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author Michaël Banaan Ananas <happppp@users.noreply.github.com>2014-10-06 16:02:37 +0000
committer Michaël Banaan Ananas <happppp@users.noreply.github.com>2014-10-06 16:02:37 +0000
commit53e61f61711e0793faae065a06782f928f3c6dec (patch)
treea846cf13aa4ee08a246cd20230ae4e46b757fdab /src/emu/machine/pit8253.h
parent9f5fc08a1b4070ea1ae99dc04c596b5db49e7808 (diff)
upon reading datasheet further, it became obvious that uPD71054 == 82C54
Diffstat (limited to 'src/emu/machine/pit8253.h')
-rw-r--r--src/emu/machine/pit8253.h22
1 files changed, 21 insertions, 1 deletions
diff --git a/src/emu/machine/pit8253.h b/src/emu/machine/pit8253.h
index 3f736926b42..aa3997d4766 100644
--- a/src/emu/machine/pit8253.h
+++ b/src/emu/machine/pit8253.h
@@ -11,13 +11,33 @@
D4 4 | | 21 _CS
D3 5 | | 20 A1
D2 6 | 8253 | 19 A0
- D1 7 | | 18 CLK2
+ D1 7 | 8254 | 18 CLK2
D0 8 | | 17 OUT2
CLK0 9 | | 16 GATE2
OUT0 10 | | 15 CLK1
GATE0 11 | | 14 GATE1
GND 12 |_____________| 13 OUT1
+
+**********************************************************************
+ _____ _____
+ D7 <-> 1 |* \_/ | 24 --- Vdd
+ D6 <-> 2 | | 23 <-- _WR
+ D5 <-> 3 | | 22 <-- _RD
+ D4 <-> 4 | | 21 <-- _CS
+ D3 <-> 5 | | 20 <-- A1
+ D2 <-> 6 | uPD71054C | 19 <-- A0
+ D1 <-> 7 | | 18 <-- CLK2
+ D0 <-> 8 | | 17 --> OUT2
+ CLK0 --> 9 | | 16 <-- GATE2
+ OUT0 <-- 10 | | 15 <-- CLK1
+ GATE0 --> 11 | | 14 <-- GATE1
+ GND --- 12 |_____________| 13 --> OUT1
+
+ uPD71054C (8MHz), uPD71054C-10 (10MHz) - it is a clone of Intel 82C54
+ also available in 28-pin QFP and 44-pin PLCC (many pins NC)
+
+
***************************************************************************/
#ifndef __PIT8253_H__