Colin MK I

Specifications
The table below shows the specifications of Colin MKI, representing the state of play for most of his life.

 Processor  Z80A - 4Mhz
 Memory  64kB Static RAM
 Firmware  BOS V2.3 - (2k EPROM)*
 Operating system  CP/M 2.2
 Video display  Memory mapped colour Teletext display
   - 40 chars x 24 lines
   - UHF output (PAL), Composite video & TTL RGB + Sync
 Keyboard  7 Bit parallel ASCII
   - Carter Professional Model 756
 Floppy Disk storage  Dual 8" Floppy drives. SSSD
   - 77 track (Shugart 801)
 Single 5 1/4" Floppy drive. DSDD
   - 40 track (Micro Peripherals)
 Cassette storage  Dual cassette interface - Max 2400 baud (CUTS)
 Printer output  RS232 & 20mA interfaces
 Serial interfaces  Dual channel RS232 ports with full handshaking
 Audio interfaces  Dual sound processors - (AY-3-8910)
 Speech synthesis processor - (SPO256-AL2)

* In the early stages, the firmware was called 'CSYS/80'. According to the Custom 80 manual, it should be pronounced 'sea-siss'. This was the original firmware that was supplied with the keyboard interface card. It consisted of two parts; CSYS/80, which was the operating system for the computer that provided all the basic input / output functions taking up 1.5k of the EPROM, and INSECT, which was a debug / execution program that lived in the remining 0.5k. As supplied, my original firmware was serial number 1303. (CSYS/80 V1.05. INSECT V0.09)

Once I got into improving and extending the basic system as described in earlier pages, I modified the firmware and renamed it BOS. (Basic Operating System).

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