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-rw-r--r--src/devices/machine/am9513.cpp8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/devices/machine/am9513.cpp b/src/devices/machine/am9513.cpp
index 1e572647e15..f41711fbfcd 100644
--- a/src/devices/machine/am9513.cpp
+++ b/src/devices/machine/am9513.cpp
@@ -6,8 +6,12 @@
The Am9513 is a five-channel counter/timer circuit introduced by
AMD around 1980. (It was also sold as the AmZ8073, apparently due
- to a licensing deal with Zilog.) Clock source, edge selection,
- gating and retriggering are programmable for each channel.
+ to a licensing deal with Zilog to develop Z8000 peripherals. No
+ company is known to have second-sourced the device, however.)
+ Clock source, edge selection, gating and retriggering are
+ programmable for each channel. There is also a frequency divider
+ which can take any of the 15 normal counter inputs and divide it
+ by any number between 1 and 16.
All internal counters are 16 bits wide (except the internal 4-bit
counter for the FOUT divider, which is not externally accessible).