sda4: commit the Glaze developer hard-drive dump

Un-ignored: the dev drive is the ground truth the restoration and
emulator work constantly reference (DPL3/LIBDPL + VRENDER i860 renderer
source, BT/RP live+dev game trees, VGL_LABS pod boot, scene/audio
content). Kept in-repo for the pod-owner community.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

sda4/DPL3/LINKIO.H

@@ -0,0 +1,45 @@
+/*
+    FILE    : LINKIO.H
+    PROJECT : dView
+    Author  : Phil Atkin
+
+
+    (C) Division Ltd 1991 / 1992.
+    
+    Header file for linkio.c
+    low-level driver interface for transputer links / link adapters
+
+*/
+
+#ifndef linkio_h
+#define linkio_h
+
+#include "basictyp.h"
+
+#ifdef UNIX 
+extern void initLA (char *);
+#else
+extern void initLA (void);
+#endif
+
+#define link_io_error __connected=0; printf
+#define link_io_ABORTCHECK if (__connected == 0) goto abort
+#define link_io_EXITZERO   abort: return 0
+#define link_io_EXIT       abort: return
+
+extern int32 __connected;
+
+extern void linkio_error ( char* );
+
+extern void setLA ( int );
+extern void reset(void);
+extern int32 outputOrFail ( unsigned char b);
+extern int32 inputOrFail ( unsigned char *b);
+extern int32 inputReady(void);
+extern int32 altRecord (void);
+
+extern int32 outRecord(char *packet, int32 bytes );
+extern int32 inRecord(char *packet, int32 bytes );
+extern int32 fifo_ok_status(void);
+
+#endif