yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
249 lines
10 KiB
Markdown
249 lines
10 KiB
Markdown
---
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title: Tandy Radio Shack TRS 80 Model 4P
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categories:
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- Computers
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types:
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- Portable
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origins:
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- U.S.A.
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years:
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- '1983'
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cpus:
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- Z80A
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params:
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name: TRS 80 Model 4P
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image: /media/museum/photos/tandy_model4p_system_2.jpg
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company: /companies/tandy-radio-shack
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company_name: Tandy Radio Shack
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specs:
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- label: NAME
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value: TRS 80 Model 4P
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- label: MANUFACTURER
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value: Tandy Radio Shack
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- label: TYPE
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value: Portable
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- label: ORIGIN
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value: U.S.A.
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- label: YEAR
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value: October 1983
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- label: BUILT IN LANGUAGE
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value: None
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- label: KEYBOARD
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value: Typewriter style, 70 keys with numeric keypad and arrow keys
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- label: CPU
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value: Z80A
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- label: SPEED
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value: 4 MHz
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- label: RAM
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value: 64 or 128 KB
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- label: ROM
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value: 4 KB
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- label: TEXT MODES
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value: 32 or 64 x 16 / 64 x 40 / 80 x 24
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- label: GRAPHIC MODES
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value: None
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- label: COLORS
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value: Monochrome
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- label: SOUND
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value: Buzzer
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- label: I/O PORTS
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value: Parallel, Serial, Expansion bus
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- label: BUILT IN MEDIA
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value: |-
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2 x 5.25'' SS SD 180 KB floppy drives\
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Very late models had double-sided TEAC drives
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- label: OS
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value: TRS-DOS 6.0 to 6.2, LS-DOS 6.3, CP/M
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- label: POWER SUPPLY
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value: Built-in power supply unit
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- label: PERIPHERALS
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value: Built-in 300-baud modem, external HDD
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- label: PRICE
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value: $1,790
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tabs:
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- photos
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- hardware
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- emulators
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- links
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forum_thread: 1053
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photos:
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- title: MODEL 4P
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subtitle: ''
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text: ''
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image: /media/museum/photos/tandy_model4p_front_ebay_2.jpg
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- title: FRONT
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subtitle: ''
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text: ''
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image: /media/museum/photos/tandy_model4p_front_ebay_1.jpg
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- title: KEYBOARD
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subtitle: ''
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text: ''
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image: /media/museum/photos/tandy_model4p_keyboard_1.jpg
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- title: BACK
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subtitle: ''
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text: |-
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from left to right:
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\- RS232C connector\
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\- I/O bus\
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\- parallel port
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image: /media/museum/photos/tandy_model4p_back_1.jpg
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- title: CLOSED
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subtitle: ''
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text: ''
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image: /media/museum/photos/tandy_model4p_closed_1.jpg
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hardware:
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- title: REMOTE UNIT ACTIVE
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subtitle: Serial# 26-1210
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text: |-
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This rare unit is meant for teachers to control up to 16 TRS-80 Model 1 from a another TRS-80 equiped with min-disk. All the controled TRS-80 model 1 must be equiped with Level II.
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It cost 2895fr (France, 1981)
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image: /media/museum/hardware/tandy_trs80-m1_remote-unit-active.jpg
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- title: NETWORK II BOX
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subtitle: p/n 26-1211
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text: |-
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This box allowed up to 16 TRS computer to be networked. Three network boxes were released by Tandy (I, II and III).\
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The Network II required verbal communication between the server operator and the remote user, and data transfer had to be completed one user at a time.\
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The network III allowed automated control of the network so that users could easily access programs and data stored on the server's storage device.
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Thanks to **David Sutherland** for the pictures.
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image: /media/museum/hardware/tandy_network2_s1.jpg
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- title: DMP-200
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subtitle: ''
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text: 80-column, 100 cps dot matrix printer.
