GRAM Karte format

The GRAM format is a headered ROM dump format from the cartridge memory chips, introduced by Mechatronic in West-Germany.

The contents of these files are taken from the ROMs and GROMs of the cartridge, so there must be meta-data about the origin of the data. In fact, these files are commonly 8198 bytes long, that is, 6 bytes plus the common size of a ROM (8K).

	0	1	2	3	4	5	6	7
0x00	Type		Address		Length		Data
0x08	Data
...
end

Type

• A5A5 indicates a GROM file
• 5A5A indicates a ROM file

Address

• For GROM it is the start address where data is loaded from
• For ROM it is a bank access address (>6000 - ROM >6000, >6002 - ROM >7000 bank 2, >6004 - ROM >7000 bank 3)

Length

This word specifies the length of data. File size should be the sum of the header size (6 bytes) plus the length of data. If the file is larger, only the given length of data is used.

Other Headered Dump File Formats

• GRAM Kracker (Millers Graphics, West-Germany)
• GRAM Simulator (TI Gebruikers Groep, Netherlands)
• Module Simulator (Texas Instruments)
• Memory Image E/A Module (Texas Instruments)
• Memory Image Easybug (Texas Instruments)
• RAM Module Handler (E.P. Rebel, Netherlands)
• DSR RAM Handler (E.P. Rebel, Netherlands)