;**************************************************************************
;*               CP/M 3 BIOS for Z80em86 Z80 CPU emulator                 *
;*                                                                        *
;*                  DPH unit byte definition for CP/M 3                   *
;*                                                                        *
;*                  Copyright (C) 1992-2009 Stewart Kay                   *
;**************************************************************************
;
; ChangeLog (most recent entries are at top)
; ------------------------------------------
; v1.0.0 - 16 February 2009, S.J.Kay
; - Prepare for public release.
;
; v1.00 - 17 April 1995, S.J.Kay
; - Undocumented changes.
;
; v0.00 - 1992, S.J.Kay
; - Initial creation date.

; DPH UNIT (@RDRV) byte mode bits

; bit 7, 6 - cylinder format
uddsk	equ	00000000b	;double sided up-down disk
dsdsk	equ	01000000b	;double sided disk
ssdsk	equ	10000000b	;single sided disk

; bit 5, 4 - disk density
sden	equ	00000000b	;single density
dden	equ	00010000b	;double density
hden	equ	00100000b	;high density

; bit 3, 2 - drive type
flp	equ	00000000b	;floppy type
hdd	equ	00000100b	;HDD drive type
ram	equ	00001000b	;RAM drive type

; bit 1, 0 - drive select
drv0	equ	00000000b	;drive select code 0
drv1	equ	00000001b	;drive select code 1
drv2	equ	00000010b	;drive select code 2
drv3	equ	00000011b	;drive select code 3

; end of file