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image: /media/museum/hardware/tandy_model3_dmp200_s1.jpg
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- title: DAISY WHEEL PRINTER II
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subtitle: Serial# 26-1158
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text: |-
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This is a high-quality printer meant to be used with wordprocessors. Some interchangeable daisy-wheels were available (Courrier, Elite, Madeleine). It could print 163 characters per line (34cm), at a 43 cps rate.
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It cost 9595fr (France, 1981)
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image: /media/museum/hardware/tandy_trs80-m1_daisy-wheel-printer-2_1.jpg
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- title: LINE PRINTER I
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subtitle: Ref# 26-7017
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text: |-
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This printer was a custom version of the Oki Microline 80.\
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Printed lower and upper case on paper rolls or listing paper (24cm wide) from 40 to 80 columns/line, at a speed rate of 28 lines/minute.
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It cost 716 Euros in 1981 (France).
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image: /media/museum/hardware/tandy_model1_lineprinter1_s1.jpg
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- title: LINE PRINTER III
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subtitle: Serial# 26-1156
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text: This printer can print lower and upper case, at a speed rate of 120 c/s, on paper up to 38cm wide. It is conceived for intensive use ! It cost 9950fr in 1981 (France).
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image: /media/museum/hardware/tandy_trs80-m1_line-printer-3_1.jpg
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- title: LINE PRINTER VI
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subtitle: Serial# 26-1166
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text: |-
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This large printer can print lower and upper case, graphic characters and symbols at a speed rate of 100 c/s ! This is definately a professional printer.
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It cost 5495fr in 1981 (France).
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image: /media/museum/hardware/tandy_trs80-m1_line-printer-6_1.jpg
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- title: TP-10 THERMAL PRINTER
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subtitle: Box
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text: ''
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image: /media/museum/hardware/tandy_trs80_tp-10_thermal-printer_box.jpg
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- title: EXATRON
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subtitle: Stringy Floppy drive
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text: |-
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The Exatron Stringy Floppy (ESF) was a low-cost data—storage system that fitted the gap, between cassettes and disk drives.\
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The system was based on a miniature endless—loop tape cartridge called a "wafer".\
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The amount of data that could be recorded on a wafer depended on the length of tape in it, typically, a 50—foot wafer could hold at least 40 KB of programs or data.
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**Matt** reports to us:\
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A curiousity about the model 1, CPU SPEED had a direct relatonship with STORAGE CAPACITY. if you doubled the clock speed of your MODEL 1 CPU you doubled the amount of data you could store on your stringy floppies. this is a feat that no other computer no matter how many ghz you have in your PC can do today without using compression.
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Thanks to **David Sutherland** for the pictures
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image: /media/museum/hardware/tandy_model3_exatronwafer_s1.jpg
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emulators:
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- title: David Keil's TRS-80 Model III/4/4P Emulator Page
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url: http://discover-net.net/~dmkeil/trs80/model4.htm
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platform: MS DOS
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text: This program emulates a complete TRS-80
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- title: Matthew Reed's TRS-80 Emulator Web Site
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url: http://www.arrowweb.com/mkr/
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platform: MS DOS
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text: This page offers shareware versions of a TRS-80 Model 4 emulator and a TRS-80 Model 1-2 emulator
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- title: TRS-80 Model III/4 Emulator
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url: http://www.vavasour.ca/jeff/trs80.html#model4
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platform: MS DOS
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text: This TRS-80 Model III/4 Emulator is a commercial product
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- title: 'xtrs: TRS-80 Model I/III/4 Emulator for Unix'
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url: http://www.tim-mann.org/xtrs.html
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platform: Unix / Linux
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text: xtrs is a Radio Shack TRS-80 Model I/III/4/4P emulator for Unix and the X Window System
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- title: TRS-80 Level I BASIC in a browser
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url: http://www.vavasour.ca/jeff/trs80.html#simulator
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platform: Other platform
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text: With this Java emulator, you'll be able to write a BASIC program directly in your browser!
