
Tips, Patches and Comments on the Model 4 Computers.
============================================================
These patches have been assembled from many sources. They
have not been tested for accuracy. CC/LA suggests that these
patches are only applied to backup diskettes and the programs
fully tested. Unfortunately, these patches were obtained
without credit given to the original author.
============================================================

To defeat backup protection on TRSDOS 6.x disks:
     10 OPEN "R",1,"BOOT/SYS.LSIDOS:0"
     20 GET 1, 3: POKE VARPTR (#1) + 198,0
     30 PUT 1,3: CLOSE: END


TRSDOS 6.x passwords :
for System files           (/SYS)    use LSIDOS
    Filter files           (/FLT)    use FILTER 
    Driver files           (/DVR)    use DRIVER
    Utility files          (/CMD)    use UTILITY
    Basic File             (/CMD)    use BASIC
    Basic Overlays         (/OV$)    use BASIC
    Config files           (/SYS)    use CCC
    Drive code table init  (/DCT)    use UTILITY


Model 4P boot mode key selection (hold key till completed):
    no keys pressed - boots in III mode if MODELA/III on disk
0
    F1      pressed - boots from hard disk
    F2      pressed - boots from floppy disk
    F3      pressed - boots in III mode if MODELA/III on disk
    L       pressed - re-load ROM image (in case of damage)
    N       pressed - boots TRSDOS 6.x (not III's 1.3)
    P       pressed - prompts to switch disks after loading
III ROM
            (press <BREAK> to run III Basic or <ENTER> to
load & run a DOS
    V       pressed - prints ROM version on screen
    .       pressed - performs dynamic RAM test until <RESET>
is presed
    <SHIFT><BREAK>  - boots from RS232. Acts like Network III
Boot ROM


To use LDOS or TRSDOS 6.x to write-protect disks in drive 1:
    From LDOS READY type: SYSTEM (DRIVE=1, WP=Y) (or WP=N to
unprotect.)
    From TRSDOS READY type: WP (DRIVE=1) (or WP to
unprotect.)


To read a Model 4 TRSDOS 6.0 or a Model III LDOS disk
directly on NEWDOS/80 V.2, use this PDRIVE setting:
    TI=A, TD=E, TC=40, SPT=18, TSR=3, GPL=6, DSL=12, DGA=2


To improve the keyboard click on Model 4:
    PATCH CLICK/FLT.FILTER   (D00,7E=04  42:F00,7E=05  00)

To correct the DELETE function of MAILLIST 01.01.00 on TRSDOS
06.01.00 or 06.01.01, change line 1670:
    from    1670 GOSUB 2820: IF REPLY% THEN 2870 ELSE 1760
            180  PRINT @ (12,31),"Version 01.01.00"  'Print
version
    to      1670 GOSUB 2820 IF NOT REPLY% THEN 1760
            180  PRINT @(12,31),"Version 01.01.01"  'Print
version

    PATCH *3 (ADD=4FB7,FIND=EDB0,CHG=0000)


==============================================================
      DOWNLOADED FROM COMPUCENTER BBS (213) 320-0222
==============================================================
 John Mork 02/14/86
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