Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-07-04 17:38:08 +03:00
Code Issues Actions 36 Packages Projects Releases Wiki Activity

add notes about other A2000 keyboard variants (nw)

Browse Source
This commit is contained in:
Vas Crabb 2018-08-15 16:24:48 +10:00
parent 84a46d14b7
commit 2d35a2545c
1 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/devices/bus/amiga/keyboard/a2000.cpp
View File

@ -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"