ES10079 Error in PCjr Technical Reference Manual Color Conn.            
                                                                        
00/00/00                                                                
PCjr Color Display                                 (4863001)            
IBM PCjr System Unit/keyboard                      (4860067)            
Technical Reference                                (1502293)            
                                                                        
The connector  shown on page 3-94 of the Technical Reference            
Manual is  mislabeled.  The  colors  are  shown in the wrong            
order.  The  correct  color  order  is BLUE, RED, INTENSITY,            
GREEN.  These colors correspond with pins 5,3,6, and 4.                 
              *** END OF DOCUMENT  ***                                  
AH10226 How to find out how much memory is on the system                
                                                                        
11/11/85                                                                
BASIC Interpreter by Microsoft                     (6025010)            
                                                                        
KEYWORDS: INFORMATION                                                   
The amount  of  memory  on  the  system unit may be found by            
using the following line:                                               
                                                                        
    10 DEF SEG=0                                                        
    20 MEM=(256*PEEK(&H414))+PEEK(&H413)                                
              *** END OF DOCUMENT  ***                                  
WY10032 Compact Printer Graphics Screen Dumps                           
                                                                        
12/12/85                                                                
PCjr System Unit/Keyboard                 (4860004, 4860067)            
Compact Printer                                    (5181001)            
PCjr Color Display                                 (4863001)            
                                                                        
KEYWORDS: INFORMATION PROBLEM SOLUTION                                  
                                                                        
To allow  the  contents  of  the  PCjr  color  display to be            
printed on an IBM Personal Computer Compact Printer you must            
use Dos  3.0  or above.  Load Graphics.Com with the                     
Compact parameter,  then  you  can  do graphics screen dumps            
using the compact printer.                                              
              *** END OF DOCUMENT  ***                                  
                                                                        
Note :  This modification or recommendation has not been subjected to   
        exhaustive testing and may not, in all circumstances, provide   
        a complete solution.                                            
AH10233 Control-break - example of changing interrupt vector            
                                                                        
11/11/85                                                                
BASIC Interpreter by Microsoft                     (6025010)            
PCjr BASIC (Cartridge)                             (6024101)            
                                                                        
KEYWORDS: INFORMATION                                                   
Following   is  a  program  that  demonstrates  changing  an            
interrupt  vector  from  BASIC.  The vector being changed is            
the Control-break interrupt vector (interrupt number 1B, the            
Keyboard  break  interrupt) located at hex address 6C-6F, or            
decimal   108-111.   The  vector  will  be  changed  to  the            
Dummy_Return   vector,  which   effectively   disables   the            
Control-break   key.  Please  see  the  Technical  Reference            
manual  for  your  system  unit  for  more information about            
interrupt vectors.                                                      
                                                                        
    10 CLS:DEFINT A-I                                                   
    20 DIM A(4)                                                         
    30 DEF SEG=0                                                        
    40 FOR I=1 TO 4                                                     
    50 A(I)=PEEK(107+I) 'Save old interrupt vector                      
    60 NEXT I                                                           
    70 LOCATE 10,18                                                     
    80 PRINT "Press any key to inhibit control-break";                  
    90 A$=INKEY$:IF A$="" THEN GOTO 90                                  
    100 POKE 108,83 'Set to dummy_return vector..                       
    110 POKE 109,255                                                    
    120 POKE 110,0                                                      
    130 POKE 111,18                                                     
    140 LOCATE 15,18                                                    
    150 PRINT "Control-break now inhibited - try it";                   
    160 LOCATE 16,27                                                    
    170 PRINT "(Press spacebar to exit)";                               
    180 A$=INKEY$:IF A$=" " THEN 190 ELSE 180                           
    190 FOR I=1 TO 4                                                    
    200 POKE 107+I,A(I) 'Reset old vector                               
    210 NEXT I                                                          
    220 LOCATE 20,20                                                    
    230 PRINT "Control-break is back on - try it";                      
    240 GOTO 240                                                        
              *** END OF DOCUMENT  ***                                  
TGW0049 PCjr with internal modem and serial printer                     
                                                                        
07/17/85                                                                
PCjr Internal Modem (8600008)                                           
Compact Printer (5181001)                                               
                                                                        
KEYWORDS: PROBLEM SOLUTION INSTALLATION INFORMATION                     
                                                                        
If an Assistant Series  program  is  used on a PCjr that has            
the IBM Internal Modem and the IBM Compact Printer installed            
then option 1  (Select  Printer)  in SETUP is used to select            
printer type "9  Other"  and  COM2:  to  indicate the serial            
printer port is  the  selected  output device.  Use option 2            
(Set up serial  card)  in  SETUP  to  initialize  the serial            
printer port with these parameters:                                     
                                                                        
              Baud Rate = 1200                                          
              Parity    = none                                          
              Data Bits = 8                                             
              Stop Bits = 2                                             
              XON/XOFF  = n                                             
              *** END OF DOCUMENT  ***                                  
EMS0017 REDIRECTION OF LPT1.  PCJR INTERNAL MODEM REDIRECTED            
                                                                        
10/23/85                                                                
IBM PCjr  (4860067)                                                     
                                                                        
