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author Vas Crabb <vas@vastheman.com>2018-08-15 16:24:48 +1000
committer Vas Crabb <vas@vastheman.com>2018-08-15 16:24:48 +1000
commit2d35a2545cdd1503b60bcdcf19874886975465fd (patch)
tree099aa2587f14ec52cb6066072bfa5febe8c63985
parent84a46d14b76ee907ab2bfc4d89ced51d28bced64 (diff)
add notes about other A2000 keyboard variants (nw)
-rw-r--r--src/devices/bus/amiga/keyboard/a2000.cpp14
1 files changed, 12 insertions, 2 deletions
diff --git a/src/devices/bus/amiga/keyboard/a2000.cpp b/src/devices/bus/amiga/keyboard/a2000.cpp
index 4479deab8f5..b8739807889 100644
--- a/src/devices/bus/amiga/keyboard/a2000.cpp
+++ b/src/devices/bus/amiga/keyboard/a2000.cpp
@@ -4,9 +4,9 @@
Amiga 2000 Keyboard
- Manufactured by Cherry
+ Manufactured by Cherry (G80 series)
- Very simple electronics:
+ Very simple electronics (parts from dumped German variant):
* Philips crystal labelled 6000.000
* U1 Philips MAB 8039HL 11P (microcontroller)
* U2 RCA CD74HCT373E (latches low address bits from data bus)
@@ -28,11 +28,21 @@
populated). The program reads keys using movx a,@r0 when running
from external ROM, or ins a,bus when running from internal ROM.
+ German and Swedish variants have been seen with the same 467 label
+ on the external EPROM. The Swedish variant uses the same buffers
+ at U2 and U3, but has a Mitsubishi M5L8039P-11 microcontroller at
+ U1.
+
Photos of a Swedish variant with a Philips MAB 8049H P A198 at U1,
and U2, U3 and U4 unpopulated have been posted on forums. The
internal ROM of this single-chip version needs to be dumped for
verification.
+ The later cost-reduced Amiga 2000 keyboard manufactured by Mitsumi
+ uses different electronics. It has a MOS 6570-036 MCU with a
+ ceramic resonator, a TI SN74HC00N, and a Hitachi HD74HC123AP. The
+ header for the host connection has four positions and pins.
+
***************************************************************************/
#include "emu.h"