The handling of the UNI64 USB DATA Writer is very simple. Depending on
which file size is to be written, a certain EEPROM type is needed:
| AT28C64 | 8KB |
| AT28C256 | 32KB |
| W27C512 | 64KB |
Procedure using the example of an EEPROM for the uHeld64. The following EEPROM memory allocation is required for the uHELD64:
| BASIC | 8KB |
| KERNEL | 8KB |
| CHARS | 4KB |
| CHARS | 4KB |
| CHARS | 4KB |
| CHARS | 4KB |
Thus, 6 "DROP ROM" memory locations are required at the top of the list. To do this, press the "+" symbol 5 times.
Then the 6 necessary files are placed in the 6 DROP fields on the "DROP ROM" fields (it is also possible to place only 1 ROM that is 32KB in size, if a separate 32KB ROM has been prepared by yourself)
Now an AT28C256 EEPROM is placed into the "USB DATA WRITER" and the write process is started with the "WRITE to EPROM" button.
Then the LED of the USB DATA WRITER flashes briefly (1x = AT28C64, 2x = AT28C256, 3x = W27C512, 10x = Error!), and then again continuously for as long as the write process takes. When the LED goes out, the write process is completed and the EPROM can be removed and used.
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