diff options
author | Vas Crabb <vas@vastheman.com> | 2018-08-15 16:24:48 +1000 |
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committer | Vas Crabb <vas@vastheman.com> | 2018-08-15 16:24:48 +1000 |
commit | 2d35a2545cdd1503b60bcdcf19874886975465fd (patch) | |
tree | 099aa2587f14ec52cb6066072bfa5febe8c63985 | |
parent | 84a46d14b76ee907ab2bfc4d89ced51d28bced64 (diff) |
add notes about other A2000 keyboard variants (nw)
-rw-r--r-- | src/devices/bus/amiga/keyboard/a2000.cpp | 14 |
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" |