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- RDCBM
-
- A Commodore To CP/M File Copy Utility
-
- By Rob Tillotson
-
- Version 2.1 - Mar. 8, 1987
-
- Copyright 1986,1987 by TurboPenguin Software
-
-
-
- This program is a general purpose file copier, which copies from a
- Commodore DOS format disk to a CP/M disk. It is designed to be faster
- and more convenient to use than any of the existing CBM->CP/M copiers.
- It uses burst mode on 1571 drives, and can write to the 17xx RAM
- expander or to a 1571 onto any format disk the drive supports. It does
- not require you to exit from CP/M to use it, as it is a CP/M transient
- utility.
- Version 2.1 adds some support for GEOS disks. Now, GEOS files will
- be displayed in the directory with their GEOS filetype, time/date
- stamp, and write protect status. If the disk is a GEOS disk, this fact
- will be noted, as will be the presence of the "Master" or "Boot" flag.
- Also, the Off-Page Directory Block will be searched whenever a file is
- opened or the directory is displayed. Finally, a new option is
- available on the menu which will display the Information Block of a
- GEOS file.
- Other small improvements include a "[more]" pause at the end of
- each screen page during a directory listing or text file viewing, and
- the display of the disk name and ID at the top of the directory.
-
- Hardware requirements are as follows:
-
- o A Commodore 128 computer
-
- o At least one 1541 or 1571 disk drive (1571 recommended)
-
- o Optional but recommended 1700 or 1750 RAM expansion
-
-
- The program is set up to operate with two drives, and in fact this
- decreased the code size substantially. However, it works reasonably
- well with one floppy if you select drive E as the second drive.
-
- RDCBM expects to find a Commodore DOS disk in one drive, and a CP/M
- disk in the other. The Commodore drive must be a real floppy, either
- 1571 or 1541. The CP/M drive may be a physical drive, or a pseudo-
- drive such as E: or M: if you have a RAM expander. The program
- defaults to Commodore disk in A: and CP/M disk in M:; these may be
- changed at the main menu.
-
- When copying, RDCBM uses an internal 24k buffer to hold file data,
- to cut down on the amount of disk swapping necessary on a one drive
- system, and to reduce the number of file operations performed on the
- CP/M disk. The net effect of this is that when you copy to drive E:,
- you only have to swap disks every 24k or when the file is complete.
-
- To use this program, place RDCBM.COM on any active drive, and type
- RDCBM. The program will load and a menu will be displayed, along with
- the letters of the selected drives. At this time, you should place the
- Commodore disk in the drive you wish to copy from. If you do not like
- the default drive choices, use the P option to change them.
-
- To select an option, type it's letter in upper or lower case alone
- at the prompt and hit return. The options are:
-
- [B] Binary CBM -> CP/M Copy
-
- Copies a BINARY file from the Commodore disk to the CP/M
- disk. No conversions are done.
-
- [D] Directory of CBM Disk
-
- Displays the directory of the Commodore disk, in a
- reasonably Commodore-like format. GEOS files will
- have all of their pertinent information displayed:
- type, structure, size in K, time/date stamp, and a
- reversed block for write protect. If the disk is a
- GEOS one, the Off-Page Directory will be searched as
- well.
-
- Please note that since GEOS uses true ASCII, GEOS file
- names aren't readable when treated as Commodore ASCII.
- Therefore, GEOS file names will be displayed AS YOU
- WOULD SEE THEM UNDER GEOS, not as they would appear in
- the Commodore directory. In any case, when entering a
- file name, enter it as you see it in the directory
- shown by this program. Since GEOS and Commodore files
- are non-interchangeable, this should not present a
- problem... just be aware that the directory you see in
- this program might not match the one you see when you
- view it in 128 or 64 mode.
-
- [I] Information on a GEOS File
-
- This option prompts for the name of a GEOS file on the
- CBM disk. It will display all of the information,
- except the icon, from the Information Block of the
- file. This is very similar to the "info" menu
- selection under GEOS DeskTop, but gives a bit more
- information.
-
- [S] Select Drives
-
- Change the drives used to copy from and to. Simply
- type the letter of the drive and hit return when you
- are prompted.
-
- [T] Text CBM -> CP/M Copy
-
- Copy a TEXT file from the Commodore disk to the CP/M
- disk. The file is converted from Commodore-ASCII to
- true ASCII, and linefeeds are inserted after carriage
- returns. Use this on text files.
-
- [V] View CBM Text File
-
- Similar to [T], but displays the file instead of
- copying it.
-
- [X] - Exit to CP/M.
-
-
- Entomology and Comments
- -----------------------
-
- This is the third release of RDCBM. The first one was an
- incredibly bug-infested and slow hack. Version 2.0 was the first
- usable version... at that time, I converted it to Turbo Pascal. The
- result was much faster and worked well. This is version 2.1, which
- adds a few new capabilities to version 2.0.
- As you may notice, most of the improvements have to do with GEOS.
- I feel GEOS support is important, because soon it will be THE Commodore
- operating system. It is an orders of magnitude better than Commodore
- DOS, and I expect that more and more software will be GEOS compatible
- in the future. Since an 80-column version of GEOS for the 128 will be
- out soon, it will be even more important to 128 owners.
- Now, to the bugs. Number one is really a feature, but since it may
- be surprising to some people I should mention it anyway. Like the two
- versions before it, this version of RDCBM ignores the Commodore file
- type when it copies a file. I don't intend to change this in the
- future. Anyway, this has some interesting results.
- Copying a PRG file will give you the whole file, including the two-
- byte load address at the beginning. Since the first two bytes are
- often NOT a load address, they will be copied and if you don't want
- them you must edit them out later. Copying a REL file will give you
- the contents of the data portion of the file, in fixed-length records
- of the length specified when the file was created.
- Number two bug is that it will not work on a 1571-format disk in a
- 1541. So far, I haven't found a reliable way to determine the type of
- drive, and the CP/M BIOS does not mask off improper track numbers. So
- if you attempt to read a file from the back of a 1571 disk with a 1541,
- the 1541 will try to read a track number higher than 35. This can
- cause the drive head to jam outside of normal range. To reset the
- head, issue a "format" command without a disk in the drive. If this
- doesn't work after several tries, open the drive and move the head back
- manually. As you can see, it's better to avoid the problem entirely.
- Finally, I do plan to make more improvements to RDCBM in the
- future. Version 2.2 should add support for copying GEOS text and
- program files, and GEOS Note Pad and Text Scrap support. After that, I
- plan to add the ability to write to CBM disks.
-
- Enjoy.
- nd GEOS