Frontpage News SBC Computer

Atlas Z80 Computer Emulator – Development

12 June 2026
CDesp
oplus_262144

This is an update on the development of the z80 computer emulator.

Info: https://newbrainemu.eu/2025/12/14/atlas-z80-computer-emulator/

Github: https://github.com/cdesp/Z80_SBC

12/6/2026

You can see some jumper cables because the 16 bit voltage translators 74LVC16245 work with reversed the directional pins compared to the 74LVC4245(8 bit ones) and i didn’t RTFM so i had to reverse 3 pins to make it work as expected.

So far i manage to have

  • the serial RS232 working via a USB-C connection to my PC at 115200bps.
  • The 1MB SRAM
  • The FPGA has 8KB internal RAM that i currently use to load z80 code to boot.

13/6/2026

  • The Flash Ram works i got the id 0xBF,0xDF (SST39LF040)
oplus_0
  • Video signal works from HDMI output. I am using an HDMI to VGA converter.

22/6/2026

oplus_262144

Fixing the databus enable signal for the databus voltage converter. I had to use a 74hct32 ic to include the 3 devices that are accessed by the z80 directly (ch376s, AY38912 and SN76489).

I am currently working on the usb storage device (CH376s) so i can read files from there.

24/6/2026

Developing is going great. Storage device is working and the Video signal is ok for the default screen 320x200x4 of the bootloader.

oplus_262144

Leave a Reply