Changes
/* Specifications */
== 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 [https://web.archive.org/web/20141214160211/http://home.arcor.de/h.boehling/nc100.htm] (author's website) or here [[Media:sg-nc100.zip]] (local copy)
=== Amstrad Notepad Computer - What is it? ===
The model [[NC Series|NC100 ]] is about DIN A4 size with a LCD 8 lines * 80 characters
screen, nearly full size keyboard, a PCMCIA memory card slot on the right
hand side and four coloured keys. The Notepads have standard Centronics
Processor : Z80 compatible CMOS
Operating
frequency : 6 4.606 MHz
Memory : 64K byte internal
(15K system-, 11K upper-, 38K lower memory)
Storage : PCMCIA/JEIDA Memory Cards (PC-Cards) Type I
max. 1M byte SRAM 5 Volt
Display : 480*32 64 pixel disply display (usually 80*8 characters)
Weight : 930 g
Height : 22 mm
- BBC-BASIC with Assembler support
</pre>
=== How to get the Firmware Number? ===
=== What is inside? ===
Inside the NC100 is a SMD layout. I have a german NC100 and the plate circuit board is
labeled Amstrad plc 4500-001P-1, NA999-32142, manual marked C (A-H) and
1 (1-8). All IC's are SMD apart from IC303 which is on the backside of the
NC100 (behind the firmware EPROM cover). On the drawing below I have
labeled all IC'sICs, but you can find it on the layout also!
[[File:NC100_Inside.png]]
Ã────┼───────────────┼────────┼───────────────────────────────────────Â
║302 │NEC Japan │4*34=136│µPD 65034 ║
║ │D65034GD093 │PLCC 136│Customer Chip 136│Custom ASIC ║
Ã────┼───────────────┼────────┼───────────────────────────────────────Â
║303 │NEC Japan │2*16= 32│27C2001 = CMOS EPROM 256K*8 bit ║
╚════¤═══════════════¤════════¤═══════════════════════════════════════╝
</pre>
=== Amstrad NC100/NC150 Simplfied Bock Diagram ===
</pre>
=== The Customer Custom Chip (IC302) ===
<pre>
Type : µPD 65034
Manufacturer : NEC Electronics
Description : Customer Custom Chip with multiple funktions
Process : CMOS
Supply Voltage : +5V
Package : PLCC 136
The chip has multiple funktionsfunctions:
- Clock generator for CPU and UART
The NC100 can also control 27C4001 (512K), 23C2001 (256K), 23C4001 (512K),
23C8001 (1M byte) EPROM's! By the type of the EPROM there had to be set
some different connections, this connections are set by zerro zero Ohm MSDSMD-resistors from the backside of the plate board close to IC303:
╔═════════Ð════════Ð══════Ð══════Ð══════Ð══════╗
- Built-in 26*4 bit RAM
- 4-bit bidirectional data bus
- 4-bit adress address input
- Directly connectable with CPU bus
- Capable of battery backup
homepage: http://www.germany.net/teilnehmer/101.107378/index.htm
</pre>
[[Category:NC Series]][[Category:Amstrad Products]][[Category:Non CPC Computers]]
