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-rw-r--r--src/devices/bus/a800/atari810.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/devices/bus/a800/atari810.cpp b/src/devices/bus/a800/atari810.cpp
index 6967d641753..69b5bd09d2f 100644
--- a/src/devices/bus/a800/atari810.cpp
+++ b/src/devices/bus/a800/atari810.cpp
@@ -4,6 +4,14 @@
Atari 810 Disk Drive
+ The 810 is the original 5ΒΌ" floppy disk interface for the Atari 400/800
+ computer, supporting only a 709-sector single density format.
+
+ The built-in drive mechanism uses a four-phase stepper motor which is
+ controlled by outputs to a PIA port rather than by the WD1771-01 FDC.
+ The PIA also generates a synthetic index pulse for the FDC. (The format
+ defines the undersized 19th sector of each track as the index area.)
+
***************************************************************************/
#include "emu.h"