These are the Sol-20 disk images from Larry Kramer but with CP/M on the boot
boot tracks updated with the BIOS by Mike Douglas (SOLBIOS.ASM). This BIOS
provides IOBYTE features as shown below and fixes keyboard/display problems
with the BIOS originally on the disks:

  1) The DEL performs normal destructive backspace instead of echoing
     the deleted character.

  2) The problem with extra blank lines and the disappearing command
     line are both fixed.

The utilties PCGET and PCPUT to exchange files with a PC via the Sol-20
serial port using XMODEM on the PC have been added to all three disks.

The file CPMSOL.COM is the SYSGEN ready image of CP/M that has been
installed on these disks.

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IOBYTE values 0-3 for each device specify the Sol-20 pseudo port number
to use for I/O. This assignment works out as shown here:

CON device (bits 1,0):                    PUN device (bits 5,4):
  00 - TTY on Sol-20 Keyboard/Display*      00 - TTY on Sol-20 Display
  01 - CRT on Sol-20 Serial Port            01 - PTP on Sol-20 Serial Port*
  10 - BAT on Sol-20 Printer Port           10 - UP1 on Sol-20 Printer Port 
  11 - UC1 on DJ2D Serial Port              11 - UP2 on on DJ2D Serial Port


RDR device (bits 3,2):                    LST device (bits 7,6):
  00 - TTY on Sol-20 Keyboard               00 - TTY on Sol-20 Display
  01 - PTR on on Sol-20 Serial Port*        01 - CRT on on Sol-20 Serial Port
  10 - UR1 on Sol-20 Printer Port           10 - LPT on Sol-20 Printer Port*
  11 - UR2 on on DJ2D Serial Port           11 - UL1 on DJ2D Serial Port

*Default IOBYTE

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Use the PC2FLOP utility in the disk_image_transfer folder to write these disk
images to a floppy. See the ReadMe file in the disk image transfer folder for
instructions. These Sol-20 disk images are double-density with 26 sectors of
256 bytes each.