Newton Interconnect Port Hardware Specification

The Newton Interconnect Port Hardware Specification for the MessagePad is Apple Computer's 14-page draft specification of the 26-pin InterConnect port on the MessagePad 2000 and 2100, dated 13 August 1997 and marked "Draft. Preliminary".

Contents

• Overview of the pin groups (p. 1-1)
• Serial channel 0, through an LTC1323 line driver at RS-422 levels, and serial channel 3, with no line driver (pp. 1-2 to 1-4); the connection to a standard Apple DIN 8 serial cable (Table 1-1)
• Audio out and audio in (pp. 1-4 to 1-5)
• The dock-attach signal for waking the MessagePad and for autodocking (pp. 1-6 to 1-7)
• Power adapter pins (p. 1-7)
• Connector pinout and signal groups (pp. 1-8 to 1-10)
• The JAE mating plug, the switched 5 V supply, and the specification for a MessagePad power adapter (pp. 1-11 to 1-13)

What it settles

Power adapter requirements (pp. 1-12 to 1-13)

Parameter	Requirement
Open-circuit voltage	6.75 to 7.50 V; no more than 7.7 V below 5 mA
Source resistance	0.2 to 0.4 Ω, over 5 to 1300 mA
Current limit	1.1 to 1.3 A
Output at 500 mA / 1000 mA / 1300 mA	7.07–7.50 V / 6.87–7.50 V / 6.75–7.50 V
Ripple	100 mV peak to peak maximum
Overvoltage protection	10.0 V nominal, 12.0 V maximum
Drain from the batteries with the adapter unplugged from the mains	100 µA maximum

• The adapter's positive feeds pins 2 and 14 and its ground pins 3, 15 and 16. All MessagePads built up to the date of the draft are four-cell devices, so the two-cell input on pin 1 is not connected (p. 1-7).
• The dock 5 V supply on pin 11 is 4.5 to 5.5 V and may supply 100 mA, out of a 500 mA 5 V budget shared with the PC Cards. It is on only while a serial channel is active or audio is playing or recording (p. 1-11).
• The mating plug is a JAE part: RX04-26P-SF1 locking or RX04-26P1-SF1 non-locking (p. 1-11).

InterConnect to DIN 8 serial (Table 1-1)

Signal	HSKo	HSKi	TXD−	Gnd	RXD−	TXD+	GPI	RXD+
InterConnect pin	19	20	18	23	8	6	7	21
DIN 8 pin	1	2	3	4	5	6	7	8

What this document does not contain

It is a draft: one figure is labelled "update typical curve". It is written for the MessagePad and does not mention the eMate 300. It gives no mechanical drawing of the socket and no circuit for the Newton Serial Adapter itself.

Pages that cite this document

• Apple Newton MessagePad: the InterConnect port
• Apple Newton accessories: the Newton Serial Adapter
• Apple Newton MessagePad General Maintenance: adapter requirements

Download: Newton Interconnect Port Hardware Specification (1997).pdf