Special interest message for those tinkerers who have the pre-rev 
2.3  BIOS and are too cheap to invest in a $25 update,  but would 
rather  grind it out themselves:  There is still hope for  moving 
your system to 59K!  Using these simple (uhh...) steps,  you  can 
move  your system to a working 59k CP/M that can then be used  to 
install ZCPR3.
     This  installation is in four parts:  (1) Generate a bad 59k 
system  using  MOVCPM,  (2) Re-assemble the BIOS and  cold  start 
loader  for 59k,  (3) integrate the new BIOS and loader into  the 
59K cp/M image, (4) put the new image on the system tracks.

Files needed:  
               M80.com                  Microsoft Macro assembler
               L80.COM                  Microsoft Linking Loader
               MOVCPM, SYSGEN, DDT
               CBIOS.MAC,   CBOOT.MAC   BIOS  and  Boot   code 
                                        supplied by MORROW.

     First,  get  a 59k "non-working" system by using MOVCPM  and 
then saving it as "DFNCT59K.COM":

               MOVCPM 59 *
               SAVE 46 DFNC59K.COM

     THen,  edit CBIOS.MAC and CBOOT.MAC, changing the MEMSIZE to 
59: (a line in the beginning of the code should look like this)
                        MEMSIZE   EQU  64
    
            (and should be changed to look like this)
                        MEMSIZE   EQU  59

Then, you must Assemble CBIOS and CBOOT using M80.
Link the two as follows:

     L80 /p:100,CBIOS,CBIOS/n/x/e
     l80 /p:100,CBOOT,CBOOT/n/x/e

     You then should have to hex files CBOOT.HEX and CBIOS.HEX.

Then,  use DDT to integrate the new BIOS and loader into the CP/M 
image:

   A>  DDT DFNC59k.com
  [signon etc...]
     - ICBOOT.HEX
     - R800
     - ICBIOS.HEX
     - R2200
     - ^C [control c]
   A>  SAVE 46 CPM59.com

You  are  now ready to SYSGEN the image onto the  new  disk.  (No 
source drive; Destination drive: The one for tHe new system.)

Presto! You now have a perfectly good 59K Cp/M system. (with only 
4 hours of work..)

      This needlessly complex blurb was brought to you by:
                           Erik Olson 
                346-8194 (voice) 348-3348 (modem)