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Questions tagged [color-computer]

For questions about hardware, peripherals and software specific to TRS-80 Color Computers.

4
votes
1answer
334 views

Can someone help me get xROAR to read files? (M6809/TRS-80 ColorComputer)

I implemented a Forth interpreter or the TRS-80 Color Computer (M6809) way back in the 1980s, and I've been trying to figure out how to get it loaded into an emulator to test some parts of the ...
8
votes
2answers
203 views

Is NitrOS-9/OS-9 a preemptive multitasking environment?

The NitrOS-9 docs say it is a process based multitasking environment, and that it is a real time OS (RTOS). But I'm not sure if that means it's preemptive (OS takes control away from a program/process ...
13
votes
1answer
474 views

Calculating the time for a CPU cycle

As a learning exercise, I'm writing an emulator for the 6809 CPU. I'd like to simulate the speed of the CPU. I know the Motorola 6809E runs at 0.895 MHz and 1.79 MHz on the Color Computer 3. How do I ...
14
votes
1answer
902 views

What is the CoCo “Head Banger bug” and what is the “fix”?

I remember that horrible racket coming from the floppy disk when I first used it after started my CoCo, and that it was called the "Head Banger bug". I remember that it was due to a quick-n-nasty bit ...
8
votes
1answer
99 views

Digisector DS-69 video digitizer

The DS-69 was a cartridge you could plug into the computer to digitize a composite video source. It fully supported writing images to floppy disks. Can the DS-69 (A or B) be used with Y-Cable? The ...
13
votes
2answers
572 views

The Tandy/TRS-80 Multipack Interface (MPI)

A popular, but, much maligned bus expansion device for the CoCo was the venerable MPI. There were several companies who made bus expasion devices for the CoCo, however, this question is related ...
9
votes
1answer
203 views

What are the advantages of NitrOS-9 over OS-9?

Microware released the versions of the OS-9 DOS for the CoCo. A few years later, former employees (I believe) released NitrOS-9. Both appear to be multiuser/multi-tasking OS's. What are the ...
3
votes
2answers
154 views

Breaking the CoCo 3 32K Cartridge Barrier

What is the max size for a cartridge based app on the Coco 3? I believe the Coco 1 & 2 cartridge maxes at 16K, while the Coco 3 is 32K. However, I know there have been cart based games for the ...
8
votes
1answer
216 views

Cleaning membrane keyboards

I have a 3003b CoCo 1 (the white one) with the melty keyboard. A few of the keys do not work. On a few of them, there appears to be a slimy substance that I've cleaned from the surface. The badge on ...
7
votes
2answers
107 views

Disto Super Controller II

A popular third party floppy disk controller for the Color Computer was the Super Controller II from Disto. It's main feature was a no-halt mode. Why was this desirable? How did the no-halt mode work?
18
votes
2answers
567 views

Color BASIC RND function not so random

The RND() function for random numbers appears to give the same results each time the computer is reset. How do I seed the random number generator with a random number?
7
votes
1answer
82 views

CoCo Max Mouse Cartridge

The program CoCo Max came with a cartridge. The cartridge had a mouse/joystick port. How did the CoCo Max Analog to Digital cartridge work? Is it possible to use the device in my own software?
6
votes
1answer
85 views

Extended Color BASIC TIMER Function

How does the TIMER function work in Extended Color BASIC? How does the number keep incrementing even when the computer appears to be doing nothing?
6
votes
3answers
329 views

What are the options for installing a 6309 in a TRS-80/Tandy Color Computer

The Hitachi 6309E CPU is a direct replacement for the 6809E in the CoCo. What are the options to upgrade to this processor?
9
votes
1answer
279 views

Differences in disk storage between systems

Coming from the TRS-80/TandyColor Computer lines, I had always heard of how slow some other systems disk storage were, regarding data transfer rates, etc... The CoCo lines disk storage was pretty fast ...
11
votes
2answers
573 views

Expansion port on the Color Computer

The Color Computer has an expansion port. What is the pin out? What are the kinds of devices that can be used with it? How was the Multi-Pak involved?
11
votes
1answer
292 views

What format is used for CoCo cassette tapes?

Color Computer machines initially used audio cassette tapes for storage. How was the data stored? What was the maximum bit rate?
10
votes
1answer
169 views

How do I change the CoCo 3 color palette before running a Color Computer ROM Pak?

The Radio Shack game Wildcatting uses the wrong color set when being played on a Color Computer 3 with an RGB monitor. How can I choose the correct color set before this game automatically executes?