In IDA7.2, I can disassemble bridge7757.mot.bin as Processor : h8368 (H8/3687), which give the following disassembly at 0x100:

ROM:0100 ; =============== S U B R O U T I N E =======================================
ROM:0100
ROM:0100
ROM:0100 sub_100:                                ; CODE XREF: ROM:015C↓p
ROM:0100                                         ; ROM:02FA↓p
ROM:0100                 mov.l   #0xFFC000, sp   ; Move data
ROM:0106
ROM:0106 loc_106:                                ; CODE XREF: sub_100+2E↓j
ROM:0106                 mov.l   #0xFFC000, sp   ; Move data
ROM:010C                 jsr     sub_16632:24    ; Jump to subroutine
ROM:0110                 jsr     sub_16652:24    ; Jump to subroutine
ROM:0114                 jsr     sub_59E2:24     ; Jump to subroutine
ROM:0118                 mov.w   r0, r0          ; Move data
ROM:011A                 bne     loc_120:8       ; Branch if not equal
ROM:011C                 jsr     sub_1664E:24    ; Jump to subroutine
ROM:0120
ROM:0120 loc_120:                                ; CODE XREF: sub_100+1A↑j
ROM:0120                 bclr    #0, @byte_C401:16 ; Bit clear
ROM:0126                 mov.w   #0xA501, r0     ; Move data
ROM:012A                 mov.w   r0, @word_D000:16 ; Move data
ROM:012E                 bra     loc_106:8       ; Branch always
ROM:012E ; End of function sub_100

A quick look gives:

0x100 -> 0x306: CODE
0x210C -> 0x1671e seems to be only CODE

Add Renesas H8S to corpus #4

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