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author AJR <ajrhacker@users.noreply.github.com>2016-09-07 22:56:28 -0400
committer AJR <ajrhacker@users.noreply.github.com>2016-09-07 22:56:28 -0400
commit9009021c8e7de61ecb22cf31af0f3b248c242b03 (patch)
tree39c710e39a2bd31138edfb28a0c43692e2346891 /src/mame/drivers/amusco.cpp
parent6dcfe97f718ef864bcaa477ddd05404f9a26431f (diff)
amusco.cpp: Hardware notes (nw)
Diffstat (limited to 'src/mame/drivers/amusco.cpp')
-rw-r--r--src/mame/drivers/amusco.cpp9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/mame/drivers/amusco.cpp b/src/mame/drivers/amusco.cpp
index 17c9ba4ee27..e7d8ef6ffe0 100644
--- a/src/mame/drivers/amusco.cpp
+++ b/src/mame/drivers/amusco.cpp
@@ -41,6 +41,15 @@
22.1184 MHz. Crystal
15.000 MHz. Crystal
+ An unidentified but similar Amusco PCB auctioned on eBay had an AMD P8088 filling the
+ CPU socket. Some of the other chips on this board were replaced with clones (e.g.
+ AMD P8253, SY6545-1).
+
+ The program code reads from and writes to what must be a line printer and a RTC
+ (probably a MSM5832), though neither is present on the main board. The I/O write
+ patterns also suggest that each or both of these devices are accessed through an
+ unknown interface chip or gate array (not i8255-compatible).
+
*****************************************************************************************
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