== A Surgical Guide To The Amstrad Notepad Computer ==
This page is based on Hans-Jürgen Böhling's "surgical guide to the Amstrad NC". The original document is avaliabe here [http://home.arcor.de/h.boehling/nc100.htm] (Authors author's website) or here [[Media:sg-nc100.zip]] (local copy)
=== Amstrad Notepad Computer - What is it? ===
[[File:NC100_BlockDiagram.png]]
<pre>
Amstrad NC100/150 Power Supply Bock Diagram
-------------------------------------------
=== Amstrad NC100/150 Power Supply Bock Diagram ===
[[File:NC100_PowerSupply.png]]
┌─────┐ ┌─────────────────┐
DC6V ┌┬─o───────────┼─────┼───┤ ├─────o +6V
┌┐ │└─o──────┐ + └─────┘ │ DC/DC-Converter │
││└┘ ───┴─── F301 │ ├─────o +5V
└┴────o─┐ ┌───┐ │ │
│ └─┬─┘ ┌──────┤ ├─────o 5VBK
AC-Adaptor │ ───┴─── │ │ and │ Lith. buff. RAM
Input │ ┌───┐ │ │ ├─────o -15V
│ └─┬─┘ │ + │ │ for LCD-Display
│ ───┴─── ───┴─── │ │
│ ┌───┐ ┌───┐ │ ├─────o BD1, IC302
│ └─┬─┘ └─┬─┘ │ Battery Level │ 4*AA<4.2V
│ ───┴─── │ - │ Detector ├─────o BD2, IC302
│ ┌───┐4*AA │Lith. │ │ Lith.<2.3V
│ └─┬─┘ │ │ ├─────o BVD2,IC302
│ │ - │ │ │ 4*AA<3.2V
└────o───────o──────┤ ON/OFF ├─────┐
│ └────────┬────────┘ │
▀▀▀ │ ▀▀▀
│
+6V │
o └─────────┐
│ │
┌┴┐ │
│ │ IC313A │
│ │ ┌─────────┐ │
S301 │ │ │ │ │
┬ └┬┘ │ S Q ├───┘
─┴─ │ │ │
┌────o o────o────o─────────────o├ ─ ─ ─ ─ ┤
│ │ │ │ │
▀▀▀ │ │ ┌─────────┤ R │
_____ │ │ │ │ │
IC307, ALARM o────┘ │ │ └─────────┘
___ │ │
IC301, NMI o─────────┘ │
│
IC302, POFF o──────────────┘
-7-�
On the next pages folowing the pinouts off the most important IC's used in
the NC100. '*' indicates active Low and 'NC' is Not Connected in the NC100
=== The Microprocessor (MPU, IC301) ===
The Microprocessor (MPU, IC301)------------------<pre>
Type : Z84C00
Manufacturer : Zilog Inc.
21 *MREQ 43 A9
22 *IORQ 44 A10
</pre>
-8-�=== The Customer Chip (IC302)===-----------------<pre>
Type : µPD 65034
Manufacturer : NEC Electronics
33 X1 67 GND 101 PD0 135 GND
34 VDD 68 GND 102 VDD 136 GND
</pre>
-9-�=== The Firmware EPROM (IC303)===------------------<pre>
Type : µPD 27C2001
Manufacturer : NEC Electronics
I have double my ROM-space by set in a 27C4001 EPROM, remove J304 and set
in J301 by a pice of wire.
</pre>
-10-�=== The Static Random Access Memory (SRAM, IC304 and IC305) ===-------------------------------<pre>
Type : µPD 43257A
Manufacturer : NEC Electronics
+ = use
</pre>
-11-�=== The PCMCIA card slot (IC306)--------------------===
The NC-100 can use PCMCIA/JEIDA Memory Cards (PC-Cards) Type I, max. 1024K
place. Data transfers are then be done in sector chunks.
<pre>
PCMCIA Card Connector Type I, 5 Volts:
34 GND 68 GND
RFU = Reserved Future Use
</pre>
-12-�=== The Real-Time-Clock (RTC, IC307)===-------------------<pre>
Type : TC8521AP/AM
Manufacturer : Toshiba Corporation
19 XOUT
20 VCC
</pre>
-13-�=== The Universal Asynchronous Receiver Transmitter (UART, IC308)===-----------------------------------------------<pre>
Type : µPD 71051
Manufacturer : NEC Electronics
27 D0
28 D1
</pre>
-14-�=== The RS232-Driver (IC309)===----------------<pre>
Type : µPD 4711A
Manufacturer : NEC Electronics