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Merge pull request #1378 from ajrhacker/amusco_notes

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amusco.cpp: Hardware notes (nw)
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Vas Crabb 2016-09-08 13:48:52 +10:00 committed by GitHub
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src/mame/drivers/amusco.cpp
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@ -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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