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Commodore 128 CP/M 3.0
BIOS revision 6
28 May 1987 version
Modified 12 October 1992
Second Release - 31 Jan 93 by
Randy Winchester
LEGAL STUFF & DISCLAIMER: I'm claiming no copyright on any of this
material. I didn't write most of it myself, these are just my
modifications and implimentation. Copyrights are held by Commodore. The
user of this code assumes all responsibility for all damages or losses,
so don't do anything with this code that might cause damages or losses.
BIOS R6 - Release 2 Notes
There were some problems with the first release of BIOS R6. Somehow, an
obsolete version of CXEQU.LIB crept into the LBR that was distributed.
This caused some assembly errors, as some labels weren't defined.
Another problem was the default drive search chain that I'd set up. It
works great for me, but then, I have an REU and a Quick Brown Box. Other
people had tried assembling the system without editing the drive search
chain in CXIO.ASM. I set it back to a more reasonable "A:,*" so it should
work "straight out of the box."
This was also a great opportunity to add some more comments to the source
code where they were needed. For anyone interested in customizing a CP/M
system to better suit their needs, I suggest glancing at the ASM and LIB
files - at least the first screen or two of the files that have been
modified. Most of the configuration options are commented fairly well, and
it shouldn't take a lot of programming skill to change them. If I ever get
around to doing another release, I'll try to include all user configurable
options in a CONFIG.LIB file.
Oh. One more thing. I fixed the long standing BIOS bug that screws up the
keyboard response after exiting a terminal program. It took only two lines
of code to fix it. Take a look at the file CXIO.ASM for more details.
Why BIOS R6?
This update of the C128 CP/M BIOS includes full support for the
"official" C128 CP/M 1581 disk format. The included CXDISK.ASM file
still includes all other changes as stated in this documentation.
A bug fix was made to the RAMDISK label in the module CXRAMDSK.ASM. The
label was changed from 'ERTWINE VON' to ' ERTWINE VON' to avoid
potential incompatibility problems with some software. See the section
on CXRAMDSK.ASM in the following BIOS R5 documentation to see why it was
changed in the first place.
ZPM3 and BIOS R6 - A Winning Combination
One major reason you might want to spend the effort to generate a new
BIOS is to include Simeon Cran's excellent ZPM3 BDOS segments. This BDOS
is coded in fast tight Z80 assembly and adds a boost in speed, bug fixes,
and additional features. It's not possible to add ZPM3 to a C128
CPM+.SYS using the ZPM3 MAKEDOS utility. Generating a new BIOS seems to
be the only way on the 128. The necessary ZPM3 files are included with
this distribution. If you've only used "stock" CP/M on a 128, you owe it
to yourself to give ZPM3 and BIOS R6 a try.
BIOS R5 Notes
This version of a BIOS for the Commodore 128 is based on BIOSR4.ARK
from James Waltrip IV. Mr. Waltrip took care of many of the essentials
a couple of years ago. He slashed out a lot of unneeded code and added
a great screen dump. My revisions were to add back some of the things
I've wanted or needed.
I made modifications to the following:
CXIO .ASM CXDISK .ASM
CXKEY .ASM CXRAMDSK.ASM
CXPRINTE.ASM CXEXT .ASM
All other files in this library are unmodified from the version in
BIOSR4.ARK.
Most of my additions are to support additional hardware.
* Drive D: is available (it was taken out in BIOSR4).
* A Drive E: has been added. This isn't to be confused with the
virtual disk drive in the official Commodore releases of CP/M. The
intended purpose of this drive E: is to make an entry in the drive
table that can be used by QD.COM for an entry for the Quick Brown Box.
The Quick Brown Box is a 64K battery backed-up RAM cartridge. QD is a
product of Herne Data Systems, Ltd. QD installs a driver for the Quick
Brown Box that allows it to be used as a RAM disk. By entering the
command: QD F/F, the Quick Brown Box is set up as Drive F:. I keep my
favorite utilities stored there so I can have them as soon as the
system boots up.
