Fairlight-CMI

Hi Chaps. The chip is probably the Dallas DS1643. Here's some info from the MFX3+ tech manual:

10.2.6.3 FLASH ROMS AND SRAMS

(see 10.4.4 RTC, RAM and FROM schematic)

The SRAM is organised 8k x 32 bits. The top 24 bits are in normal SRAMs (U22,U12,U23). The bottom 8 bits are inside the RTC chip (U14 DS1643). The top 64 bytes are the real time clock values (held in low 8 data bits). As the RTC has an internal battery, the low 8 bits of this SRAM region is non-volatile. For documentation on the Dallas DS1643 RTC see [4].

The Flash ROMs are organised as 512k x 32 bits (U27,U19,U24,U15). Flash ROMs hold the operating system and all diagnostics. For documentation on Flash ROMs see [3].

Hope this is correct, late here in Sydney! Regards, Peter, Horizontal.