![[Really bad picture of Dennis Severin's Z80 System]](./img/z80.jpg)
| MANUFACTURER | Dennis Severin |
| MODEL | Z80 System |
| YEAR OF INTRODUCTION | 1987 |
| MAIN PROCESSOR | Z80A |
| BITS | 8 |
| CLOCK SPEED | 2.5 MHz |
| FLOATING POINT UNIT | none |
| MEMORY MANAGEMENT UNIT | none |
| CO-PROCESSOR | none |
| RAM | 8k |
| ROM | 8k |
| OPERATING SYSTEM | GTC Z80 Monitor |
| HONOURABLE MENTION | Dennis Severin |
This'll make you chuckle. Dennis, once again, gave me a development system he had designed many years ago. Unfortunately there was no ROM. Being the rather meticulous and organised fellow that Dennis is, he had the source code for a monitor program called "Z-Bug" archived on a disk somewhere. Within weeks, he had located it and gave me a copy so I promptly copied it to the hard drive on my PC. Being the absent-minded and disorganised tool that I am, I forgot to back it up on another disk before formatting the hard drive for an OS upgrade. BUGGER!
Fortunately, many years later, I got contacted by a couple of fellas that attended Gordon Tafe in Geelong, Victoria. They used the exact same board and had built one for themselves while there and provided me with ROM dumps. The files were over 2k so I burnt the ROM to a 27C64, moved the jumper from the 2k to the 8k position, and replaced the 6116 static RAM chip with a 6264. I hooked its serial port to my laptop running a terminal emulator and cycled through various baud rates until I got something. At 1200 baud I was greeted with "GTC.Z80 monitor" and was extremely pleased. After having it for over 20-something years, it finally ran!