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6,654 pages: 1,289 machines, 702 software, 460 companies, 64 history, 17 articles, 59 fun.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

content/museum/epson-px-4-hc-40.md

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+---
+title: Epson PX 4 / HC 40
+categories:
+- Computers
+types:
+- Portable
+origins:
+- Japan
+years:
+- '1984'
+cpus:
+- uPD 70008
+params:
+  name: PX 4 / HC 40
+  company: /companies/epson
+  company_name: Epson
+  specs:
+  - label: NAME
+    value: PX 4 / HC 40
+  - label: MANUFACTURER
+    value: Epson
+  - label: TYPE
+    value: Portable
+  - label: ORIGIN
+    value: Japan
+  - label: YEAR
+    value: '1984'
+  - label: BUILT IN LANGUAGE
+    value: Basic
+  - label: KEYBOARD
+    value: Full-stroke keyboard (chicklet keyboard available)
+  - label: CPU
+    value: uPD 70008 (Z80 compatible )
+  - label: SPEED
+    value: 3.6864 MHz
+  - label: CO-PROCESSOR
+    value: 'CMOS 7508 4bit : handles housekeeping, clock, battery, etc.'
+  - label: RAM
+    value: '64 KB : 64 Kbit CMOS D-RAM x 8'
+  - label: ROM
+    value: '96 KB : 256 K-bit CMOS ROM X 3'
+  - label: TEXT MODES
+    value: 40 x 8
+  - label: GRAPHIC MODES
+    value: 240 x 64
+  - label: COLORS
+    value: Monochrom LCD display
+  - label: SOUND
+    value: Beeper
+  - label: SIZE / WEIGHT
+    value: A4 size
+  - label: I/O PORTS
+    value: Serial, RS232c, cassette, cartridge port, printer (parallel) port, expansion port, sound in & out
+  - label: BUILT IN MEDIA
+    value: Microcasette
+  - label: OS
+    value: CP/M with disk-drives units
+  - label: POWER SUPPLY
+    value: Built-in battery which can last for 4 hours
+  - label: PERIPHERALS
+    value: Printers, plotters, tape-recorder, ROM & RAM expansion, barcode reader, EPROM burner, replacement keyboard, modem and more...
+  - label: PRICE
+    value: 1590 FF (France, january 1988)
+  tabs:
+  - photos
+  - hardware
+  - links
+  photos:
+  - title: JAPANESE USER MANUAL
+    subtitle: ''
+    text: |-
+      Hello sweety !
+
+      Thanks to the [TATA EPSON HC-40 Page](http://page.freett.com/tata93/hc40.htm) for this picture.
+    image: null
+  hardware:
+  - title: EPROM WRITER CARTRIDGE
+    subtitle: ''
+    text: Epson H415A-EA1 Prom Writer Cartridge II. It plugged into the corner expansion port of the PX-4 and had a 32pin ZIF (Zero Insertion Force) socket.
+    image: null
+  - title: EXPANSION SKETCH
+    subtitle: ''
+    text: |-
+      There are for sure a lot of peripherals available for the HC-40 ! Wow...
+
+      There are printers, plotters, RAM & ROM expansions, disk-drives, EPROM burner, barcode reader, keypad, etc...
+
+      A larger and better picture is available at the [TATA EPSON HC-40 Page](http://page.freett.com/tata93/hc40.htm).
+
+      Thanks to the [TATA EPSON HC-40 Page](http://page.freett.com/tata93/hc40.htm) for this picture.
+    image: null
+  links:
+  - title: Epson PX4 info page
+    url: http://www.discordia.org.uk/px4/
+    text: Pinouts and CP/M command reference among other things
+  - title: TATA EPSON HC-40 Page
+    url: http://page.freett.com/tata93/hc40.htm
+    text: Great informations here (Japanese) !
+  comments:
+  - author: Simon (Australia)
+    date: Thursday 29th March 2012
+    text: I have one of these in a box somewhere, along with the PROM writer...... very funky little unit, well ahead of its time.
+  - author: Ian Chard (UK)
+    date: Friday 4th May 2007
+    text: When I did A-level computing in 1990, I remember doing a case study of how the UK music singles chart worked. Shops entered details of sales into little computers, and I remember that the Epson PX-4 was specifically named. No idea if it was true, though!
+  oc_id: 370
+  source:
+    url: https://web.archive.org/web/20230608211026/http://www.old-computers.com/museum/computer.asp?c=370
+    date: '2023-06-08'
+---
+
+This computer is the successor of the [HX-20](/museum/epson-hc-hx-20/).
+
+The main cosmetic difference is a wider screen that can be adjusted to the right angle.
+
+There are 2 ROM slots under the machine to implement additional ROM programs.
+
+On the right of the LCD display can be plugged a tape-recorder, a plotter, RAM expansions, a lot of things or ... nothing.
+
+A lot of peripherals were available for this little computer (see hardware page), at least in japan.
+
+The PX-4 was logically followed by the [PX-8](/museum/epson-px-8-hc-88-geneva/).