Editing Apple Newton MessagePad (section)

== Original MessagePad and MessagePad 100 ==
[[File:Apple Newton MessagePad 100 (Winkelnkemper).jpg|thumb|220px|MessagePad 100 (Felix Winkelnkemper, CC BY-SA 4.0)]]
The Original MessagePad went on sale for US$699 in August 1993.<ref name="mw93">Cary Lu, "Newton" (first look), ''Macworld'', September 1993, pp. 102–105. Internet Archive item [https://archive.org/details/MacWorld_9309_September_1993 MacWorld_9309_September_1993]. Source for: the US$699 price; four AAA alkaline cells, a NiCd pack or an AC adapter; six hours' worst-case alkaline life; overnight trickle charging of the NiCd pack in the Newton; the US$49 external battery charger with one NiCd pack; the lithium button cell that keeps memory for about six months; the US$149 external modem at 2400 bit/s for data and 9600 bit/s for fax, and the first software release's inability to receive faxes; the US$99 Newton Print Pack serial-to-parallel cable with driver software stored in it; and the US$129 Newton Connection Kit and US$199 Connection Pro.</ref> Sharp made it for Apple and calls it model BO-A300 in its service manual. The board is built round the ARM 610, a custom ASIC, a Z85C30 serial controller and an AD7880 12-bit A/D converter for the tablet; the ARM's 20 MHz clock is divided down by the ASIC from a 40 MHz oscillator.<ref name="sharp">Sharp Corporation, ''Service Manual, Model BO-A300'' (Newton MessagePad), 38 pp. Hosted as [[:File:Sharp BO-A300 Newton MessagePad Service Manual.pdf]]; see [[Sharp BO-A300 Service Manual]]. Page numbers are PDF pages: specifications p. 2; block diagram p. 3; power system diagram p. 5; ARM610 and ASIC pp. 6–10; Z85C30, LTC902 and AD7880 pp. 11–12; power circuit and low-battery circuit pp. 14–15; disassembly pp. 18–22; troubleshooting flowcharts pp. 30–32; circuit diagram pp. 37–38.</ref> The MessagePad 100 is the same H1000 hardware with Newton OS 1.3 in place of 1.0 or 1.1, and Apple offered owners of the original an upgrade to the MessagePad 100's capabilities.<ref name="faqmodels" /><ref name="ds100">Apple Computer, ''Newton MessagePad 100'' data sheet, February 1994, L00518B, 2 pp. Hosted as [[:File:Newton MessagePad 100 data sheet (1994).pdf]]. Order number H0123LL/A; ARM 610 at 20 MHz; 4 MB ROM; 640K RAM; 336 × 240 reflective LCD; one PCMCIA Type II slot; LocalTalk-compatible serial port; half-duplex infrared at up to 38.4 kbit/s within 1 m; alkaline output 6.0 V, 1.1 Wh; NiCd output 4.8 V, 200 mAh (both nominal); CR2032 lithium cell; universal 100–240 V adapter; the upgrade offer for the original MessagePad.</ref>

Both use four AAA cells, a CR2032 lithium cell for memory backup, a mini-DIN-8 serial port and one PCMCIA Type II slot at the top of the case. The stylus clips along the right side, and there is no lid.<ref name="ss95" /> Sharp's specification gives the AC adapter as 7 V DC at 500 mA and the infrared link as one-way at up to 19,200 bit/s over 8–80 cm; Apple's MessagePad 100 data sheet gives half-duplex infrared at up to 38.4 kbit/s within 1 m.<ref name="sharp" /><ref name="ds100" />