| ID | Tandy Radio Shack TRS-80 Model 4 |
|---|---|
| Short Name | |
| Name | TRS-80 Model 4 |
| Company | Tandy Radio Shack |
| Description | The TRS-80 model 4 (ref 26-1068/69) was one of the last models of the TRS-80 series (and perhaps the less known). It ran at 4 MHz and displayed 80 columns x 24 lines in Model 4 mode, but was fully compatible with the TRS-80 model 3 and in Model 3 mode actually displayed 64x16 and ran at the Model 3's 2 MHz. It had 64 or 128 KB RAM, the 64 upper KB being used as a ram disk. It had one or two 5.25" floppy disk (184 KB each) and ran under TRSDOS 6.0 or 1.3, LDOS or CP/M. A transformation kit "TRS80 model III -> model IV" was available. The Model 4 was followed by the Model 4D (ref. 26-1070). The only difference being double sided drives -384 KB, instead of single sided drives. A portable version of the Model IV called Model 4P (ref. 26-1080) was also marketed few time after. |
| Date Available | 1983 |
| Type | Computer |
| Emulators | |
| Alternate Names |
Tandy Radio Shack TRS-80 Model 4 |
| Links | |
| Matches |
emutopia 418 tosec Tandy Radio Shack TRS-80 Model 4 - Various oldcomputers 244 |
| emutopia | 418 | {
"id": 418,
"name": "Tandy Radio Shack TRS-80",
"shortName": "tandy-radio-shack-trs-80",
"url": "https://emutopia.com/index.php/emulators/category-items/3-emulators/418-tandy-radio-shack-trs-80",
"type": "Computers",
"emulators": [
1466
]
} |
|---|---|---|
| tosec | Tandy Radio Shack TRS-80 Model 4 - Various | {
"id": "Tandy Radio Shack TRS-80 Model 4 - Various",
"name": "Tandy Radio Shack TRS-80 Model 4 - Various",
"altNames": [
"Tandy Radio Shack TRS-80 Model 4"
]
} |
| oldcomputers | 244 | {
"type_id": 1,
"id": 244,
"pages": {
"photos": "photos.asp?t=1&c=244&st=1",
"adverts": "photos.asp?t=2&c=244&st=1",
"hardware": "hardware.asp?t=1&c=244&st=1",
"emulators": "emulator.asp?c=244&st=1",
"links": "links.asp?c=244&st=1",
"docs": "docs.asp?c=244&st=1",
"comments": "forum.asp?c=244&st=1"
},
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_Running_s1.jpg",
"company_link": "company.asp?st=1&m=125",
"company_name": "Tandy Radio Shack",
"company_logo": "https://www.old-computers.com/museum/logos/Tandy_Logo.gif",
"description": "The TRS-80 model 4 (ref 26-1068/69) was one of the last models of the TRS-80 series (and perhaps the less known). It ran at 4 MHz and displayed 80 columns x 24 lines in Model 4 mode, but was fully compatible with the <a href=\"computer.asp?c=18\">TRS-80 model 3</a> and in Model 3 mode actually displayed 64x16 and ran at the Model 3's 2 MHz.\nIt had 64 or 128 KB RAM, the 64 upper KB being used as a ram disk. It had one or two 5.25\" floppy disk (184 KB each) and ran under TRSDOS 6.0 or 1.3, LDOS or CP/M.\nA transformation kit \"TRS80 model III -> model IV\" was available.\nThe Model 4 was followed by the <b>Model 4D</b> (ref. 26-1070). The only difference being double sided drives -384 KB, instead of single sided drives.\nA portable version of the Model IV called <a href=\"computer.asp?c=1083\">Model 4P</a> (ref. 26-1080) was also marketed few time after.",
"name": "TRS 80 MODEL 4",
"manufacturer": "Tandy Radio Shack",
"type": "Professional Computer",
"origin": "U.S.A.",
"year": "1983",
"built_in_language": "None",
"keyboard": "Typewriter style 83 keys with numeric keypad",
"cpu": "Zilog Z80",
"speed": "4 MHz",
"ram": "64 KB (up to 128 KB)",
"rom": "14 KB",
"text_modes": "64 x 16 / 32 x 16 / 64 x 40 / 80 x 24",
"graphic_modes": "None",
"colors": "Monochrome green phosphore",
"sound": "Built-in speaker",
"size_weight": "47.5 (W) x 52 (D) x 31 (H) cm",
"io_ports": "Tape (500 or 1500 bauds), Centronics, I/O ports compatible with Model III, Serial (4D)",
"built_in_media": "One or Two 5.25'' disk-drives",
"os": "TRSDOS 6.0 or 1.3, LDOS, CP/M",
"power_supply": "Built-in power supply unit",
"price": "From $1990. In later years the price came down to about $1000<br>By 1990 the Model 4D was being closed out at $599",
"photos": [
{
"name": "First version ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_System_s1.jpg",
"description": "Two Model 4 versions were released. One can recognize them at the surface from the different arrangement of the arrow keys."
