDF document shows NB Main schematich and PCB in Eagle and Kicad respectively.
https://newbrainemu.eu/components/com_a … -Board.pdf
Of other NB schematich I have made are the following.
Battery Module (NB12125 iss2)
Battery Module (NB12126 rev.3)
NB Disc Controller (NB 12145 rev.3)
NB Disc Controller (NB 12145 rev.6) - (Not ready)
Expansion Card
Expansion Card (KD10013)
Expansion Card (KD10016) PiBox
Expansion Card (KD10017)
Expansion Card (NB12134)
Expansion Card (NB12138)
Expansion IO Interface (Data Center Denmark)
Expansion Main Board (NB 12140 rev.5)
Expansion Sub Board (NB 12141 rev.3)
Expansion Sub Board (NB 12141 rev.6)
Expansion Sub Board (NB 12143 rev.1) -LP
128K ADD Board
Key Board ADD (NB 12139 rev.1)
Key Board A (NB 12127 rev.3)
Key Board Model A (NB 12127 rev.?) A rev.3 PCB which I have changed for new keys
Key Board AD (NB 12125 rev.3)
NB Main Board (NB 12117 rev.7)
NB Main Board (NB 12117_x_7 +) here i have made connections to a reset button
NB Main Board DK (NB 121xx rev.) A Danish main board
NB Store Board (NB 12118 rev.)
NB Store Board (NB 12118 rev.10)
Disk Unit (8514_MB_10021) Power Supply in Disk Unit
Power Supply (000553)
Power Supply (NB 1100x)
Regards
Klaus
Last edited by kluder (22-06-2020 01:56:55)
use google to translate
#5 18-03-2021 01:21:33
- kluder
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Re: Newbrain PCB layout schematics
Hi
I have now changed pretty much all the Eagle CAD files to Kicad files.
I have also made a new Main Board equipped with SMD circuit, however, there are some that can not be replaced so it is still the old DIP.
Power section has been changed to only + 5V, the new power part can be fed with voltage from 5V to 12V without damage anything.
This Main board also requires a new RAM board as the logic circuits that sat on the RAM board are moving down on the Main Board, and it is also prepared for 128 Kb ram with jumper. 
This image has been resized, click here to view the full-sized image.
The new Store Board made by Michael can be seen here
This image has been resized, click here to view the full-sized image.
Greetings
Klaus
Last edited by kluder (05-04-2021 08:05:16)
use google to translate