29 lines
463 B
ArmAsm
29 lines
463 B
ArmAsm
|
|
//
|
|
// Official Kernal routine, described in:
|
|
//
|
|
// - [RG64] C64 Programmer's Reference Guide - page 283
|
|
// - [CM64] Compute's Mapping the Commodore 64 - page 227/228
|
|
//
|
|
// CPU registers that has to be preserved (see [RG64]): for RS-232: .X, .Y
|
|
//
|
|
|
|
|
|
getin_real:
|
|
|
|
// Determine the device number
|
|
lda DFLTN
|
|
|
|
// Try $00 - keyboard
|
|
beq_far getin_keyboard
|
|
|
|
#if HAS_RS232
|
|
|
|
// Try $02 - RS-232
|
|
cmp #$02
|
|
beq_far getin_rs232
|
|
|
|
#endif // HAS_RS232
|
|
|
|
jmp chrin_getin
|