[CDesp]

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IC450 pin 4 nFRM

IC461 pin 1 nRSTFRM

IC463 pin 3 t141 to FP

IC471 pin 12 FP

SB_IC418 pin3 nTVRQP

 

SB_IC419 pin3 TVAD

SB_IC419 pin6 nCPQRG

SB_IC420 pin11 TVCLK

SB_IC422 pin6 TVSD

SB_IC423 pin3 nBUSRQ

• This reply was modified 1 year, 12 months ago by CDesp.

[CDesp]

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I finally fixed it. It was the FRM signal it didn’t propagate from IC 451 Pin 4 to IC 419 on Storage Board Pin 5. I thought that since the graphics worked it should be an IC that has the ~GR signal in the inputs and that one is the 419 on Storage Board, it is an AND with ~GR and FRM as inputs so from there it was easy to trace the problem.

I traced it from Pin5 right under the cop420 ic419 on MB but then i couldn’t see where the problem was so i soldered a small jumper cable between IC451 Pin 4 and the via under the Cop and filckering went away.

[CDesp]

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The simplest way to transfer files from the PC to the real Newbrain is through serial rs232.

Then you can send the files from the NB Emulator, using device 9 (serial rs232), Use poke 19,9 to have this as your primary storage device.

Load a program to the emulator. then type load to the real newbrain and save to the emulator (on that order) and it should load the program from the emulator.

If you want to have the programs on tapes you can then save the files to a tape from the real newbrain. (poke 19,1 to restore tape storage)

More on serial cable see here https://newbrainemu.eu/download/newbrain-serial-cable/

[Author]

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