The Yaesu FT-736R used the Hitachi HD63A01Y0 microprocessor (Q08) on the radio's control board.
This microprocessor is based on the Motorola 6800 family of processors.http://en.wikipedia.org/wiki/Motorola_6800
HD63A01Y0 : Hitachi Semiconductor, CMOS microcomputer : Hitachi 630x, 1.5 MHz : Masked ROM :
Improved 6800 Microcontroller with on-chip RAM, ROM and peripherals : 16K ROM, 256 RAM
HD63A01Y0 Datasheet IC On-line (China)http://www.ic-on-line.cn/download.php?id=1100215&pdfid=222F732D44D038E12FAF5AC47FCE1F03&file=0052\hd6301y0cp_397300.pdf
IF you can get the ROM image, then it can be masked on a new processor OR
disassembled to reduce the "re-engineering" required for a replacement project.
China IC mart suppliers note that they have stock -- some DIP64, others QFP package..http://www.chinaicmart.com/series-HD6/HD63A01Y0.html
The Motorola 6800 processor family was the basis for many follow-on processors in 1970s and early 1980s.
The original Apple I could run with a 6800 or 6502 processor.
Apple II computer used the 6502, and the Radio Shack Color Computer used 6809 processor.
DASMx - DASMx is a disassembler for a range of common microprocessors, including the Motorola 6800 family and single chip variants (including Hitachi 630X devices).http://myweb.tiscali.co.uk/pclare/DASMx/The disassembler takes as input a binary code/data image file (typically a ROM image) and generates either an assembler source file or a listing file. DASMx is a multi-pass disassembler with automatic symbol generation. DASMx can optionally use a symbol file containing user-defined symbols and specifications of data areas within the source image.
DASMx includes a powerful feature called code threading. Using known code entry points (e.g. reset and interrupt vectors) and by performing partial emulation of the processor, the disassembler is able to follow known code paths within a source binary image.
Use of code threading, together with the multi-pass operation and symbol table management permits readable assembly code output from source images that contain large amounts of data (which tend to confuse most disassemblers).