* Definitions have been added to the disk parameter table for two of my
favorite disk formats, 'Maxi 71' and '1581 GP'. Maxi 71 is from Miklos
Garamszeghy's article in 'The Transactor' on adding support for more
foreign disk formats. Maxi 71 offers an incredible 398K. Disks can be
formatted using Garamszeghy's public domain FORMAT22 or his
commercially available package, Jugg'ler. The latest version of
Jugg'ler supports over 130 CP/M disk formats.
* 1581 GP is a 796K format for 3.5 inch disks. Gene Pizzetta wrote
FORMAT81 for adding 1581 disk support before the 1581 Commodore version
was released. He did a good job. Not does his format hold more than
Commodore's, it also seems faster than Commodore's format. I haven't
taken the time to verify this - just try it out and see what you think.
Disks for 1581 GP can be formatted using Gene's public domain FORMAT81.
* The default LST device is now an ASCII printer, device 4. The
secondary address has been changed to 5. This allows for transparent
mode with the Xetec SuperGraphix interface without added line feeds.
If you need to use a Commodore printer, replace FAST8502.ASM with the
version found in BIOS4MOD.LBR, and replace CXPRINTE.ASM with the
original version found on the DRI Source Code/Utilities disks.
Here's the nitty-gritty, file by file:
--------------------------------------------------------------------------
CXIO.ASM
--------------------------------------------------------------------------
*ADDITIONS BY Randy Winchester, 5/6/89
Default printer is device 4.
Set up for non-flashing block cursor
Search chain/temp drive: M:,*,F: [TEMP=M:]
Drive F: is reserved for the Quick Brown Box battery powered RAM cartridge.
The QBB is initialized with QD.COM from Herne Data Systems, Ltd.
No password protection for booting the system.
Colors set in sign-on message. Background=lt. gray, character=blue
Default system baud rate set for 75 baud. This speeds up normal operation
considerably.
Printer names set to PRT-D4 and PRT-D5 (devices 4 and 5)
--------------------------------------------------------------------------
--------------------------------------------------------------------------
CXKEY.ASM
--------------------------------------------------------------------------
* ADDITIONS by Randy Winchester, 5/3/89
Added drive D: to MFM unlock routine.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
CXPRINTE.ASM
--------------------------------------------------------------------------
Set the secondary address to 5 to work properly with the Xetec
SuperGraphix in transparent mode. -RW, 5/6/89
--------------------------------------------------------------------------
--------------------------------------------------------------------------
CXRAMDSK.ASM
--------------------------------------------------------------------------
CHANGES by Randy Winchester, 6 May 89
RAM disk is now drive M: again.
Disk Label for the RAM disk has been changed back to ERTWINE VON from
RAMDISK RAM. Not only do I believe in honoring programmers rather
than hardware, there was no need to fuss with it in the first place.
No need to tempt fate.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
CXEXT.ASM
--------------------------------------------------------------------------
CHANGES by Randy Winchester, 6 May 89
Drive D: returned to active duty.
RAM disk set back to drive M:
Table entry made for Drive E:, used by Quick Brown Box.
--------------------------------------------------------------------------
Notes:
I think the CXKYCODE.ASM file that is included with the ARKhive is
lacking in many ways. Rather than edit the file, there are easier ways
to include key definitions in a CPM+.SYS file. I highly recommend
KEYFIG from the original Commodore system disk for defining the
keyboard layout. Once you have the keyboard configured the way you
like it, you can use KEYFIG to save the layout in your new CPM+.SYS.
Other tools that are helpful in this regard are the public domain
SAVEKEY and LOADKEY by Gene Pizzetta. These programs save or load
keyboard definitions in files, and can be used to transfer custom key
layouts from an old CPM+.SYS to a new CPM+.SYS.
I'd love to add support for Commodore's "official" 1581 disk format.
I've hacked most of it out of a copy of the 28 May 87 release, but I
haven't been able to make it work. If anyone can show me the code to
support the 1581, or a Disk Parameter Table entry for Commodore's
format, please pass it along.
Please make sure to read all of the documentation in this archive.
If you have hints, tips, bug reports, suggestions, I'd like to hear
them. Please write me.
Randy Winchester
P.O. Box 1074
Cambridge, MA 02142
or the BCS/CUG BBS, 617/729-7340
or Internet: randy@mit.edu