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eepromser: Add reference for X2444 commands (nw)

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AJR 2017-11-13 08:15:44 -05:00
parent bf8eac0fbb
commit de4d0deef3
1 changed files with 12 additions and 0 deletions
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src/devices/machine/eepromser.cpp
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@ -90,6 +90,18 @@
93Cxx has ERASE command; this maps to WRITE on ER5911 93Cxx has ERASE command; this maps to WRITE on ER5911
93Cxx has WRITEALL command; no equivalent on ER5911 93Cxx has WRITEALL command; no equivalent on ER5911
The Xicor X2444 NOVRAM (static RAM/EEPROM overlay) has a pin-compatible
serial interface, but its commands follow a rather different format:
Start Address Opcode Command
1 aaaa 011 WRITE data
1 aaaa 11x READ data
1 xxxx 000 WRDS = WRite DiSable
1 xxxx 001 STO = STOre RAM data in EEPROM
1 xxxx 010 SLEEP mode (not in CMOS version)
1 xxxx 100 WREN = WRite ENable
1 xxxx 101 RCL = ReCaLl RAM data from EEPROM
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