Nascom Newsletter |
Volume 3, Number 1 – April 1983 |
|
|
|
Page 5 of 37 |
|
|
|
---|
For those of you with an EPROM blower wanting to create your own set of characters, the accompanying program will allow you to easily create, change and amend each character cell. It is written in machine code and will run under Nas-Sys.
As most of you are already aware, each character cell for the N1 is made up of 16 rows of 8 dots whereas for the N2 it is 14 rows of 8 dots, the last two rows being unused by the N2. As there are 128 characters in a character EPROM, the EPROM must be 16 x 128 bytes, ie. 2K. On executing the program you will be asked whether you are programming an N1 or N2 EPROM followed by the origin of the 2K of RAM where the characters will be stored. Characters are produced by using the commands listed below and storing them an tape ready for blowing into EPROM. (NB the origin must be above 1700H)
|
|
|
Page 5 of 37 |
|
|
|
---|