Grundy Newbrain Hardware Emulation (PART 2) 

PART 2
I managed to translate the 1.8v of the Tang nano 9k to 5volts so i can implement several devices.
This is a Grundy Newbrain Hardware Emulation.
The CPU is running at 10Mhz,
The system has a total of 96Kb RAM newbrain uses 32KB as Ram and another 32KB as ROM (Non writable RAM to be exact).
The Tang Nano 9k FPGA implements the logic of the system and the MMU.
The Tang Nano is wired to the dual port 64Kb RAM and implements the VGA signal and character generation.
CH376S module is used as a storage device with parallel interface.
LCD 16x2 using i2c and
PS/2 interface (Keyboard) (ps/2 or usb socket).
github.com/cde... (Z80 ROM & FPGA VHDL)
github.com/cde... (Hardware PCB Cards)
newbrainemu.eu... (Modular Design)
newbrainemu.eu (Newbrain Software Emulation)