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- title: Ira Goldklang's TRS-80 Revived Pages
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url: http://www.trs-80.com/trs80-e.htm
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platform: Multiplatform
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text: A complete list of TRS-80 emulators for various platforms !
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- title: MESS
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url: http://www.mess.org
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platform: Multiplatform
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text: MESS emulator also emulates a TRS-80 systems
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links:
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- title: 8bit-micro.com - Online TRS-80 Computer Magazine
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url: HTTP://WWW.8BIT-MICRO.COM
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text: Online Magazine dedicated to the TRS-80 and other Vintage - Monthly Issues
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- title: David's TRS-80 Page
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url: http://freespace.virgin.net/david.sampson/
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text: ''
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- title: Ira Goldklang's TRS-80 Revived Pages
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url: http://www.trs-80.com/
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text: Lof of infos about all TRS-80 computers
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- title: Java TRS-80 Model 1 BASIC Interpreter
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url: http://ganley.org/software/trs80.html
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text: ''
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- title: Mike's Personal Computer Museum
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url: http://personal.nbnet.nb.ca/mclays/trsmod1.html
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text: Level 1 & 2 Basic summaries, Tandy time-lines, price-list, etc ... !
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- title: RadioShackCatalogs.com
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url: http://www.RadioShackCatalogs.com
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text: Here, you can actually/virtually flip-through the pages to view the content of every RadioShack catalog!
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- title: The TRS-80 Home Page
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url: http://www.kjsl.com/trs80
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text: Full of infos
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- title: Tim Mann's TRS-80 Page
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url: http://www.tim-mann.org/trs80.html
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text: Infos, tools and home of xtrs, a Model I/III/4 emulator for Unix
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- title: Web Wiz CAPTCHA
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url: http://www.webwizcaptcha.com
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text: Discussion about Tandy computers
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related:
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- /museum/radionic-model-r1001
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- /museum/sysdata-eletronica-jr
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- /museum/tandy-radio-shack-trs-80-model-12
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- /museum/tandy-radio-shack-trs-80-model-16
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- /museum/tandy-radio-shack-trs-80-model-4
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- /museum/tandy-radio-shack-trs-80-model-i
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- /museum/tandy-radio-shack-trs-80-model-ii
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- /museum/tandy-radio-shack-trs-80-model-iii
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oc_id: 1083
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source:
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url: https://web.archive.org/web/20230608220843/http://www.old-computers.com/museum/computer.asp?c=1083
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date: '2023-06-08'
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---
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The Model 4P was the transportable version of the [Model 4](/museum/tandy-radio-shack-trs-80-model-4/).
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Apart from the case and display sizes, technical features were almost identical to the Model 4's. The dual half-sized floppy drives were still single-sided versions but the keyboard, which slided underneath the computer, was far better than the one of the desktop version.
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The external floppy drive connector was removed, as well as the Model 3 ROM, but a ROM image could be loaded from diskette to run Model 3 programs. An optional 300-baud modem could be also installed into the machine.
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Very late models had double-sided TEAC drives.
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---
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Further information from **Greg Trotter**\
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I used a Model 4P for many years. It was pretty much identical to the Model 4 in functionality, except for:\
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\- Portability, of course\
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\- No Model III ROM (but you could load an image of the ROM into the RAM and reboot, giving perfect compatibility)\
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\- It did have a modem card slot, except that the card edge provided power only; the outward face of the card had a short DC-25 serial cable, just long enough to get to the serial port of the 4P.\
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\- There was no cassette interface on the 4P.\
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\- The keyboard was indeed superior; I liked it better because it was corded and could be moved to any angle.
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Of course, portable just meant "easier to transport." The entire unit weighed about 28 pounds, if I remember correctly. I lugged it through airports, and it fit quite comfortably in the overhead bin.
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