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comparison 3rdparty/drivers/burke/hdvars.src @ 91:c10820aa211b

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author boisy
date Wed, 03 Jul 2002 03:41:59 +0000
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1 * COPYRIGHT 1987 BURKE & BURKE
2 * COPYRIGHT 1992 BURKE & BURKE
3 * ALL RIGHTS RESERVED
4 *
5 * Variables for all CoCo XT hard disk drivers.
6 *
7 * Chris Burke Schaumburg, IL
8 *
9 * Modification History
10 * --------------------
11 *
12 * Date Who Description
13 * -------- --- ---------------------------------------
14 * 10/01/87 CJB Added PCCYL variable.
15 * Added unique drive parameters for each drive
16 * 12/20/87 CJB Added park track copied from DD for each drive
17 * 12/23/87 CJB Added level-dependent equates for use w/ 2 drives.
18 * 01/28/88 CJB Added area to preserve active slot 100%
19 * 02/08/88 CJB Eliminated DIVA, DIVY; changed read cache
20 * 04/15/92 CJB Added RETRYEN (should have been there already!?)
21 *
22
23 *
24 * Static Storage
25 *
26 org XDrvBeg ;(level dependent)
27
28 * The controller handles up to 2 drives.
29 * The size of the drive table differs between
30 * level 1 and level 2.
31
32 DRVTBL rmb XDrvMen*Drives
33
34 ifne (Drives-1) ;If 2 drives,
35 ACTDRV rmb 2
36 PRVDRV rmb 1 ;Previous drive #
37 endc
38
39 DRVSEM rmb 1 ;New drive semaphore
40
41 * Register image for disk controller
42 *
43 * SDHREG 00D0HHHH
44 * HICYL MM0SSSSS
45 * LOWCYL LLLLLLLL
46 * SECCNT NNNNNNNN
47 *
48 * D = drive #
49 * H = head #
50 * M = MSB's of cylinder #
51 * S = sector # on cylinder
52 * L = LSB's of cylinder #
53 * N = sector count or interleave
54
55 IMAGE equ .
56
57 SDHREG RMB 1 ;Drive and head number
58 HICYL RMB 1 ;High cylinder # and sector number
59 LOWCYL RMB 1 ;Low cylinder number
60 SECCNT RMB 1 ;Sector count (interleave factor for format)
61 OPTION RMB 1 ;Options / step rate
62
63 ifne cchflg ;If read cache supported,
64
65 * Sector number for pre-read
66
67 OLDLSN rmb 3 ;Old LSN -- this + 1 in buffer if BFRFLG
68 BFRFLG rmb 1 ;$FF = pre-read sector is in verify buffer
69
70 endc
71
72 * Miscellaneous flags
73
74 Temp rmb 2 ;Scratch variable
75 SECNUM rmb 1 ;Used for sector splitting
76 PSECNM rmb 1 ;Previous sector number (used for pre-read feature)
77 OLDSLT rmb 1 ;Old MPAK slot # (to leave it as we found it)
78
79 * Variables for park track location and pre-comp.
80
81 OBSTART equ . ;Base of option variables
82
83 * Drive #0 variables
84
85 PCCYL rmb 1 ;precomp cylinder / 4
86 PRKLSN rmb 3 ;Park LSN -- sector 0, head 0 of park track
87
88 OBSIZE equ (.-OBSTART)
89
90 ifne (Drives-1)
91
92 * Drive #1 variables
93
94 PCCYL1 rmb 1 ;precomp cylinder / 4
95 PRKLSN1 rmb 3
96
97 endc
98
99 * Value of stack pointer, in case we have to recover from an
100 * error. This is used by CMEXEC and it's subroutines.
101
102 AbtStk rmb 2 ;Saved stack pointer
103 RetryEn rmb 1 ;non-zero if hard disk hardware retries are enabled
104 ErrHCyl rmb 2 ;store clyinder number of formatting error here
105
106 * Sector buffer for read caching, write verification,
107 * and pre-reading of adjacent "write" sectors.
108 *
109 * Note that this buffer is shared between both drives, so
110 * the read cache is invalidated by switching drives.
111
112 VRFBUF rmb 256
113 VB.END equ .
114
115 * Reserve some room for the stack
116
117 rmb 128 ;Stack
118
119 endmem equ .
120