;===================================================================
;	RAM-Disk routines by W. W. COX 8/18/87 (symbol definitions)
;
; The following values are either..
;	(S)	determined by software..
;	(H)	determined by hardware..
;	(A)	arbitrarily chosen by system integrator

BNKPRDSK EQU	15		; (H) Memory banks per Ram Disk

RDBSH	 EQU	4		; (A) Block Shift Factor (4=2k Blocks)

BLKPRDIR EQU	2		; (A) Allocation Blocks per Directory
RDOFF	 EQU	2		; (A) Offset past Boot Tracks

KBPERBNK EQU	64		; (H) 64K Bytes per memory bank
BYTPRSEG EQU	1000H		; (H) Bytes per Memory Segment

BYTPRDIR EQU	32		; (S) Bytes per Directory Entry
BYTPRSEC EQU	128		; (S) CP/M Sector size

;RDBLM	 EQU	(1.SHL.RDBSH)-1	; Block Mask
RDBLM	 EQU	(1 SHL RDBSH)-1	; Block Mask

;KBPERBLK EQU	1.SHL.(RDBSH-3)	; Alloc. Block size in K-bytes
KBPERBLK EQU	1 SHL (RDBSH-3)	; Alloc. Block size in K-bytes

BYTPRBLK EQU	KBPERBLK*1024	; 1K Bytes per CP/M Allocation Block
BYTPRTRK EQU	BYTPRSEG	; One memory segment per track
SECPRTRK EQU	BYTPRTRK/BYTPRSEC	; CP/M Sectors per Track
KBPERTRK EQU	BYTPRTRK/1024		; K-Bytes per Track
BLKPRTRK EQU	BYTPRTRK/BYTPRBLK	; CP/M Allocation Blocks per Track
BLKPRDSK EQU	(KBPERBNK/KBPERBLK)*BNKPRDSK ; Allocation Blocks per Disk
DIRPRTRK EQU	BYTPRTRK/BYTPRDIR	; Directory Entries per Track
DIRPRBLK EQU	BYTPRBLK/BYTPRDIR	; Directory Entries per Alloc. Block
TRKPRBNK EQU	KBPERBNK/KBPERTRK	; Tracks per Bank
TRKPRDSK EQU	TRKPRBNK*BNKPRDSK 	; Tracks per Disk

RDDSM	 EQU	(BLKPRDSK-(BLKPRTRK*RDOFF))-1

;	IFTRUE	RDDSM.LT.256
	IF	RDDSM LT 256
BLKPRFCB EQU	16		; Number of blocks addressable per Dir. entry
	ELSE
BLKPRFCB EQU	8		; Number of blocks addressable per Dir. entry
	ENDIF

RDEXM	 EQU	((KBPERBLK*BLKPRFCB)/16)-1	; Extent mask

;RDALLOC	 EQU	0FFFFH.SHL.(16-BLKPRDIR)
RDALLOC	 EQU	0FFFFH SHL (16-BLKPRDIR)

RDAL0	 EQU	RDALLOC/100H

;RDAL1	 EQU	RDALLOC.MOD.100H
RDAL1	 EQU	RDALLOC MOD 100H

RDKSIZE	 EQU	(RDDSM+1)*KBPERBLK	;KBPERBNK*BNKPRDSK

RDDRM	 EQU	(DIRPRBLK*BLKPRDIR)-1	; Directory Entries per Directory

; Place RAM-Disk buffer in Segment immediately below BIOS

RDSEG	 EQU	(CBIOS/BYTPRSEG)-1	; Round down to next 1000H boundary

RDBUFF	 EQU	RDSEG*BYTPRSEG

ACTULMAP EQU	600H		; Morrow Voodoo Gizmo..
IMAGEMAP EQU	200H		;  ..memory map tables

CPMBANK	 EQU	0		; CP/M Bank is Bank 0
CPMTASK	 EQU	1		; CP/M Task is Task 1

;===================================================================
;
RDREAD	 EQU	0		;READ DATA
RDWRITE  EQU	0FFH		;WRITE DATA
;

;	END	; End of D1RDSYM.LIB