One of the advantages of lockdown is that spare time is often in plentiful supply. I noted a few months ago that BBC Basic for Z80 by R.T.Russell is now open source, and available under a zlib license. Inspired by the work of David Given who has included it to his CPMish project, I decided to have a crack at porting it to my BSX Breadboard Computer. I had to fettle the source files slightly …
I left the project in the previous post with a ROM on-board, but still running NOPs – it was running an EEPROM filled with zeros. The next step is to find a way to run programs and see the output. In order to do that I will need to do a few things: Add an STM32 ‘Blue Pill’ microcontroller to handle I/O Add an LCD display module to output debug information from the STM32 Add …
I left the project in the previous post running as a Z80 NOP test circuit; a minimal circuit for running a Z80 with no memory or I/O. The next step is to start fleshing out the board by adding an EEPROM. Bill of Materials In addition to the parts used in Part 1: 1 x 27C512 EEPROM (I used a Winbond W27C512-45 part) 1 x Minipro TL866II Eprom programmer (available from Amazon for around £40) …
