DS1210
Nonvolatile SRAM controller chip.
TOL selects power-fail VCC level, based on 5% tolerance when 0 or 10% tolerance when 1.
+---+--+---+ +---+----*---+
VCCo |1 +--+ 8| VCC |/EN|VCC |/Y |
VBAT1 |2 DS 7| VBAT2 +===+====*===+
TOL |3 1210 6| /Y | 1 | OK | 1 |
GND |4 5| /EN | 0 | OK | 0 |
+----------+ | X | LO | 1 |
+---+----*---+

DS1211
1-of-8 inverting decoder/nonvolatile SRAM controller chip.
TOL selects power-fail VCC level, based on 5% tolerance when 0 or 10% tolerance when 1. The Dallas Semi data book suggests this is actually a repackaged DS1212.
+---+--+---+ +---+---+---+---+----*---+---+---+---+---+
VBAT1 |1 +--+ 20| VCC |/EN| S2| S1| S0|VCC |/Y0|/Y1|...|/Y7|/PF|
VCCo |2 19| VBAT2 +===+===+===+===+====*===+===+===+===+===+
TOL |3 18| /EN | X | X | X | X | LO | 1 | 1 | 1 | 1 | 0 |
/PF |4 17| /Y0 | 1 | 0 | 0 | 0 | OK | 0 | 1 | 1 | 1 | 1 |
/Y7 |5 DS 16| /Y1 | 0 | 0 | 0 | 1 | OK | 1 | 0 | 1 | 1 | 1 |
/Y6 |6 1211 15| /Y2 | 0 | . | . | . | OK | 1 | 1 | . | 1 | 1 |
S2 |7 14| /Y3 | 0 | 1 | 1 | 1 | OK | 1 | 1 | 1 | 0 | 1 |
S1 |8 13| +---+---+---+---+----*---+---+---+---+---+
S0 |9 12| /Y4
GND |10 11| /Y5
+----------+

DS1212
1-of-16 inverting decoder/nonvolatile SRAM controller chip.
TOL selects power-fail VCC level, based on 5% tolerance when 0 or 10% tolerance when 1.
+-----+--+-----+ +---+---+---+---+---+----*---+---+---+----+---+
VBAT1 |1 +--+ 28| VCC |/EN| S3| S2| S1| S0|VCC |/Y0|/Y1|...|/Y15|/PF|
VCCo |2 27| VBAT2 +===+===+===+===+===+====*===+===+===+====+===+
TOL |3 26| /EN | X | X | X | X | X | LO | 1 | 1 | 1 | 1 | 0 |
/PF |4 25| /Y0 | 1 | 0 | 0 | 0 | 0 | OK | 0 | 1 | 1 | 1 | 1 |
/Y15 |5 24| /Y1 | 0 | 0 | 0 | 0 | 1 | OK | 1 | 0 | 1 | 1 | 1 |
/Y14 |6 23| /Y2 | 0 | . | . | . | . | OK | 1 | 1 | . | 1 | 1 |
/Y13 |7 DS 22| /Y3 | 0 | 1 | 1 | 1 | 1 | OK | 1 | 1 | 1 | 0 | 1 |
/Y12 |8 1212 21| /Y4 +---+---+---+---+---+----*---+---+---+----+---+
/Y11 |9 20| /Y5
S3 |10 19| /Y6
S2 |11 18| /Y7
S1 |12 17| /Y8
S0 |13 16| /Y9
GND |14 15| /Y10
+--------------+

DS1285, DS1287, DS1287A
Real-time clock with 50 bytes RAM.
DS1287(A) has built-in quartz crystal and lihium battery, and therefore the X1, X2 and VBAT pins are no-connect. On the (older) DS1287 the /RCLR pin is no-connect as well.
+-----+--+-----+
MOT |1 +--+ 24| VCC
X1 |2 23| SQW
X2 |3 22|
AD0 |4 21| /RCLR
AD1 |5 20| VBAT
AD2 |6 DS1285 19| /INT
AD3 |7 18| /RST
AD4 |8 17| DS
AD5 |9 16| GND
AD6 |10 15| R//W
AD7 |11 14| AS
GND |12 13| /CE
+--------------+

Z16C30
Dual universal serial controller.
PLCC68
+---------------+---------------+---------------+---------------+
| 10 /RxACKA | 27 /TxREQA | 44 /RxREQB | 61 /TxACKB |
| 11 /INTA | 28 /RxCA | 45 VCC | 62 /PITACK |
| 12 IEIA | 29 RxDA | 46 GND | 63 R//W |
| 13 IEOA | 30 /DCDA | 47 AD15 | 64 /WR |
| 14 GND | 31 /TxCA | 48 AD14 | 65 /RD |
| 15 VCC | 32 TxDA | 49 AD13 | 66 /DS |
| 16 AD0 | 33 /CTSA | 50 AD12 | 67 /AS |
| 17 AD1 | 34 GND | 51 AD11 | 68 VCC |
| 18 AD2 | 35 GND | 52 AD10 | 1 VCC |
| 19 AD3 | 36 GND | 53 AD9 | 2 VCC |
| 20 AD4 | 37 /CTSB | 54 AD8 | 3 /RST |
| 21 AD5 | 38 TxDB | 55 VCC | 4 /CE&n