E0 - IBM ROM BASIC - used while in interpreter
 E0 - APL*PLUS/PC - RESTIME HIGH-RESOLUTION TIMER FOR QUAD MF FUNCTION
 E0 - VIRUS - "Micro-128" - ???
 E0 - CP/M-86, Concurrent CP/M, DR Multiuser DOS - FUNCTION CALLS
 E0 - DR Multiuser DOS - "A_READ" - READ CHARACTER FROM AUX DEVICE
 E0 - DR Multiuser DOS - "A_WRITE" - WRITE CHARACTER TO AUX DEVICE
 E0 - DR Multiuser DOS - "A_STATIN" - GET INPUT STATUS OF AUX DEVICE
 E0 - DR Multiuser DOS - "A_STATOUT" - GET OUTPUT STATUS OF AUX DEVICE
 E0 - ConcCP/M,DR Multiuser DOS - "S_MEMORY" - RESERVE MEMORY IN GLOBAL AREA
 E0 - ConcCP/M,DR Multiuser DOS - "Q_MAKE" - CREATE MESSAGE QUEUE
 E0 - ConcCP/M,DR Multiuser DOS - "Q_OPEN" - OPEN MESSAGE QUEUE
 E0 - ConcCP/M,DR Multiuser DOS - "Q_READ" - READ MESSAGE QUEUE
 E0 - ConcCP/M,DR Multiuser DOS - "Q_CREAD" - CONDITIONALLY READ MSG QUEUE
 E0 - ConcCP/M,DR Multiuser DOS - "Q_WRITE" - WRITE MESSAGE QUEUE
 E0 - ConcCP/M,DR Multiuser DOS - "Q_CWRITE" - CONDITIONALLY WRITE MSG QUEUE
 E0 - ConcCP/M,DR Multiuser DOS - "P_DISPATCH" - CALL DISPATCHER
 E0 - ConcCP/M,DR Multiuser DOS - "P_PRIORITY" - SET PROCESS PRIORITY
 E0 - ConcCP/M,DR Multiuser DOS - "C_DETACH" - DETACH FROM DEFAULT CONSOLE
 E0 - DR Multiuser DOS - "A_ATTACH" - ATTACH AUX DEVICE
 E0 - DR Multiuser DOS - "A_DETACH" - DETACH FROM AUX DEVICE
 E0 - DR Multiuser DOS - "A_CATTACH" - CONDITIONALLY ATTACH TO AUX DEVICE
 E0 - DR Multiuser DOS - "A_SET" - SET DEFAULT AUX DEVICE NUMBER
 E0 - DR Multiuser DOS - "A_GET" - GET DEFAULT AUX DEVICE NUMBER
 E0 - DR Multiuser DOS - "A_READBLK" - READ STRING FROM AUX DEVICE
 E0 - DR Multiuser DOS - "A_WRITEBLK" - WRITE STRING TO AUX DEVICE
 E0 - DR Multiuser DOS - "A_CONFIG" - GET/SET AUX DEVICE PARAMETERS
 E0 - DR Multiuser DOS - "A_CONTROL" - GET/SET AUX CONTROL PARAMETERS
 E0 - DR Multiuser DOS - "A_BREAK" - SEND BREAK TO AUX DEVICE
 E0 - DR Multiuser DOS - "P_DELAY" - DELAY EXECUTION