home *** CD-ROM | disk | FTP | other *** search
- 22DISK Version 1.31 Release Notes
-
- We've made some changes to 22DISK in release 1.31 that affect
- 22DISK's installation and configuration procedures.
-
- One change that requires some explanation is the inclusion of a
- step-rate specification when setting up the diskette configura-
- tion. Almost all 5.25" diskette drives made since 1981 can move
- their read/write heads from one track to the next in 6 mil-
- liseconds or less. Some older 5.25" diskette drives, such as the
- Shugart 450, and quite a number of 8" diskette drives, such as
- the Shugart 801, require that a longer time between the pulses
- used to signal a head movement be used. A step interval from 2
- milliseconds to 28 milliseconds may be specified for each drive
- during installation of 22DISK. Please note that, in almost all
- cases involving modern 5.25" drives, this interval may be left at
- the 6 millisecond default.
-
- We lowered the minimum memory size requirement for the installa-
- tion program 22DINST from 512K to 256K, so that 22DISK can be
- used on "leaner" systems.
-
- If you have any question regarding version 1.31 changes, please
- feel free to contact us.
-
-
- Using Cromemco CDOS Diskettes with 22DISK
-
- We've found that while 22DISK generally will not be able to read
- Cromemco CDOS diskettes formatted on a Cromemco computer, a dis-
- kette that has first been formatted by the Cromemco, then for-
- matted by 22DISK will work well on both 22DISK and the Cromemco.
- In short, format your diskettes with the Cromemco, then with
- 22DISK, then copy the files you need to transfer with the
- Cromemco.
-
-
- Using 8" Drives with 22DISK
-
- We've had quite a number of inquiries about operating 8" diskette
- drives with 22DISK. While not all 8" drives have the same con-
- nector pinout,, we'll consider the most common, that of the
- Shugart 800-series here. This particular connection scheme is
- known to include the following drive families:
-
- 1. Siemens 100/200
- 2. Qume 840
- 3. Innovex 200/400
- 4. Memorex 550
-
- Note that if you decide to construct an external 8" drive setup
- yourself, you'll have to provide a power supply which furnishes
- both +5 and +24 volts. In addition, some older drives also re-
- quire a small -5 volt supply. The simplest way to construct a
- cable which will connect the drive to a DC-37 male connector
- which will plug into the external drive socket attached to the
- mounting bracket of a suitable diskette adapter card is as fol-
- lows:
-
- 1. Using a 50 conductor ribbon cable, crimp a 50 pin card
- edge connector to one end.
-
- 2. Use the following chart to pair up the appropriate rib-
- bon cable conductors with the DC 37 pins. Note that
- the DC 37 numbers its pins from 1 to 19 on the first
- row and from 20 through 37 on the second row, while the
- ribbon cable is numbered consecutively from one side
- (pin 1) to the other (pin 50). With a bit of care you
- should be able to make use of a DC 37 ribbon cable con-
- nector instead of the solder-cup variety:
-
- DC 37 pin 1 - 5 No Connection DC 37 pin 13 Ribbon 38 (WDATA)
- 6 Ribbon 20 (INDEX) 14 " 40 (WGATE)
- 7 " 18 (HD LD) 15 " 42 (TK00)
- 8 " 28 (DS1) 16 " 44 (WPROT)
- 9 " 26 (DS0) 17 " 46 (RDATA)
- 10 No Connection 18 " 14 (HDSEL)
- 11 Ribbon 34 (DIR) 19 No Connection
- 12 " 36 (STEP) 20-37 Ribbon 1,3,5... (GND)
-
- Set the drive select jumper on the drive for DS0 (the first
- select). The drive will be addressable as physical unit 2; you
- can select any drive letter you wish when configuring 22DISK.
- Note that a diskette controller capable of high-density operation
- must be used for 8" drives, such as the Western Digital WD
- 1002A-FOX, Sysgen Omnibridge or MicroSolutions CompatiCard.
-
- This is clearly not a project for a beginner. The cable itself
- takes some patience to construct, but usually can be built in
- less than one hour. This arrangement is in use here at Sydex
- with a Qume 842 drive with excellent results.
-
- 22Disk Version 1.32 Release Notes
-
- Some minor changes have been made to 22Disk for the 1.32 version.
- Most deal with expanding the range of CP/M formats that 22Disk is
- able to handle.
-
- 1. The format type prompt has been altered. In previous
- versions, CMENU displayed the following prompt in
- response to menu choice 1, "Select CP/M diskette type":
-
- Enter 1-4 character CP/M diskette type or ? for list -
-
- The problem with this prompt was that nothing happened
- until the ENTER key was pressed after pressing the "?"
- key. This prompt has been changed to:
-
- Enter 1-4 character CP/M diskette type or ENTER alone for list -
-
- Simply pressing the ENTER key will now bring up the
- diskette type menu.
-
- 2. The EVEN-ODD keyword has been added. Certain diskette
- formats, such as that of the Archive II system, put
- even-numbered cylinders on one side of a diskette and
- odd-numbered cylinders on the other. If the keyword
- EVEN-ODD is specified in a definition, disk addresses
- will be calculated for this format.
-
- 3. "Upside-down" diskette formats are now supported. The
- Sharp MZ-80B uses a double-sided format in which side 2
- is first addressed, then side 1. This is the reverse
- of the "normal" ORDER SIDES form of addressing. If the
- SIDE2 definition is specified before SIDE1, this
- "upside down" form of addressing will be enabled.
-
- 4. Mixed density formatting - the SKIP keyword. If the
- keyword SKIP is included in a format definition, CFMT
- will not format "system" tracks. That is, the tracks
- called out by the OFS parameter. A mixed-density for-
- mat may be created by writing two definitions for a
- diskette--the first for the system tracks, the second
- for the data area.
-
- 5. Format name character set extension. Any of the fol-
- lowing characters may be used to name a diskette for-
- mat:
-
- A through Z, a through z, @#$%^&-_
-