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*
** FLEX 9 COMPACT FLASH DISK DRIVERS
*
* FOR SYS09BUG 1.2 ON THE BURCHED B5-X300
* WITH I/O MAPPED AT $XE000
* AND ROM MAPPED AT $XF000
* THE BURCHED B5-X300 HAS 256KBYTES OF SRAM
* THE FIRST 64K IS USED BY FLEX,
* THE SECOND 192K MAY BE USED AS A RAM DISK
*
*
IMASK  EQU $10     IRQ MASK CC
FMASK  EQU $40     FIRQ MASK CC
DATREG EQU $FFF0   DAT REGISTERS
*
CF_BASE    EQU $E040
CF_DATA    EQU CF_BASE+0
CF_ERROR   EQU CF_BASE+1 ; read error
CF_FEATURE EQU CF_BASE+1 ; write feature
CF_SECCNT  EQU CF_BASE+2
CF_SECNUM  EQU CF_BASE+3
CF_CYLLO   EQU CF_BASE+4
CF_CYLHI   EQU CF_BASE+5
CF_HEAD    EQU CF_BASE+6
CF_STATUS  EQU CF_BASE+7 ; read status
CF_COMAND  EQU CF_BASE+7 ; write command
*
* Command Equates
*
CMDREAD    EQU $20 ; Read Single sector
CMDWRITE   EQU $30 ; Write Single sector
CMDFEATURE EQU $EF
FEAT8BIT   EQU $01 ; enable 8 bit transfers
HEADLBA    EQU $E0
*
* Status bit equates
*
BSY        EQU $80
DRDY       EQU $40
DRQ        EQU $08
ERR        EQU $01
       ORG   $DE00
*
* DISK DRIVER JUMP TABLE
*
READ   JMP   READSC
WRITE  JMP   WRITSC
VERIFY JMP   BUSY
RESTOR JMP   RESTR1
DRIVE  JMP   DRVSEL
DRVRDY JMP   CHKDRV
QUICK  JMP   CHKDRV
COLDDR JMP   INITDR
WARMDR JMP   WARMD1
SEEK   JMP   SEEKTS
*
* RAM SPACE
*
DRVNUM FCB   0
*
*
* INITIALIZE CF CARD FOR 8 BIT LBA MODE
*
INITDR BSR WAITRDY
       LDA  #HEADLBA
       STA  CF_HEAD
       LDA #FEAT8BIT
       STA CF_FEATURE
       LDA #CMDFEATURE
       STA CF_COMAND
       BRA WAITRDY
*
* RESTORE DISK DRIVER (SEEK TRACK 00)
*
RESTR1 BSR   DRVSEL
       CLRA           ; Track 0
       LDB   #$01     ; Sector 1
*
* Seek track and sector
* A holds track number (0 - ??)
* B holds sector number (1 - ??)
* Sector numbers starts from 1
* subtract 1 to start from sector 0 on CF
*
SEEKTS DECB
       STB  CF_SECNUM
       STA  CF_CYLLO
       LDB  DRVNUM
       STB  CF_CYLHI
       LDB  #$01
       STB  CF_SECCNT
       CLRB
WARMD1 RTS
*
* READ SECTORS FROM CF
*
*
READSC BSR  SEEKTS
       LDA  #CMDREAD ; IDE READ MULTIPLE
       STA  CF_COMAND
       BSR  WAITRDY
*
* READ LOOP
*
       CLRB
RDLP1  BSR  WAITDRQ
       LDA  CF_DATA
       STA  ,X+
       DECB
       BNE  RDLP1
*
       CLRB
RDLP2  BSR  WAITDRQ
       LDA  CF_DATA
       DECB
       BNE  RDLP2
*
       BSR  WAITRDY
       CLRB
       RTS
*
* WRITE SECTOR TO CF
*
WRITSC BSR  SEEKTS   ; SEEK TRACK & SECTOR
       LDA  #CMDWRITE; IDE WRITE MULTIPLE
       STA  CF_COMAND
       BSR  WAITRDY
*
* WRITE LOOP
*
       CLRB
WRTLP1 BSR  WAITDRQ
       LDA  ,X+
       STA  CF_DATA
