readme.md

PROM Dumps

• ND-120 PANEL - ONBOARD PANEL CONTROLLER - MC68705U3
• ND-5000C Panel

ND-120 CPU BOARD - ONBOARD PANEL CONTROLLER - MC68705-U3

The panel controller controls the LCD display in the panel, and handles button presses and sends that to the CPU board.

Schematic

Sheet 40 of the CPU Board has the MC68705 connectins

U3 Block Diaggram

U3 PROM

Binary PROM dump from MC68705-U3 on ND-120 CPU Board

U3 Dissasembly

PROM dump reverse engineered with Ghidra

68705-U3 Dissassembly PDF

U3 C code

Reverse engineered C code (draft) 68705-U3 as C code

The ND-5000C PANEL - MC68705-R3

Panel Controller

The panel uses an MC68705P3 (Which is not the same as the U3 used on the ND-120 CPU board.) The 68705P3 is 28 pins with 3 ports (PORT A,B and C)

Reference NORSK-DATA.COM:

• 323165 - PCB 1844 - Panel Operator including display, ND-5000C
• 324494 - PCB 1834 - Panel Control
• xxxxxx - PCB xxxx - LCDs
• 324147 - PCB 1844 - Telefix/Driver Comson
• CY7C401 - FIFO

R3 PROM

Binary PROM dump from MC68705-R3

R3 Dissasembly

PROM dump reverse engineered with Ghidra

68705-P3 Dissassembly PDF

R3 C code

Reverse engineered C code (draft) 68705-P3 as C code

6805 CPU doc

• MC68705P3, 18 page PDF - MC68705PR 8-BIT EPROM Microcomputer Unit
• 6805P_Oct84, 15 page PDF - MC68(7)05P SERIES 8-BIT MICROCOMPUTERS
• 6805_Users_Manual_2ed_1983, 263 page PDF - M6805 HMOS/M146805 CMOS FAMILY USERS MANUAL
• Motorola DL139, 995 page PDF (U3 from Page 3-684) - Microprocessor, Microcontroller and Peripheral - Volume I