},
{
"name": "Second version ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_SystemUS_s1.jpg",
"description": "The second version had an improved gate-array mainboard and a new location for the serial port.<br>\r\nThe arrow keys are now clustered to the right of the keyboard.<br>\r\nThis version features a second 3.5\" DS DD 720 KB floppy drive (Tandy option).\r\n"
},
{
"name": "Model 4 plate ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_Plate_s1.jpg",
"description": ""
},
{
"name": "Both keyboard versio... ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_Keyboards_s1.jpg",
"description": ""
},
{
"name": "Keyboard close-up ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_KeybCloseUp_s1.jpg",
"description": "The red button is the Reset switch"
},
{
"name": "Side view ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_SideView_s1.jpg",
"description": ""
},
{
"name": "Top view ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_TopView_s1.jpg",
"description": ""
},
{
"name": "Front panel ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_FDDs_s1.jpg",
"description": "Both FDD drives were Tandon Single-sided, single density models."
},
{
"name": "Bottom side ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_BottomView_s1.jpg",
"description": "<b><font color=\"blue\">(1)</font></b> Parallel printer connector<br>\r\n<b><font color=\"blue\">(2)</font></b> Serial connector<br>\r\n<b><font color=\"blue\">(3)</font></b> Expansion port connector<br>\r\n<b><font color=\"blue\">(4)</font></b> Video adjustment<br>\r\n<b><font color=\"blue\">(5)</font></b> Tape recorder DIN socket"
},
{
"name": "Inside #1 ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_Inside_s1.jpg",
"description": "The mainboard is mounted vertically at the back."
},
{
"name": "Inside #2 ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_TopCover_s1.jpg",
"description": "The top cover holds the CRT and its electronics. A fan has been added on top of the CRT."
},
{
"name": "Mainboard, 1st versi... ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_Mainboard_s2.jpg",
"description": "The fist mainboard version used only standard chips. It had 64 KB of RAM. Provision was made for a second 64 KB RAM bank.<br>\r\nThe separate floppy-disk controller card was located behind the mainboard as well as a smal sound generator circuit."
},
{
"name": "Mainboard, 2nd versi... ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_Mainboard_s1.jpg",
"description": "The second \"gate array\" version included the floppy-disk controller, the sound generator and buzzer and a second serial port.<br><br>\r\n<b><font color=\"blue\">(1)</font></b> Power connector<br>\r\n<b><font color=\"blue\">(2)</font></b> Video connector<br>\r\n<b><font color=\"blue\">(3)</font></b> Tape recorder connector<br>\r\n<b><font color=\"blue\">(4)</font></b> 128 KB RAM chips (16x4164 equivalents)<br>\r\n<b><font color=\"blue\">(5)</font></b> WDC1865 UART, serial port controller<br>\r\n<b><font color=\"blue\">(6)</font></b> WD1773 floppy-disk controller<br>\r\n<b><font color=\"blue\">(7)</font></b> BIOS ROMs<br>\r\n<b><font color=\"blue\">(8)</font></b> Z80 CPU socket. In this machine, the CPU chip was replaced by a RAM expansion piggy-back card\r\n<br><br>\r\nOther chips were custom made for Tandy and had unknown part numbers."
