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2016-04-10T09:33:38Z

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The GRAM format is a headered [[Formats#ROM_dump_formats|ROM dump format]] from the cartridge memory chips, introduced by the TI Gebruikers Groep of Netherlands.

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 8193 bytes long, that is, 1 byte plus the fixed size of a ROM (8K).

{| style="width:60em; text-align:center"
|-
| style="width:4em" |
| style="width:7em" | 0
| style="width:7em" | 1
| style="width:7em" | 2
| style="width:7em" | 3
| style="width:7em" | 4
| style="width:7em" | 5
| style="width:7em" | 6
| style="width:7em" | 7
|-
| 0x00
| style="border: 1px solid black; padding:0.2ex" | Header
| colspan="7" style="border: 1px solid black; padding:0.2ex" | Data
|-
| 0x08
| rowspan="3" colspan="8" style="border: 1px solid black; padding:0.2ex" | Data
|-
| ...
|-
| end
|}

'''Header'''

{| style="width:60em; text-align:center"
|-
| style="width:4em" |
| style="width:7em" | 0
| style="width:7em" | 1
| style="width:7em" | 2
| style="width:7em" | 3
| style="width:7em" | 4
| style="width:7em" | 5
| style="width:7em" | 6
| style="width:7em" | 7
|-
| Bit
| style="border: 1px solid black; padding:0.2ex" | MF
| style="border: 1px solid black; padding:0.2ex" | Type
| colspan="3" style="border: 1px solid black; padding:0.2ex" | ROM Bank
| colspan="3" style="border: 1px solid black; padding:0.2ex" | GROM Bank
|}

'''MF'''

* 1: There are remaining files
* 0: No more files

'''Type'''

* 1: GROM file
* 0: ROM file

'''ROM Bank'''

Three bits to define the bank number.

'''GROM Bank'''

Three bits to define the 8k block in the GROM address space. A value of 3 represents the 8k memory space starting at G>6000.

== Other Headered Dump File Formats ==
* [[GRAM Karte format|GRAM Karte]] (Mechatronic, West-Germany)
* [[GRAM Kracker format |GRAM Kracker]] (Millers Graphics, USA)
* [[Module Simulator format|Module Simulator]] (Texas Instruments)
* [[Memory Image format E/A Module|Memory Image E/A Module]] (Texas Instruments)
* [[Memory Image format Easybug|Memory Image Easybug]] (Texas Instruments)
* [[RAM Module Handler format|RAM Module Handler]] (E.P. Rebel, Netherlands)
* [[DSR RAM Handler format|DSR RAM Handler]] (E.P. Rebel, Netherlands)

[[Category:File Format]]

GRAM Simulator format - Revision history

HackMac: initial content