Questions tagged [commodore]
Commodore Business Machines and their products. Use more specific tags like [commodore-64] or [amiga] instead if appropriate.
130 questions
9 votes
1 answer
365 views
Help understanding the Commodore 64 cartridge memory use and lifecycle
I've recently become interested in creating my first C64 cartridge to host a small app I've been fooling around with. I've done some preliminary research and discovered the size (8k or 16) and memory ...
- 11k
3 votes
0 answers
159 views
What might cause my Commodore 1541 and FSD-1 disk drives to have a bus conflict
I'm seeing some strange behavior on my Commodore 1541 and FSD-1 disk drives. Both drives seemingly work fine when attached to the C64 by themselves, but if I set the FSD-1 to be device 9,10 or 11 - ...
- 11k
6 votes
1 answer
399 views
How to detect if the KERNAL load/save routine is currently active on a CBM system?
On a Commodore 64, I have a custom interrupt routine running in parallel with a main program, and I need to detect if the KERNAL is currently performing a LOAD or SAVE operation via I/O. Unfortunately,...
- 4,681
17 votes
5 answers
2k views
Unix tools for manipulating Commodore CP/M disk images
I'm looking for some (command-line) tools that can transfer host files on a Unix or Linux machine to and from Commodore .D64, .D71 and similar image files in CP/M format. The particular use case I ...
- 29.5k
5 votes
2 answers
436 views
Amiga 500 left mouse button is not working. How to diagnose and fix it?
I've recently bought a Amiga 500 (A6 board). This Amiga works perfectly and starts as it should, except for the fact that when I hover on a icon and click my left mouse button to open it, it doesn't ...
- 113
7 votes
1 answer
363 views
Commodore 128 bottom row of keys work with different shift keys
I have been playing with a Commodore 128 that I picked up but I have noticed one, what I would call, weird keyboard problem(?). If I scan on the bottom row of the keyboard every other key works with a ...
- 73
17 votes
5 answers
4k views
Why was the 1540 a computer in its own right?
The Commodore 1540 disk drive, along with its better-known successor the 1541, is a computer in its own right, with its own 6502 CPU. Why was it designed like that? It adds significant cost to the ...
- 65.3k
3 votes
0 answers
271 views
What process node enabled the 6502 to reach 2 MHz? [duplicate]
The original version of the 6502 was rated for 1 MHz, but before the end of the decade, the CPU was available in a 2 MHz version. Presumably what changed was Dennard scaling: make the transistors ...
- 65.3k