ZX Interface 1: Difference between revisions

ZX Interface 1 (view source)

283 bytes added , 7 January 2023

90

edits

@@ Line 216: / Line 216: @@
 | 00H || 0x03 || File Type. 00=Basic Program, 01=Numeric Array, 02=Character Array, 03=CODE Function.
 |-
-| 01H-02H || 0x00, 0x02H || Record Length 0x0200H bytes ( 512 Bytes )
+| 01H-02H || 0x00, 0x02H || File Length (0x0200H bytes = 512 Bytes )
 |-
-| 03H-04H || 0x40, 0x09C || Place to load this in memory ( Place it was saved from )
+| 03H-04H || 0x40, 0x9CH || Place it was saved from (Used for code only, but populated for all file types)
 |-
-| 05H-08H || 0xFF, 0xFF, 0xFF, 0xFF || Unusued at this time. Reserved.
+| 05H-06H || 0xFF, 0xFFH  ||* BASIC: start of variables area in file.
+* Numeric arrays: [5] = 0x80 + (variable name - 'A')
+* Char array: [5] =  0xC0 + (variable name - 'A')
+* Code: Unused (Should be FFh FFh)
+|-
+| 07H-08H || 0xFF, 0xFF || For BASIC, Autorun line no (lsb first, 0x00 0x80 = No autorun), $FF for all other file types.
 |-
 | 09H-01FFH || 0x00, 0x01, 0x02, 0x04 etc... to 0xFF || The first 503 bytes of actual saved data. Anything more than this gets saved in the next sector.