The Newbrain Forum

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.

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 03:56:55)

Hi Chaps,

I'm new here, I had a newbrain in about 83, and have today once again got one, it has a fault with white screen and garbled VFD characters.

! Whilst diging for schematics, found the following; https://pjmarsh.co.uk/newbrain.pdf not sure of the original source but it has both the main board schematic plus the PCB track layout.

regards,

Paul
twitter @UHF_Satcom