TRS-80.org » Graphics

E/RAM

Matthew Reed — Tue, 20 Apr 2010 13:15:00 +0000

The E/RAM was a high-resolution add-on for the TRS-80 Model I. Introduced in 1980 for a price of $349.95, the E/RAM was designed and manufactured by Keyline Computer Products from Tulsa, Oklahoma. It was sold by Vern Street Products, also in Tulsa.

The E/RAM (an acronym for Extended Random Access Memory) contained 6K of video memory. It increased the TRS-80 graphics resolution to 256 by 192, with the high-resolution graphics overlaying the text screen. The graphics could be enabled and disabled using either software or a hardware switch.

The E/RAM came in a steel case measuring 2 1/2″ high, 6″ wide, and 12″ deep. The self-contained unit sat next to the Model I and installed in a straightforward way:

High-resolution graphics for the TRS-80

Matthew Reed — Tue, 13 Apr 2010 13:15:00 +0000

Unlike many competing computers, the TRS-80 Model I lacked any form of built-in high-resolution graphics. Although some TRS-80 compatible computers, such as the LNW80, offered high-resolution as a feature, the only graphics possible with the Model I were relatively low-resolution 128 by 48 block graphics. The many games written for the Model I made good use of these block graphics, and Radio Shack never made high-resolution a standard feature of the Model I, III, or 4. Several companies created products to address this deficiency, with some becoming more popular than others.

The SubLOGIC 50/T80

Matthew Reed — Thu, 01 Apr 2010 13:15:00 +0000

The SubLOGIC 50/T80 was a high-resolution add-on for the TRS-80 Model I. It was created by SubLOGIC, a company better known to TRS-80 users for their T80-FS1 Flight Simulator.

Here is the text of the 1980 product introduction:

The SubLOGIC 50/T80 system is a high performance professional graphics display system designed to be used directly with the TRS-80. It provides the high-resolution graphics capability which the 80 lacks—the kind of graphics needed for scientific, engineering, and educational applications. Dense drawings, graphs, and even alphanumerics can be put on the 50/T80’s 256 by 240 dot screen. The 50/T80 has the support of SubLOGIC’s 2D and 3D graphics packages, which are powerful and easy to use. They operate easily from BASIC as well as assembly language.

The Model 4 Grafyx Solution

Matthew Reed — Tue, 30 Mar 2010 13:15:00 +0000

The Model 4 Grafyx Solution was the most popular high-resolution add-on for the TRS-80 Model 4, and probably the most popular Model 4 add-on in general. It was introduced in 1984 for a price of $199.95 by Micro-Labs, creators of the earlier Model III Grafyx Solution. The Model 4 Grafyx Solution provided true high-resolution access to every pixel on the 640 by 240 Model 4 display, yet was easily user-installable in only a few minutes.

Unlike the Model III Grafyx Solution, which was memory mapped, the Model 4 Grafyx Solution was port-mapped. It used the same ports and mapping as the Radio Shack Model 4 high-resolution board. This meant that the Model 4 Grafyx Solution was almost completely compatible with the Radio Shack board and they could run the same programs. This had the odd side effect of making the Model 4 Grafyx Solution in Model III mode incompatible with the Model III Grafyx Solution.

The Model 4 Grafyx Solution had many advantages compared to the Radio Shack board:

The Radio Shack Model 4 High-Resolution Board

Matthew Reed — Tue, 16 Mar 2010 13:15:00 +0000

Radio Shack introduced their high-resolution add-on for the Model 4 (catalog number 26-1126) on October 15, 1983. Just like their Model III high-resolution board, it was never identified by name in any Radio Shack catalog. The official name seems to have been “TRS-80 Model 4 Computer Graphics” but it was usually referred to as the “Radio Shack Model 4 high-resolution board.”

At $249.95, the Model 4 high-resolution board was $80 cheaper than the Model III version. It provided a nearly identical hardware interface to the Model III version, with the same 640 by 240 resolution. It’s interesting to note that the Macintosh screen at the time was 576 by 340.

The Model III Grafyx Solution

Matthew Reed — Thu, 25 Feb 2010 14:16:00 +0000

The Model III Grafyx Solution was a high-resolution graphics add-on for the TRS-80 Model III. Created by Ted Carter, president of Micro-Labs, the Grafyx Solution was introduced in early 1982 for a price of $299.95. There never was a Model I version of the Grafyx Solution.

The Model III Grafyx Solution used a different approach than 80-GRAFIX, an earlier Micro-Labs product for the Model I and III. While 80-GRAFIX could only simulate high-resolution graphics by redefining the character set, the Grafyx Solution provided full access to the 512 by 192 resolution of the Model III.

No soldering was required to install the Grafyx Solution. Instead, installation consisted of plugging the Grafyx Solution into the Model III and using special micro-clips to attach it to specific pins on chips already in the Model III.

The Radio Shack Model III High-Resolution Board

Matthew Reed — Tue, 23 Feb 2010 14:09:00 +0000

Radio Shack introduced their high-resolution add-on for the Model III (catalog number 26-1125) on December 30, 1982 for a price of $369.95. It was never identified by name in any Radio Shack catalog but the official name seems to have been “TRS-80 Computer Graphics Package.” Few ever used that name and it was commonly referred to as the “Radio Shack high-resolution board.”

The Model III high-resolution board offered a resolution of 640 by 240. This was the same resolution as the Model II high-resolution add-on that Radio Shack had introduced the previous year, but it was higher than the normal Model III resolution of 512 by 192. There were so many similarities to the Model II high-resolution add-on that I suspect it was the basis for the Model III version.

CHROMA BASIC

Matthew Reed — Wed, 15 Jul 2009 14:41:35 +0000

The CHROMAtrs was a TRS-80 Model I and III add-on that could display color text and graphics on a separate monitor or television. The CHROMAtrs had advanced graphics and sound features, but using those features required low-level programming that was beyond the abilities of many people. That all changed with the introduction of CHROMA BASIC.

CHROMA BASIC was written by Robert French, who was 14 years old at the time. It added over 68 commands to BASIC to manipulate the graphics, sound, and joystick features of the CHROMAtrs. Although originally priced at $30.00, CHROMA BASIC was soon bundled with the CHROMAtrs package and prominently featured in the advertisements.

The Color-Graf

Matthew Reed — Thu, 19 Feb 2009 18:39:40 +0000

The Color-Graf was a color graphics interface for the TRS-80 Model I and Model III. Sold by Solectronics, the Color-Graf originally cost $260 for the Model I version. That price was later reduced to $195 for the Model I version and $235 for the new Model III version. Solectronics advertised the Color-Graf from 1982 to 1983.

The Mikrokolor Color Graphics Interface

Matthew Reed — Thu, 15 Jan 2009 14:39:37 +0000

The Mikrokolor was a color graphics interface for the TRS-80 Model 100 that was sold by Andreasen's Electronics Research & Development, Inc. The Mikrokolor hardware was designed by Paul Andreasen, the digital interface designed by James Cole, and the software written by Andrew Baird. Andreasen's Electronics Research & Development also sold versions of the Mikrokolor for the Model I, III, 4, and 12 and also the S-100 bus and the Apple II. There was also a $54.00 VHF modulator for the Mikrokolor that operated on channels 7 to 10.

The Mikrokolor fit into much the same category as the later Disk/Video Interface sold by Radio Shack, allowing a Model 100 to be used with a separate monitor. Unlike the Disk/Video Interface, which was black and white only, the Mikrokolor displayed in color.