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DevelopmentSega Master System / Mark III / Game Gear |
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Tape Format
Supplementary Chart 12. Format for Recording on Cassette Tape
Representation of 1 bit
Bit "1" (2 cycles of 2400 Hz)
Bit "0" (1 cycle of 1200 Hz)
Representation of 1 byte
Example For 1-byte data, 27H
| Start bit | BIT0 | BIT1 | BIT2 | BIT3 | BIT4 | BIT5 | BIT6 | BIT7 | STOP BIT | |
|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 1 |
| | | | | | | | | | |
General format
| Leader field | 3600 records of bit 1 |
|---|---|
| Data portion | A collection of byte data |
Format for save of text
| Unrecorded field (10 sec) | ||
|---|---|---|
| Leader field | Header portion | |
| Key code 16H | 1 bytes | For identification of header portion of BASIC text |
| File name * | 16 bytes | 16 char. max. A shorter name is followed by spaces to fill 16 positions. |
| Program length, n * | 2 bytes | 16-bit binary little-endian |
| Parity | 1 bytes | Two’s complement of sum of data in asterisked ranges |
| Dummy data | 2 bytes | For prevention of overread |
| Unrecorded field (1 sec) | ||
| Leader field | Data portion | |
| Key code 17H | 1 bytes | For identification of data field of BASIC text |
| Program * | n bytes | Contents of text area |
| Parity | 1 bytes | Two’s complement of sum of data in asterisked ranges |
| Dummy data | 2 bytes | For prevention of overread |
Format for save of machine language program
| Unrecorded field (10 sec) | ||
|---|---|---|
| Leader field | Header portion | |
| Key code 26H | 1 bytes | For identification of header portion of machine language program |
| File name * | 16 bytes | 16 char. max. A shorter name is followed by spaces to fill 16 positions. |
| Program length, n * | 2 bytes | 16-bit binary little-endian |
| Start address * | 2 bytes | 16-bit binary little-endian |
| Parity | 1 bytes | Two's complement of sum of data in asterisked ranges |
| Dummy data | 2 bytes | For prevention of overread |
| Unrecorded field (1 sec) | ||
| Leader field | Data portion | |
| Key code 27H | 1 bytes | For identification of data of machine language program |
| Program * | n bytes | Memory contents |
| Parity | 1 bytes | Two’s complement of sum of data in asterisked ranges |
| Dummy data | 2 bytes | For prevention of overread |