A base model PCjr with no internal  modem  and  no  parallel            
printer  adapter  automatically  sends  output  intended for            
LPT1:  to the serial port (for the Compact printer).  Hence,            
the  use  of  the  serial device is transparent to the user.            
This serial port is also COM1:  with no  options  installed.            
If  an  internal  modem  is  installed  the serial port then            
becomes COM2:.  Under these conditions the printer output is            
then  sent  to the COM2:  serial port (the Compact printer).            
This is handled automatically by ROM BIOS.                              
                                                                        
If a  parallel  printer  adapter  is  attached,  the  output            
intended  for the printer is automatically sent to the newly            
attached parallel printer.   To  use  the  Compact  printer,            
output must be redirected to the serial port.                           
                                                                        
     MODE COM1:1200,N,8,2,P                                             
     MODE LPT1:=COM1:                                                   
                                                                        
The  above  two  DOS  commands  work  on  a  PCjr without an            
internal modem.  COM2:  is used when the modem is installed.            
              *** END OF DOCUMENT  ***                                  


            To All Jr Owners:
                 Here is a packet of information I received from IBM's
            main technical support database system. There are a few
            other notes regarding obscure programs on the Jr. like
            Homeword, I didn't bother to include them.
                 There are a few files that are not specific to the jr.
            but they apply anyway.
                 Good luck with your jr's
            
                                Sincerely,
                                
                                Charles Eicher
                                Computerland of Studio City
                                11313 Ventura Blvd
                                Studio City, CA 91602











































EMS0030 PCjr Keyboard scan codes different                              
                                                                        
11/01/83                                                                
IBM PCjr System Unit/keyboard                      (4860067)            
                                                                        
Single character scan codes are identical.                              
                                                                        
The extended scan codes  released  by  the PCjr keyboard are            
slightly different than the PC's. If the Fn key is not                  
released before pressing the f7-10 keys the following is tru            
      **Shift  F9  gives no scan code on the PCjr.                      
      **Ctrl F8, Ctrl F9, and Ctrl F10 give no scan code.               
      **Alt F7 also results in no scan code being released.             
                                                                        
The shift print screen works just like the PC.  The  Control            
Print Screen is replaced by Fn/Echo.                                    
              *** END OF DOCUMENT  ***                                  
JC20024 PCjr Time of Day Clock Gains Time.                              
                                                                        
07/16/85                                                                
IBM PCjr System Unit/keyboard                      (4860067)            
                                                                        
Keywords: Problem Information                                           
                                                                        
The PCjr time of day  clock  gains  time  each  time  a disk            
access is performed.  This  is  a  known BIOS problem and at            
this time a solution has not been reached.                              
              *** END OF DOCUMENT  ***                                  
GB10005 PCjr Serial Port                                                
                                                                        
07/17/85                                                                
UNIT-SYSTEM JR                 (4860067)                                
                                                                        
KEYWORDS: PROBLEM REUUIREMENTS SOLUTION                                 
                                                                        
The maximum  speed  for  the  ASYNC port on the PCjr is 4800            
baud.                                                                   
                                                                        
This  may  make  it difficult to install some serial devices            
unless  the  devices  have  the  capability to adapt to this            
speed.                                                                  
              *** END OF DOCUMENT  ***                                  
GB10007 PCjr Function Key Usage                                         
                                                                        
07/17/85                                                                
IBM PCjr System Unit/keyboard                      (4860067)            
                                                                        
KEYWORDS: INFORMATION PROBLEM SOLUTION                                  
                                                                        
PCjr function keys may appear not to function if the correct            
procedure is  not  followed.  The proper use is to press and            
RELEASE the  Fn  key  before pressing a numeric key.  In the            
case of extended codes the shift or the alt key is held down            
while pressing  and  RELEASING  the  Fn key then while still            
holding the shift or alt key depressed, pressing the numeric            
key. The keyboard definition chart in the PCjr GTO states to            
press and  hold  certain  keys  but  does not say to release            
others.                                                                 
              *** END OF DOCUMENT  ***                                  
JC20007 Use of ALT key to enter extended codes on the PCjr.             
                                                                        
07/17/85                                                                
UNIT-SYSTEM JR                 (4860067)                                
                                                                        
KEYWORDS: INFORMATION PROBLEM                                           
                                                                        
This  document  is  to clarify the use of the ALT key on the            
PCjr  keyboard when entering the extended codes.  When using            
the  ALT  key to enter the extended codes, the keyboard must            
be  in Numeric Lock first.  To put the keyboard into Numeric            
Lock,  hold  ALT and press FN, then N. (This is a toggle, to            
take  the  keyboard  out  of  Numeric  Lock, repeat the same            
procedure.)  Once  the  keyboard is in Numeric Lock, all 256            
extended  codes  may be entered by  holding down the ALT key            
and  then  typing in the numeric value of the extended code.            
See  page 4-9 in the Guide to Operations Personal Computer -            
PCjr manual, PN:1592292.                                                
              *** END OF DOCUMENT  ***                                  
MV10124 Using a PCjr as a terminal on XENIX                             
                                                                        
