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Questions tagged [coco]

For questions about the TRS-80 Color Computer, including peripherals and software.

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7 votes
1 answer
297 views

How do you implement double-buffering on a CoCo 3 320x192x16 screen in BASIC?

I was hoping someone could just share a small code snippet with all the requisite POKEs that would illustrate how this is done. I would think for someone who knows what they were doing that this is a ...
TheSentinel's user avatar
3 votes
0 answers
383 views

Do the Tandy CoCo and the Dragon 32 & 64 use all the same disk image file formats?

Tandy's TRS-80 Color Computer "CoCo" and the Dragon 32 & 64 were very similar but not clones and not the same. Floppy disk versions used totally different DOSes and disk layouts. Both ...
hippietrail's user avatar
  • 6,694
3 votes
1 answer
557 views

Loading a Tandy CoCo or a Dragon 32 machine code program from cassette with multiple "name blocks"

For the Dragon 32 and the TRS-80 Color Computer I've found two documents describing how loading from cassette tape works:Dragon 32 doc, CoCo doc. They both say that a standard program consists of a ...
hippietrail's user avatar
  • 6,694
5 votes
1 answer
157 views

Length of leader block in Coco and Dragon cassette tape header and .cas tape image file format

I've been looking into the format of .cas files for Tandy Color Computer and Dragon32 emulators. These files are almost exactly byte for byte representations of the data/audio/bit pattern of the ...
hippietrail's user avatar
  • 6,694
7 votes
2 answers
2k views

Could Tandy TRS-80 Color Computers boot from disk at all?

I'm trying to find out if any of the Tandy CoCos could boot from disk. I'm thinking the answer is no but I'm having trouble confirming it. I believe that non-disk machines booted from the standard ...
hippietrail's user avatar
  • 6,694
1 vote
1 answer
144 views

Exit NitrOS9/OS9 EDIT command without saving file

NitrOS9 is a modern clone of the original OS-9 operating system used on the coco3. Both OS-9 and NitrOS9 have an EDIT command, a line-based text editor. As far as I know, EDIT works the same in both....
Wayne Conrad's user avatar
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3 votes
1 answer
149 views

Microware OS-9 assembler warning with no message

My 6809 assembly language program for the coco3 is causing the assembler to issue a warning with no message. How can I find out why the warning is being issued? From the assembly listing, showing ...
Wayne Conrad's user avatar
  • 2,736
8 votes
1 answer
948 views

What's up with the ASxxx and the "CoCo Disk BASIC binary format"?

The ASxxxx assembler system is a multi-platform assembler that supports a lot of different CPUs, including Z80, 6800, 6502, 6809, etc. I'm intending to use it to build software for a variety of ...
cjs's user avatar
  • 26.8k
8 votes
3 answers
527 views

BASIC09 and I-Code

I only learned of BASIC09 today, and I'm trying to wrap my head around it. The manual talks about it being a compiler, but I'm not sure I see significant differences between its I-code and tokenized ...
Maury Markowitz's user avatar
22 votes
2 answers
1k views

Fate of mystery Motorola RMS graphics chipset (68486 + 68487)

I recently learned that mid 1980s, Motorola was working on a discrete graphics chipset that would be a great leap forward from its 6847 Video Display Generator and 6845 display controller. It was ...
Fedor Alexander Steeman's user avatar
10 votes
2 answers
5k views

How to connect a Tandy Color Computer to a Composite Monitor?

Ok, I'll admit I'm out of my element on this one. I'm an Atari/Commodore/Apple guy, but I have this Tandy color computer kicking around and a spare Amdek Composite monitor and I thought they would ...
Geo...'s user avatar
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10 votes
4 answers
4k views

How do Z80 Block Transfer instructions work?

I'm familiar with the Hitachi 6309's block transfer instructions (TFM). It can work as a "poor man's" DMA controller or Blitter, and is one of the things that makes the 6309 the best 8-bitter of all ...
Brian H's user avatar
  • 60.9k
8 votes
1 answer
623 views

Which memory management is easiest to program - CoCo 3 or C128/Apple //e? [closed]

As the 8-bit systems hit their peak in the mid-1980s, breaking the 64K barrier was all the rage. Commodore, Apple, Atari, and Tandy all shipped new 8-bit machines that came standard with 128K. Of ...
Brian H's user avatar
  • 60.9k
32 votes
5 answers
5k views

Does every retrocomputer and console with NTSC composite output have 'artifact color' ability?

Artifact color is heavily associated with the Apple ][, since that is the only method the machine had to produce a color display. I was looking at the fantastic demo for IBM PC + CGA, 8088MPH, and I ...
Brian H's user avatar
  • 60.9k
9 votes
1 answer
300 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?
tlindner's user avatar
  • 2,367