},
{
"name": "RAM card ",
"image": "https://www.old-computers.com/museum/photos/Tandy_Model4_RamCard_s1.jpg",
"description": "This RAM card is inserted on the Z80 CPU socket and provides up to 1 MB of extra RAM (2 x 512 KB DIP modules) used as a virtual floppy-disk drive."
}
],
"adverts": [
{
"image": "https://www.old-computers.com/museum/adverts/Tandy_Model4D_Advert_s1.jpg",
"name": "US advert, Nov. 1985"
}
],
"hardware": [
{
"name": "Remote Unit ActiveSerial# 26-1210",
"image": "https://www.old-computers.com/museum/hardware/tandy_trs80-m1_remote-unit-active.jpg",
"description": "> Serial# 26-1210<br>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.\n<br><br>\nIt cost 2895fr (France, 1981)"
},
{
"name": "Network II boxp/n 26-1211",
"image": "https://www.old-computers.com/museum/hardware/Tandy_Network2_s1.jpg",
"description": "> p/n 26-1211<br>This box allowed up to 16 TRS computer to be networked. Three network boxes were released by Tandy (I, II and III).<br>\nThe 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.<br>\nThe network III allowed automated control of the network so that users could easily access programs and data stored on the server's storage device.<p class=\"petitgris\">Thanks to <b>David Sutherland</b> for the pictures.</p>"
},
{
"name": "DMP-200",
"image": "https://www.old-computers.com/museum/hardware/Tandy_Model3_DMP200_s1.jpg",
"description": "80-column, 100 cps dot matrix printer."
},
{
"name": "Daisy Wheel Printer IISerial# 26-1158",
"image": "https://www.old-computers.com/museum/hardware/tandy_trs80-m1_daisy-wheel-printer-2_1.jpg",
"description": "> Serial# 26-1158<br>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.\n<br><br>\nIt cost 9595fr (France, 1981)"
},
{
"name": "Line Printer I Ref# 26-7017",
"image": "https://www.old-computers.com/museum/hardware/Tandy_Model1_LinePrinter1_s1.jpg",
"description": "> Ref# 26-7017<br>This printer was a custom version of the Oki Microline 80.<br>\nPrinted 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.\n<br><br>\nIt cost 716 Euros in 1981 (France)."
},
{
"name": "Line Printer IIISerial# 26-1156",
"image": "https://www.old-computers.com/museum/hardware/tandy_trs80-m1_line-printer-3_1.jpg",
"description": "> Serial# 26-1156<br>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 !\n<br<<br>\nIt cost 9950fr in 1981 (France). \n"
},
{
"name": "Line Printer VISerial# 26-1166",
"image": "https://www.old-computers.com/museum/hardware/tandy_trs80-m1_line-printer-6_1.jpg",
"description": "> Serial# 26-1166<br>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.\n<br><br>\nIt cost 5495fr in 1981 (France)."
},
{
"name": "TP-10 Thermal PrinterBox",
"image": "https://www.old-computers.com/museum/hardware/tandy_trs80_tp-10_thermal-printer_box.jpg",
"description": "> Box<br>"
},
{
"name": "Exatron Stringy Floppy drive",
"image": "https://www.old-computers.com/museum/hardware/Tandy_Model3_ExatronWafer_s1.jpg",
"description": "> Stringy Floppy drive<br>The Exatron Stringy Floppy (ESF) was a low-cost data—storage system that fitted the gap, between cassettes and disk drives.<br>\nThe system was based on a miniature endless—loop tape cartridge called a \"wafer\".<br>\nThe 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. \n<br><br>\n<b>Matt</b> reports to us:<br><font color=\"#666666\">\nA 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.</font>\n<p class=\"petitgris\">Thanks to <b>David Sutherland</b> for the pictures</p>"
}
],
"emulators": [
{
"name": "David Keil's TRS-80 Model III/4/4P Emulator Page",
"url": "http://discover-net.net/~dmkeil/trs80/model4.htm",
"platform": "MS DOS",
"description": "This program emulates a complete TRS-80"
},
{
"name": "Matthew Reed's TRS-80 Emulator Web Site",
"url": "http://www.arrowweb.com/mkr/",
"platform": "MS DOS",
"description": "This page offers shareware versions of a TRS-80 Model 4 emulator and a TRS-80 Model 1-2 emulator"
},
{
"name": "TRS-80 Model III/4 Emulator",
"url": "http://www.vavasour.ca/jeff/trs80.html#model4",
"platform": "MS DOS",
"description": "This TRS-80 Model III/4 Emulator is a commercial product "
},
{
"name": "Model 4 Emulator",
"url": "http://www.arrowweb.com/mkr/",
"platform": "Windows",
"description": ""
},
{
"name": "XTRS for Unix / X",
"url": "http://www.research.digital.com/SRC/personal/Tim_Mann/trs80.html",
"platform": "Unix / Linux",
"description": ""
},
{
"name": "xtrs: TRS-80 Model I/III/4 Emulator for Unix",
"url": "http://www.tim-mann.org/xtrs.html",
"platform": "Unix / Linux",
"description": "xtrs is a Radio Shack TRS-80 Model I/III/4/4P emulator for Unix and the X Window System"
},
{
"name": "TRS-80 Level I BASIC in a browser",
"url": "http://www.vavasour.ca/jeff/trs80.html#simulator",
"platform": "Other platform",
"description": "With this Java emulator, you'll be able to write a BASIC program directly in your browser!"
