Specifications

Processor Description (V40)

RESET

Resetting the V40 initializes registers internal to the CPU, VCR,

SCU, TCU, ICU, and DCU. The reset states for the CPU registers are

given in Table 5-3. Reset states for registers internal to the VCR,

TCU, ICU, DCU, and SCU are given in their respective chapters.

The reset states of the program segment and instruction pointer

combine to produce a physical address of FFFF0h. This is the address

from which the V40 fetches the first instruction after reset.

Table 5-3

CPU Reset State.

PFP [IP] 0000h

PC 0000h

PS [CS] FFFFh

SS [SS] 0000h

DS0 [DS] 0000h

DS1 [ES] 0000h

PSW [FL] F002h

AW [AX], BW [BX] Undefined

CW [CX], DW [DX] Undefined

IX [SI], IY [DI] Undefined

BP [BP], SP [SP] Undefined

Instruction Queue Cleared

5-23