Date   : Wed, 20 Jul 1983 1427-:00PDT
From   : JHESS@usc-eclb
Subject: dGRAPH with CCS 2422

If anyone has has purchased dGRAPH to run on their CPM system using
a CCS Floppy Disk Controller, the following error message should be
familiar:
     "Overlay Loader:  .PRG file missing or truncated"

The problem occurs because both California Computer and FOX & GELLER
use locations 50-->5B hex.  The fix is simple and is described in Jerry
Pournelle's July 83 column in BYTE (pp 353).

You have to modify your BIOS to move the DEBLOCK PARAMETERS out of page 0
of memory.  Use your editor to modify the CCS BIOS as follows:
  1. Find and delete the statement
     IDSV:   EQU 4EH   ;Sector ID Save area
  2. Find the statement
     BEGDAT  EQU$
  3. Add immediately after the statement defining BEGDAT
     IDSV:   DS  8
  4. Assemble the BIOS and install as described in the CCS manual

Read Jerry's column for additional information.