bdale@winfree.UUCP (03/22/87)
As I mentioned previously, a friend and I got Minix moved to 3.5 disks and
have been playing with it on my Toshiba T1100+ and his Zenith 181. The
original method was to sort of diskcopy the 360k distribution disks onto
the first half of 720k floppies...
The following is a diff of the changes I made to kernel/floppy.c to support
720k disks in 720k drives. No promises, but it seems to be working on my
Toshiba. The only gotcha is that if you have Minix up and want to do a
mkfs of a 720k floppy, the invocation seems to need to be:
mkfs /dev/at1 720
as it complains that 720k is too big for the minor device when you try to
do it with /dev/fd1. Once the fs is made, it doesn't seem to matter. This
may just be due to it assuming 360k, I haven't thought it all through yet.
*** floppy.c.dist Sat Mar 21 10:01:06 1987
--- floppy.c Sat Mar 21 21:11:24 1987
***************
*** 15,20 ****
--- 15,21 ----
* floppy_task: main entry when system is brought up
*
* Changes:
+ * 870321 Bdale add table entry for 720k drives, up max drives to 4
* 27 october 1986 by Jakob Schripsema: fdc_results fixed for 8 MHz
*/
***************
*** 102,111 ****
#define MOTOR_RUNNING 0xFF /* message type for clock interrupt */
#define MAX_ERRORS 20 /* how often to try rd/wt before quitting */
#define MAX_RESULTS 8 /* max number of bytes controller returns */
! #define NR_DRIVES 2 /* maximum number of drives */
#define DIVISOR 128 /* used for sector size encoding */
#define MAX_FDC_RETRY 100 /* max # times to try to output to FDC */
! #define NT 4 /* number of diskette/drive combinations */
/* Variables. */
PRIVATE struct floppy { /* main drive struct, one entry per drive */
--- 103,112 ----
#define MOTOR_RUNNING 0xFF /* message type for clock interrupt */
#define MAX_ERRORS 20 /* how often to try rd/wt before quitting */
#define MAX_RESULTS 8 /* max number of bytes controller returns */
! #define NR_DRIVES 4 /* maximum number of drives */
#define DIVISOR 128 /* used for sector size encoding */
#define MAX_FDC_RETRY 100 /* max # times to try to output to FDC */
! #define NT 5 /* number of diskette/drive combinations */
/* Variables. */
PRIVATE struct floppy { /* main drive struct, one entry per drive */
***************
*** 141,156 ****
! /* Four combinations of diskette/drive are supported:
* # Drive diskette Sectors Tracks Rotation Data-rate Comment
* 0 360K 360K 9 40 300 RPM 250 kbps Standard PC DSDD
! * 1 720K 360K 9 40 300 RPM 250 kbps Quad density PC
! * 2 1.2M 360K 9 40 360 RPM 300 kbps PC disk in AT drive
! * 3 1.2M 1.2M 15 80 360 RPM 500 kbps AT disk in AT drive
*/
! PRIVATE int gap[NT] = {0x2A, 0x2A, 0x23, 0x1B}; /* gap size */
! PRIVATE int rate[NT] = {0x02, 0x02, 0x01, 0x00}; /* 250,300,500 kbps*/
! PRIVATE int nr_sectors[NT] = {9, 9, 9, 15}; /* sectors/track */
! PRIVATE int nr_blocks[NT] = {720, 720, 720, 2400}; /* sectors/diskette*/
! PRIVATE int steps_per_cyl[NT] = {1, 2, 2, 1}; /* 2 = dbl step */
! PRIVATE int mtr_setup[NT] = {HZ/4,HZ/4,3*HZ/4,3*HZ/4};/* in ticks */
/*===========================================================================*
* floppy_task *
--- 142,164 ----
! /* Five combinations of diskette/drive are supported:
* # Drive diskette Sectors Tracks Rotation Data-rate Comment
* 0 360K 360K 9 40 300 RPM 250 kbps Standard PC DSDD
! * 1 720K 360K 9 40 300 RPM 250 kbps 80trk drv, PC disk
! * 2 720K 720K 9 80 300 RPM 250 kbps 80trk drv, 720k disk
! * 3 1.2M 360K 9 40 360 RPM 300 kbps PC disk in AT drive
! * 4 1.2M 1.2M 15 80 360 RPM 500 kbps AT disk in AT drive
*/
! PRIVATE int gap[NT] =
! {0x2A, 0x2A, 0x2A, 0x23, 0x1B}; /* gap size */
! PRIVATE int rate[NT] =
! {0x02, 0x02, 0x02, 0x01, 0x00}; /* 250,300,500 kbps*/
! PRIVATE int nr_sectors[NT] =
! {9, 9, 9, 9, 15}; /* sectors/track */
! PRIVATE int nr_blocks[NT] =
! {720, 720, 1440, 720, 2400}; /* sectors/diskette*/
! PRIVATE int steps_per_cyl[NT] =
! {1, 2, 1, 2, 1}; /* 2 = dbl step */
! PRIVATE int mtr_setup[NT] =
! {HZ/4, HZ/4, HZ/4, 3*HZ/4,3*HZ/4};/* in ticks */
/*===========================================================================*
* floppy_task *
--
Bdale Garbee, N3EUA phone: 303/593-9828 h, 303/590-2868 w
uucp: {bellcore,crash,hp-lsd,hpcsma,ncc,pitt,usafa,vixie}!winfree!bdale
fido: sysop of 128/19 packet: n3eua @ k0hoa, Colorado Springs