Support/peripheral/other chips starting from 77

UPD7720A	Digital signal processor
Comment:	On-chip memory: program ROM (512 x 23 bits), data ROM (510 x 13 bits) and data RAM (128 x 16 bits). Two serial and one 8-bit parallel port.
Package:	28-pin DIP
Manufacturers:	NEC
NEC	UPD7720AC, UPD7720AD, D7720AC, D7720AD
UPD77C20	CMOS digital signal processor
Comment:	On-chip memory: program ROM (512 x 23 bits), data ROM (510 x 13 bits) and data RAM (128 x 16 bits). Two serial and one 8-bit parallel port. Pin compatible with UPD7720.
Packages:	28-pin DIP, 44-pin PLCC
Manufacturers:	NEC
NEC	UPD77C20D, UPD77C20L, D77C20D, D77C20L
UPD77P20	Digital signal processor
Comment:	EPROM version of UPD7720A. On-chip memory: program ROM (512 x 23 bits), data ROM (510 x 13 bits) and data RAM (128 x 16 bits). Two serial and one 8-bit parallel port.
Package:	28-pin DIP
Manufacturers:	NEC
NEC	UPD77P20D, D77P20D
UPD7730	ADPCM speech encoder/decoder
Comment:	Encodes PCM data into ADPCM data, and decodes ADPCM data back to PCM data. Encodes/decodes speech at 32 Kbps.
Package:	28-pin DIP
Manufacturers:	NEC
NEC	UPD7730C, D7730C
UPD7755	ADPCM speech synthesizer
Comment:	D/A converter with 9-bit resolution. 96 Kb built-in speech data ROM allows synthesis of messages up to 12 seconds.
Package:	18-pin DIP
Manufacturers:	NEC
NEC	UPD7755C, D7755C
UPD7756	ADPCM speech synthesizer
Comment:	D/A converter with 9-bit resolution. 256 Kb built-in speech data ROM allows synthesis of messages up to 30 seconds.
Package:	18-pin DIP
Manufacturers:	NEC
NEC	UPD7756C, D7756C
UPD7759	ADPCM speech synthesizer
Comment:	D/A converter with 9-bit resolution. Can address up to 1 Mb of external data ROM. Can be used for emulating UPD7755 and UPD7756.
Package:	40-pin DIP
Manufacturers:	NEC
NEC	UPD7759C, D7759C
UPD77230	Advanced signal processor
Comment:	Implements 32-bit floating-point arithmetic. On-chip memory: 2Kb x 16 program ROM, 1 Kb x 16 data ROM and 1 Kb x 16 data RAM.
Package:	68-pin PGA
Manufacturers:	NEC
NEC	UPD77230R, D77230R