2024-03-02: The wiki ran out of disk space, so things were not working. This has been resolved by adding another 5GB of quota ;-) Thanks to Tim Lindner for reporting the issues. 2020-05-17: If a page gives you an error about some revision not being found, just EDIT the page and the old page should appear in the editor. If it does, just SAVE that and the page should be restored. OS-9 Al (talk) 12:22, 17 May 2020 (CDT)


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UnderColor, Volume 1, Number 3, January 11, 1985

  • Title: Defuser
  • Author: Terry Kepner
  • Synopsis: Answers to life's little problems.
  • Page Scans: Link


I'm planning to build the 64K upgrade that appeared in the October, 1983 issue of The Color Computer Magazine, for my revision D board computer. In the article it states that the ROM must be changed because it isn’t a 1.1. However, trying EXEC 41175 indicates I have a 1.1 ROM. Do I still have to change ROMs, and what does this number indicate?

Mark Patrick

W. Carrollton, OH

No, you don’t need to change ROMs. The 1.1

ROMs correct several minor bugs present in the

original 1.0 ROM and allow the computer to address more than just 16K of RAM.

I have the old grey Color Computer with 64K

upgrade, HJL keyboard, and Green Mountain Micro

Lowerkit II. I'm having space trouble with the internal modem. With the Lowerkit installed there isn’t enough room for the two micro-mini switches to clear the RF shield. A schematic of the Modem I would be most helpful, but if that’s not available could you label all terminals of S-1 (modem) and the installed

micro-mini switches?

C.S. Holloway

Georgetown, CA

Your letter is very confusing! l can’t find anything about an internally installed modem for the Color Computer. And the Modem I from Radio Shack (26-1175) is an external modem that you connect to the Color Computer via the serial port. (Please, when requesting help, include all the information you have on the hardware you’re writing about. If I don’t know

what the hardware is, I can’t help.)

In any case, I suggest you contact Green Mountain Micro and see if they have any suggestions to make the device fit around their Lowerkit II.

I purchased Radio Shack's replacement keyboard for my D revision Color Computer. I received a keyboard and a handful of parts, no instructions. My friendly dealer said Radio Shack would be glad to install the keyboard, but because I have heavily modified my unit, I would prefer not to do that.

Can you supply me with instructions? I have electronics experience and equipment.

Gerald Stewart

Rockbridge, OH

You should call National Parts and request the installation instructions for the replacement keyboard. In fact, the technical manual/installation instructions for any Radio Shack computer product can be ordered from National Parts. To get the correct part number for the manual you need, just add the letters MS in front of the hardware's part number. Thus, the part number for the new keyboard is MS260-3016. If you're still in doubt, call and ask the National Parts operator if you have the right number for what you want.

Radio Shack’s National Parts address is: 900 East Northside Drive, Fort Worth, Texas, 76102, 817-870-5662.

Manufacturer's Announcements and New Products

Special Announcement

Free Program

Memscan (Basic) is handy especially for programmers involved with graphics. Memscan is a memory pager utility that lets the user examine RAM in all display modes, locate and examine other programs stored in memory, examine memory allocation, and compare graphic pictures in various PMODES. 64K users can examine ROMs in the all RAM mode.

Features jump to page or address, info on current display, manual and auto movement through memory, select display mode, return to previous location/display mode, and more. Cost: Free (not freeware)—send either $1 S&H or SASE with

cassette and 40 cents postage, to NEXUS, 2601 Bridalwood Dr. #4, Knoxville, TN 37917 (CIS 71575,1706).

New Product Announcement


Wiz installs in Telewrlter·64 a new on·screen character set (the Wizard font) designed for clarity and attractiveness. The font provides true descenders and optional end·of-line markers, and is vaguely reminiscent of calligraphy in style. lt maximizes the readability of all display modes. The Wizard font may be installed each time you load Telewriter-64, or it may be permanently installed in a back-up copy of the word processor. Full instructions are included. The modification alters neither the size or operation of TeIewriter·64. Wiz works in any Color Computer, 16K-64K, cassette and disk, and is supplied on cassette for $16.95 (S&H included). Contact Nexus, 2601 Bridalwood Dr. #4, Knoxville, TN 37917 (CIS 71575,1706).

New Product Announcement

Screen Dump

SCPRNT is an assembly language screen dump for PMODE4 with a Basic driver that adds print lines to the left and right of the dumped image. This lets the image be labeled and marked externally, positioned horizontally, or simply allows text to be printed on the same page level as the image. The program also allows the dump to be halted at any of 27 levels on the screen. It is excellent for graphics. The program allows selection of a printed image 1, 2 or 3 times standard width. The user may select a white on black or black on white dump. It works with Radio Shack dot matrix printers and other comparable 7-bit graphics dot matrix printers. SCPRNT works on any Color Computer, 16-64K, cassette and disk. It is supplied on cassette for $7.00 (S&H included). Contact Nexus, 2601 Bridalwood Dr. #4, Knoxville, TN 37917 (CIS 71575,1706).