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Subject: Equity le - Lotus 1 - 2- 3 Graph Patch Program

Date: 6/26/90

Page:

1 of 1

When using Lotus 1 - 2- 3 (ver. 2.01) with the Hercules Monochrome board

or an Epson MGA board set for monochrome mode, the system displays

garbage (usually a checker board pattern) when using graphics. This also

occurs if the 90 x 25 text mode is selected in the Lotus INSTALL program,

since Hercules graphics mode is utilized.

The solution for this problem is to disable the internal MCGA video by

creating and using the program listed below. Run the MS - DOS supplied

DEBUG program and type in the following:

- A

xxxx:0100 in AL,65 ;

xxxx:0102 and AL,FB ;

xxxx:0104 out 65,AL ;

xxx"0106 int 20

xxxx:0108

-NMCGADIS.COM ;

-RCX

CX 0000

- W

Writing 0008 bytes '

- Q

Note: xxxx segment value will vary depending on system memory usage.

The MCGADIS.COM program can now be found in the current directory. It can

be added to the AUTOEXEC.BAT file or run directly, before running Lotus.

This program will enable a Hercules Monochrome board or Epson MGA board

to be used in monochrome mode, but will not allow a CGA card to be used.

Product Support Bulletin

Comments only - do not type in

Get current value of equipment enable register.

Clear video enable bit to disable MCGA.

Output new value to the equipment enable register.

;

End of program.

Press <Enter> key here.

Specify name of program as "MCGADIS.COM".

Edit CX register.

Currently contains 0000.

Specify 8 bytes to be saved.

Save program to disk.

Quit DEBUG.

PSB No: S-0121