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add notes about other A2000 keyboard variants (nw)

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Vas Crabb 2018-08-15 16:24:48 +10:00
parent 84a46d14b7
commit 2d35a2545c
1 changed files with 12 additions and 2 deletions
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14
src/devices/bus/amiga/keyboard/a2000.cpp
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@ -4,9 +4,9 @@
Amiga 2000 Keyboard 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 * Philips crystal labelled 6000.000
* U1 Philips MAB 8039HL 11P (microcontroller) * U1 Philips MAB 8039HL 11P (microcontroller)
* U2 RCA CD74HCT373E (latches low address bits from data bus) * 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 populated). The program reads keys using movx a,@r0 when running
from external ROM, or ins a,bus when running from internal ROM. 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, 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 and U2, U3 and U4 unpopulated have been posted on forums. The
internal ROM of this single-chip version needs to be dumped for internal ROM of this single-chip version needs to be dumped for
verification. 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" #include "emu.h"