FIFO_DATA equ BUTCH+$24 ; i2s FIFO data
I2SDAT1 equ BUTCH+$24 ; i2s FIFO data
I2SDAT2 equ BUTCH+$28 ; i2s FIFO data
-2C = ?
+ equ BUTCH+$2C ; CD EEPROM interface
;
; Butch's hardware registers
Commands send through serial bus:
-$100 - ? Acknowledge ?
-$130 - ? (Seems to always prefix the $14n commands)
-$140 - Returns ACK (1) (Write to NVRAM?)
+$100 - ? Acknowledge ? (Erase/Write disable)
+$130 - ? (Seems to always prefix the $14n commands) (Erase/Write enable)
+$140 - Returns ACK (1) (Write to NVRAM?) (Write selected register)
$141 - Returns ACK (1)
$142 - Returns ACK (1)
$143 - Returns ACK (1)
$144 - Returns ACK (1)
$145 - Returns ACK (1)
-$180 - Returns 16-bit value (NVRAM?)
+$180 - Returns 16-bit value (NVRAM?) (read from EEPROM)
$181 - Returns 16-bit value
$182 - Returns 16-bit value
$183 - Returns 16-bit value
$184 - Returns 16-bit value
$185 - Returns 16-bit value
+
+; The BUTCH interface for the CD-ROM module is a long-word register,
+; where only the least signifigant 4 bits are used
+;
+eeprom equ $DFFF2c ;interface to CD-eeprom
+;
+; bit3 - busy if 0 after write cmd, or Data In after read cmd
+; bit2 - Data Out
+; bit1 - clock
+; bit0 - Chip Select (CS)
+;
+;
+; Commands specific to the National Semiconductor NM93C14
+;
+;
+; 9-bit commands..
+; 876543210
+eREAD equ %110000000 ;read from EEPROM
+eEWEN equ %100110000 ;Erase/write Enable
+eERASE equ %111000000 ;Erase selected register
+eWRITE equ %101000000 ;Write selected register
+eERAL equ %100100000 ;Erase all registers
+eWRAL equ %100010000 ;Writes all registers
+eEWDS equ %100000000 ;Erase/Write disable (default)
+
+So... are there $40 words of memory? 128 bytes?
+
*/
// Private function prototypes