       DECB
       BNE  WRTLP1
*
       CLRB
WRTLP2 BSR  WAITDRQ
       CLRA
       STA  CF_DATA
       DECB
       BNE WRTLP2
*
       BSR  WAITRDY
       CLRB
       RTS
*
* CHECK FOR BUSY
* Doubles as VERIFY
*
BUSY   CLRB            Never busy
       RTS
*
* DRIVE SELECT DISK DRIVER
*
DRVSEL LDA   3,X       GET DRIVE # FROM FCB
       CMPA  #3
       BLS   DRVS2     IF > 3, SET IT TO 0
       CLRA
DRVS2  STA   DRVNUM
       CLRB            ; SET Z, CLEAR C
       RTS
*
* CHECK DRIVE READY DISK DRIVER
*
CHKDRV LDA  3,X
       CLRB             ; CLEAR C, SET Z
       RTS
*
* WAIT UNTIL READY
*
WAITRDY LDA  CF_STATUS
        BITA #BSY
        BNE  WAITRDY
        LDA  CF_STATUS
        BITA #DRDY
        BEQ  WAITRDY
        RTS
*
* WAIT FOR DATA REQUEST
*
WAITDRQ LDA  CF_STATUS
        BITA #DRQ
        BEQ  WAITDRQ
        RTS
*
        END
 

Line No.	Rev	Author	Line
1	42	davidgb	`*`
2			`** FLEX 9 COMPACT FLASH DISK DRIVERS`
3			`*`
4			`* FOR SYS09BUG 1.2 ON THE BURCHED B5-X300`
5			`* WITH I/O MAPPED AT $XE000`
6			`* AND ROM MAPPED AT $XF000`
7			`* THE BURCHED B5-X300 HAS 256KBYTES OF SRAM`
8			`* THE FIRST 64K IS USED BY FLEX,`
9			`* THE SECOND 192K MAY BE USED AS A RAM DISK`
10			`*`
11			`*`
12			`IMASK EQU $10 IRQ MASK CC`
13			`FMASK EQU $40 FIRQ MASK CC`
14			`DATREG EQU $FFF0 DAT REGISTERS`
15			`*`
16			`CF_BASE EQU $E040`
17			`CF_DATA EQU CF_BASE+0`
18			`CF_ERROR EQU CF_BASE+1 ; read error`
19			`CF_FEATURE EQU CF_BASE+1 ; write feature`
20			`CF_SECCNT EQU CF_BASE+2`
21			`CF_SECNUM EQU CF_BASE+3`
22			`CF_CYLLO EQU CF_BASE+4`
23			`CF_CYLHI EQU CF_BASE+5`
24			`CF_HEAD EQU CF_BASE+6`
25			`CF_STATUS EQU CF_BASE+7 ; read status`
26			`CF_COMAND EQU CF_BASE+7 ; write command`
27			`*`
28			`* Command Equates`
29			`*`
30			`CMDREAD EQU $20 ; Read Single sector`
31			`CMDWRITE EQU $30 ; Write Single sector`
32			`CMDFEATURE EQU $EF`
33			`FEAT8BIT EQU $01 ; enable 8 bit transfers`
34			`HEADLBA EQU $E0`
35			`*`
36			`* Status bit equates`
37			`*`
38			`BSY EQU $80`
39			`DRDY EQU $40`
40			`DRQ EQU $08`
41			`ERR EQU $01`
42			`ORG $DE00`
43			`*`
44			`* DISK DRIVER JUMP TABLE`
45			`*`
46			`READ JMP READSC`
47			`WRITE JMP WRITSC`
48			`VERIFY JMP BUSY`
49			`RESTOR JMP RESTR1`
50			`DRIVE JMP DRVSEL`
51			`DRVRDY JMP CHKDRV`
52			`QUICK JMP CHKDRV`
53			`COLDDR JMP INITDR`
54			`WARMDR JMP WARMD1`
55			`SEEK JMP SEEKTS`
56			`*`
57			`* RAM SPACE`
58			`*`
59			`DRVNUM FCB 0`
60			`*`
61			`*`
62			`* INITIALIZE CF CARD FOR 8 BIT LBA MODE`
63			`*`
64			`INITDR BSR WAITRDY`
65			`LDA #HEADLBA`