},
{
"name": "Ira Goldklang's TRS-80 Revived Pages",
"url": "http://www.trs-80.com/trs80-e.htm",
"platform": "Multiplatform",
"description": "A complete list of TRS-80 emulators for various platforms !"
},
{
"name": "MESS",
"url": "http://www.mess.org",
"platform": "Multiplatform",
"description": "MESS emulator also emulates a TRS-80 systems"
}
],
"links": [
{
"url": "computer.asp?st=1&c=1324",
"name": "Sysdata Eletronica - JR",
"description": "Online Magazine dedicated to the TRS-80 and other Vintage - Monthly Issues"
},
{
"url": "computer.asp?st=1&c=1302",
"name": "Radionic - Model R1001",
"description": "Lof of infos about all TRS-80 computers"
},
{
"url": "computer.asp?st=1&c=242",
"name": "Tandy Radio Shack - TRS 80 MODEL 16",
"description": "Level 1 & 2 Basic summaries, Tandy time-lines, price-list, etc ... !"
},
{
"url": "computer.asp?st=1&c=1083",
"name": "Tandy Radio Shack - TRS 80 Model 4P",
"description": "Here, you can actually/virtually flip-through the pages to view the content of every RadioShack catalog!"
},
{
"url": "computer.asp?st=1&c=409",
"name": "Tandy Radio Shack - TRS 80 MODEL I",
"description": "Full of infos"
},
{
"url": "computer.asp?st=1&c=243",
"name": "Tandy Radio Shack - TRS 80 MODEL II",
"description": "Infos, tools and home of xtrs, a Model I/III/4 emulator for Unix "
},
{
"url": "computer.asp?st=1&c=18",
"name": "Tandy Radio Shack - TRS 80 MODEL III",
"description": "Discussion about Tandy computers"
},
{
"url": "computer.asp?st=1&c=766",
"name": "Tandy Radio Shack - TRS-80 Model 12"
},
{
"url": "HTTP://WWW.8BIT-MICRO.COM",
"name": "8bit-micro.com - Online TRS-80 Computer Magazine"
},
{
"url": "http://freespace.virgin.net/david.sampson/",
"name": "David's TRS-80 Page"
},
{
"url": "http://www.trs-80.com/",
"name": "Ira Goldklang's TRS-80 Revived Pages"
},
{
"url": "http://ganley.org/software/trs80.html",
"name": "Java TRS-80 Model 1 BASIC Interpreter"
},
{
"url": "http://personal.nbnet.nb.ca/mclays/trsmod1.html",
"name": "Mike's Personal Computer Museum"
},
{
"url": "http://www.RadioShackCatalogs.com",
"name": "RadioShackCatalogs.com"
},
{
"url": "http://www.kjsl.com/trs80",
"name": "The TRS-80 Home Page"
},
{
"url": "http://www.tim-mann.org/trs80.html",
"name": "Tim Mann's TRS-80 Page"
},
{
"url": "news:comp.sys.tandy",
"name": "comp.sys.tandy"
}
]
} |