07/20/85                                                                
PC XENIX OPERATING SYSTEM      (6024207)                                
UNIT-SYSTEM JR                 (4860067)                                
KEYWORDS: INFORMATION SOLUTION INSTALLATION REQUIREMENTS                
                                                                        
A PCjr can easily be attached to a system running XENIX as a            
"dumb"  terminal.  A  PCjr  is  a  good  choice  because  in            
addition to its use  as a terminal, it can also be used as a            
stand alone computer.                                                   
                                                                        
For  relatively low cost, a user can have both a terminal               
and a powerful computer.                                                
              *** END OF DOCUMENT  ***                                  
DLE0026 Non-Maskable Interrupt problem in DOS 2.1                       
                                                                        
08/02/85                                                                
IBM PCjr System Unit/keyboard                      (4860067)            
DOS Disk Operating System Ver. 2.0 (6024061) & 2.1 (6024120)            
                                                                        
                                                                        
KEYWORDS:  PROBLEM INFORMATION UPDATE                                   
                                                                        
There is a problem in DOS 2.1 that may  manifest  itself  by            
hanging  the system after a keystroke in any application and            
will be restricted mainly to the PCjr.                                  
                                                                        
A  patch  to  correct  the  problem  is available on the DOS            
1.1/2.0/2.1  PATCH  Diskette.  This diskette is available on            
request from the Dealer Support Center.                                 
              *** END OF DOCUMENT  ***                                  
RS10026 Program Languge Compilers on the PCjr                           
                                                                        
08/07/85                                                                
FORTRAN Compiler Version 1.0                       (6024012)            
Pascal Compiler Version 1.0                        (6024010)            
IBM PCjr System Unit/keyboard                      (4860067)            
FORTRAN Compiler Version 2.0                       (6024127)            
Pascal Compiler Version 2.0                        (6024128)            
                                                                        
                                                                        
KEYWORDS: INFORMATION INSTALLATION REQUIREMENTS                         
                                                                        
Yes,  the language  compilers  can run on the IBM PCjr.  You            
must  take  several  factors  into consideration.  Lets list            
these first.                                                            
                                                                        
1.  Both  of the version 2.0  compilers  require  160KB  of             
memory for DOS 2.0 and 190KB for later versions of DOS.                 
                                                                        
2. Both of the version 2.0  compilers  require  two diskette            
drives.                                                                 
                                                                        
The IBM Software Guide(dated September 1984) stipulates that            
the  above  compilers "Needs extended memory with the PCjr".            
If  you  look  at the MINIMUM SYSTEM REQUIREMENTS section of            
the  same  brochure,  the FORTRAN, and PASCAL entries states            
that  the  IBM PCjr requires 512KB to apportion between user            
memory and RAM disk".                                                   
                                                                        
The  512K  breaks  down  as follows:  approximately 32KB for            
DOS,  16KB  for  Video  Buffer,  160KB  for  the  particular            
compiler,  and  314KB  for  a  RAM disk.  In this manner the            
requirements   are   met,  and  the  compiler  will  execute            
properly.                                                               
              *** END OF DOCUMENT  ***                                  
EF10144 Screen intensity                                                
                                                                        
09/05/85                                                                
IBM PCjr BASIC (with Cartridge)  Version 1.0       (6024101)            
IBM PCjr System Unit/keyboard                      (4860067)            
                                                                        
KEYWORDS: INFORMATION                                                   
                                                                        
ThePCjr  provides  for full contrast/brightness on all types            
of monitors  when  it  is running with DOS 2.1 but, when the            
machine goes  into  BASIC  either directly or via a program,            
the  screen  intensity  drops to approximately half.  On the            
display,  full gain on contrast and brightness controls does            
not allow  you  to regain a normal brightness.  This is true            
in Cassette or cartridge BASIC.  The intensity is  purposely            
dimmed so  that  it  does  not overdrive an RGB or composite            
monitor.  To  get  full  brightness on the display enter the            
following BASIC statement:                                              
                                                                        
    Screen 1,0                                                          
                                                                        
This statement will set your screen  to high intensity.                 
                                                                        
              *** END OF DOCUMENT  ***                                  
JC20006 PCjr Cartridge Basic Screen Mode 5 or 6                         
                                                                        
10/11/85                                                                
IBM PCjr BASIC (with Cartridge)  Version 1.0       (6024101)            
IBM PCjr System Unit/keyboard                      (4860067)            
PCjr Power Expansion Attachment                    (8600006)            
                                                                        
                                                                        
KEYWORDS: PROBLEM SOLUTION INFORMATION                                  
                                                                        
Basic  Statement,  SCREEN,  Modes  5  or  6 are supported in            
Cartridge  Basic  only  and  require  a  minimum  of 128K of            
memory.   If   you  have  not  issued  the  Basic  Statement            
CLEAR,,,32768  prior  to  issuing  SCREEN,  Mode  5 or 6, an            
Illegal  Function  Call  will  result.  See  Basic  Personal            
Computer  -  PCjr  Manual (6024101), for the CLEAR statement            
and for the  SCREEN statement.                                          
              *** END OF DOCUMENT  ***                                  
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