AMSTRAD cpc 6128 Manuel d'utilisateur télécharger pdf (Page 66)

The Amstrad CPC Firmware Guide

Notes This routine cannot be used once CAS OUT CHAR has been used

Disc All the above applies to the disc routine

&BC9B *CAS CATALOG

Action Creates a catalogue of all the files on the tape

Entry DE contains the address of the 2K buffer to be used to store the information

Exit

If the operation was successful, then Carry is true, Zero is false, and A is corrupt; if the read stream is

already being used, then Carry and Zero are false, and A holds an error code (664/6128 or is corrupt

(for the 464); in all cases, BC, DE, HL, IX and the other flags are corrupt and all others are preserved

Notes

This routine is only left when the ESC key is pressed (cassette only) and is identical to BASIC's CAT

command

Disc

All tbe above applies, except that a sorted list of files is displayed; system files are not listed by this

routine

&BC9E CAS WRITE

Action Writes data to the tape in one long file (ie not in 2K blocks)

Entry

HL contains the address of the data to be written to tape, DE contains the length of the data to be

written, and A contains the sync character

Exit

If the operation was successful, then Carry is true and A is corrupt; if an error occurred then Carry is

false and A contains an error code; in both cases, BC, DE, HL and lX are corrupt, and all other registers

are preserved

Notes

For header records the sync character is &2C, and for data it is &16; this routine starts and stops the

cassette motor and also tums off interrupts whilst writing data

&BCA1 CAS READ

Action Reads data from the tape in one long file (ie as originally written by CAS WRITE only)

Entry

HL holds the address to place the file, DE holds the length of the data, and A holds the expected sync

character

Exit

If the operation was successful, then Carry is true and A is corrupt; if an error occurred then Carry is

false and A contains an error code; in both cases, BC, DE, HL and IX are corrupt, and all other registers

are preserved

Notes

For header records the sync character is &2C, and for data it is &16; this routine starts and stops the

cassette motor and turns off interrupts whilst reading data

&BCA4 CAS CHECK

Action Compares the contents of memory with a file record (ie header or data) on tape

Entry

HL contains the address of the data to check, DE contains the length of the data and A holds the sync

character that was used when the file was originally written to the tape

Exit

If the two are identical, then Carry is true and A is corrupt; if an error occurred then Carry is false and A

holds an error code; in all cases, BC, DE, HL, IX and other flags are corrupt, and all other registers are

preserved

Notes

For header records the sync character is &2C, and for data it is &16; this routine starts and stops the

cassette motor and turns off interrupts whilst reading data; does not have to read the whole of a record,

but must start at the beginning

AMSDOS and BIOS Firmware

&C033 BIOS SET MESSAGE

Action Enables or disables disc error messages

Entry To enable messages, A holds &00; to disable messages, A holds &FF

Exit A holds the previous state, HL and the flags are corrupt, and all others are preserved

Notes Enabling and disabling the messages can also be achieved by poking &BE78 with &00 or &FF

&C036 BIOS SETUP DISC

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 104 105

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AMSTRAD cpc 6128 Manuel d'utilisateur Page 66

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