66			`STA CF_HEAD`
67			`LDA #FEAT8BIT`
68			`STA CF_FEATURE`
69			`LDA #CMDFEATURE`
70			`STA CF_COMAND`
71			`BRA WAITRDY`
72			`*`
73			`* RESTORE DISK DRIVER (SEEK TRACK 00)`
74			`*`
75			`RESTR1 BSR DRVSEL`
76			`CLRA ; Track 0`
77			`LDB #$01 ; Sector 1`
78			`*`
79			`* Seek track and sector`
80			`* A holds track number (0 - ??)`
81			`* B holds sector number (1 - ??)`
82			`* Sector numbers starts from 1`
83			`* subtract 1 to start from sector 0 on CF`
84			`*`
85			`SEEKTS DECB`
86			`STB CF_SECNUM`
87			`STA CF_CYLLO`
88			`LDB DRVNUM`
89			`STB CF_CYLHI`
90			`LDB #$01`
91			`STB CF_SECCNT`
92			`CLRB`
93			`WARMD1 RTS`
94			`*`
95			`* READ SECTORS FROM CF`
96			`*`
97			`*`
98			`READSC BSR SEEKTS`
99			`LDA #CMDREAD ; IDE READ MULTIPLE`
100			`STA CF_COMAND`
101			`BSR WAITRDY`
102			`*`
103			`* READ LOOP`
104			`*`
105			`CLRB`
106			`RDLP1 BSR WAITDRQ`
107			`LDA CF_DATA`
108			`STA ,X+`
109			`DECB`
110			`BNE RDLP1`
111			`*`
112			`CLRB`
113			`RDLP2 BSR WAITDRQ`
114			`LDA CF_DATA`
115			`DECB`
116			`BNE RDLP2`
117			`*`
118			`BSR WAITRDY`
119			`CLRB`
120			`RTS`
121			`*`
122			`* WRITE SECTOR TO CF`
123			`*`
124			`WRITSC BSR SEEKTS ; SEEK TRACK & SECTOR`
125			`LDA #CMDWRITE; IDE WRITE MULTIPLE`
126			`STA CF_COMAND`
127			`BSR WAITRDY`
128			`*`
129			`* WRITE LOOP`
130			`*`
131			`CLRB`
132			`WRTLP1 BSR WAITDRQ`
133			`LDA ,X+`
134			`STA CF_DATA`
135			`DECB`
136			`BNE WRTLP1`
137			`*`
138			`CLRB`
139			`WRTLP2 BSR WAITDRQ`
140			`CLRA`
141			`STA CF_DATA`
142			`DECB`
143			`BNE WRTLP2`
144			`*`
145			`BSR WAITRDY`
146			`CLRB`
147			`RTS`
148			`*`
149			`* CHECK FOR BUSY`
150			`* Doubles as VERIFY`
151			`*`
152			`BUSY CLRB Never busy`
153			`RTS`
154			`*`
155			`* DRIVE SELECT DISK DRIVER`
156			`*`
157			`DRVSEL LDA 3,X GET DRIVE # FROM FCB`
158			`CMPA #3`
159			`BLS DRVS2 IF > 3, SET IT TO 0`
160			`CLRA`
161			`DRVS2 STA DRVNUM`
162			`CLRB ; SET Z, CLEAR C`
163			`RTS`
164			`*`
165			`* CHECK DRIVE READY DISK DRIVER`
166			`*`
167			`CHKDRV LDA 3,X`
168			`CLRB ; CLEAR C, SET Z`
169			`RTS`
170			`*`
171			`* WAIT UNTIL READY`
172			`*`
173			`WAITRDY LDA CF_STATUS`
174			`BITA #BSY`
175			`BNE WAITRDY`
176			`LDA CF_STATUS`
177			`BITA #DRDY`
178			`BEQ WAITRDY`
179			`RTS`
180			`*`
181			`* WAIT FOR DATA REQUEST`
182			`*`
183			`WAITDRQ LDA CF_STATUS`
184			`BITA #DRQ`
185			`BEQ WAITDRQ`
186			`RTS`
187			`*`
188			`END`
189

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[/] [System09/] [branches/] [mkfiles_rev1/] [src/] [Flex9/] [f9-dkcf8.asm] - Blame information for rev 78