Scamp Registers; Ems Index Register And Data - Mitsubishi Electric LS Pro Hardware Technical Reference

Memory and I/O Usage

SCAMP registers

This section identifies the ports used by, and the ports indexed in, the VL82C311. A
full description of the ports is given in the manufacturers data sheet.
The SCAMP chipset uses a number of ports in the E8 to FFh range. The ports used are
identified in the table below:
Note
Ports which are not specifically mentioned in the table are not used by the chipset.
EMS index The SCAMP chipset provides a LIM 4.0 compliant EMS system. The EMS index register
register and is used to access 36 mapping registers through the two data ports. For further
data ports information on EMS refer to the LIM 4.0 specification.
The SCAMP EMS system is configured using the EMS configuration registers.
5/10 LS PRO HARDWARE TECHNICAL REFERENCE
Port Title
E8 EMS index register
E9 reserved
EA EMS data port low byte
EB EMS data port high byte
EC Configuration index register
ED Configuration data register
EE Fast A20
EF Fast reset
F0 Coprocessor busy clear
F1 Coprocessor reset
F4 Slow CPU
F5 Fast CPU
F8 Coprocessor
F9 Configuration disable
FA Coprocessor
FB Configuration enable
FC Coprocessor
FE Coprocessor