From 2d04cacc5322951f187bb17e017c12920ac8ebe2 Mon Sep 17 00:00:00 2001
From: Mark Zbikowski
Date: Thu, 25 Apr 2024 21:24:10 +0100
Subject: MZ is back!

---
 v4.0/src/DEV/SMARTDRV/DIRENT.ASM | 56 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 v4.0/src/DEV/SMARTDRV/DIRENT.ASM

(limited to 'v4.0/src/DEV/SMARTDRV/DIRENT.ASM')

diff --git a/v4.0/src/DEV/SMARTDRV/DIRENT.ASM b/v4.0/src/DEV/SMARTDRV/DIRENT.ASM
new file mode 100644
index 0000000..e7150c8
--- /dev/null
+++ b/v4.0/src/DEV/SMARTDRV/DIRENT.ASM
@@ -0,0 +1,56 @@
+Break <Directory entry>
+
+;
+;	+---------------------------+
+;	|  (12 BYTE) filename/ext   |	    0	    0
+;	+---------------------------+
+;	|     (BYTE) attributes     |	    11	    B
+;	+---------------------------+
+;	|    (10 BYTE) reserved     |	    12	    C
+;	+---------------------------+
+;	| (WORD) time of last write |	    22	    16
+;	+---------------------------+
+;	| (WORD) date of last write |	    24	    18
+;	+---------------------------+
+;	|   (WORD) First cluster    |	    26	    1A
+;	+---------------------------+
+;	|     (DWORD) file size     |	    28	    1C
+;	+---------------------------+
+;
+;   First byte of filename  = E5 -> free directory entry
+;			    = 00 -> end of allocated directory
+;   Time:   Bits 0-4=seconds/2, bits 5-10=minute, 11-15=hour
+;   Date:   Bits 0-4=day, bits 5-8=month, bits 9-15=year-1980
+;
+
+dir_entry   STRUC
+dir_name    DB	    11 DUP (?)		; file name
+dir_attr    DB	    ?			; attribute bits
+dir_pad     DB	    10 DUP (?)		; reserved for expansion
+dir_time    DW	    ?			; time of last write
+dir_date    DW	    ?			; date of last write
+dir_first   DW	    ?			; first allocation unit of file
+dir_size_l  DW	    ?			; low 16 bits of file size
+dir_size_h  DW	    ?			; high 16 bits of file size
+dir_entry   ENDS
+
+attr_read_only	    EQU      1h
+attr_hidden	    EQU      2h
+attr_system	    EQU      4h
+attr_volume_id	    EQU      8h
+attr_directory	    EQU     10h
+attr_archive	    EQU     20h
+attr_device	    EQU     40h 	; This is a VERY special bit.
+					;   NO directory entry on a disk EVER
+					;   has this bit set. It is set non-zero
+					;   when a device is found by GETPATH
+
+attr_all	    EQU     attr_hidden+attr_system+attr_directory
+					; OR of hard attributes for FINDENTRY
+
+attr_ignore	    EQU     attr_read_only+attr_archive+attr_device
+					; ignore this(ese) attribute(s) during
+					; search first/next
+
+attr_changeable     EQU     attr_read_only+attr_hidden+attr_system+attr_archive
+					; changeable via CHMOD
-- 
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