LINKR@VTVM1.CC.VT.EDU (Roger Link) (07/03/90)
I have just purchased a used Yamaha DSP-1 digital signal
processor. The unit seems to work well. The startup message is
"YAMAHA V1.0 DSP 8607", indicating V1.0 of firmware. Has anyone
seen a later firmware release? I dumped the firmware (the unit
uses a Hitachi HD6303RP processor to control the 24-bit audio
DSP's. The firmware is stored in a NEC 27C256-20 EPROM) ). It
appears to have some MIDI messages in the ROM. Any ideas on why
the MIDI stuff?? Has anyone else hacked on the DSP-1??? The CPU
board has a Hitachi HD63A50P ACIA chip which appears to a serial
link to the three Yamaha DSP's. Each DSP has six NEC D4464C-15L
DRAMs, which are organized as 16Kx4. There is a switch labelled
SW501 "TEST", located on the right front corner (when the DSP-1
is viewed from the front) on the CPU board. If this switch is
depressed when the unit is powered up, the diagnostic routines
are executed. The diagnostic routines are controlled by the
remote. Any one know how to control the routines???
I also have a new Adcom CD player (GCD-575). Does anyone have
information on the coding technique used on the coaxial digital
output (A single RCA output)?? Do fiber & coaxial use the same
coding technique????
Roger Link
LINKR@VTVM1
Physics Electronics Shop
Room 1 Robeson Hall
Blacksburg Va 24061