BrettHallen/Radix_FW60

Source: https://github.com/BrettHallen/Radix_FW60

IBS/Radix FW60

Information about the “Immediate Business Systems” (IBS) and “Radix Micro Devices” FW60 (Field Worker?) very-ruggedised, handheld CP/M computer.

Operating System

A dump of the ROM hints that it’s running Personal CP/M-80.

BDOS function 12 returns the version byte. This one loads 28h:

EE05:  3E 28        LD   A,28h      ; version 2.8
EE07:  C3 4C E3     JP   0E34Ch     ; store as BDOS return value

Main Chips

• Hitachi HD64180 CPU
• Hitachi HG61H15 series ASIC (© IBS plc)
• NEC D7506G 4-bit microcontroller (for keyboard?)
• 32KB EPROM with Personal CP/M-80 (CP/M 2.2 compatible) plus application software
• Hitachi HD44101 and HD44105 for LCD
• Samsung KM681000BLGI 1Mb/128KB SRAM

The HD64180 (PDF) is an embedded version of the Z80 with MMU. It was licensed back to Zilog as the Z61480 which then became the Z180.

The FW60 I have has nine 1Mb SRAM chips - eight for the 1MB RAM disk and one for the 128KB system RAM. The machine also had a 128KB RAM disk option.

Power

The machine has a three-cell (Sanyo N-600AA) NiCd battery pack (Radix part no. 260525-070-01) rated for 3.6V and 600mAh.

It has a further three batteries installed internally:

• a Saft LS14500 3.6V non-rechargeable lithium-thionyl chloride (Li-SOCl₂) battery for retaining the RAM contents over a period of years
• two Sanyo ML2016 3V rechargeable lithium-manganese dioxide (Li-MnO₂) cells on the processor board

ROMs

So far I have dumped the ROM from the Greek-sourced machine I have.

YouTube Videos

• Part 1: Power on & initial disassembly
• Part 2: Disassembly completed