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1 vote

Why was the 1540 a computer in its own right?

There always has been a tradeoff to make between using discrete logic, custom chips, and microprocessors(since they existed) and some combination of these when making any component in a computer ...
scm's user avatar
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1 vote

Why was the 1540 a computer in its own right?

A lot of it comes down to history. Commodore had previously designed the 2031 and 4040 for the Commodore PET, and the 8050 (and eventually 8250) for the SuperPET. Internally, the 1540 (and 1541) was/...
Jerry Coffin's user avatar
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6 votes

Why was the 1540 a computer in its own right?

Late 1981: 6502 - 3$ (MOS for Commodore, internal prices); Typical working FDD controller chip (off-the-shelf) - 30$
Wheelmagister's user avatar
5 votes

Why was the 1540 a computer in its own right?

Basically the floppy drive contains a computer which acts as the floppy drive controller, but it also contains the "DOS" or Disk Operating System, which basically means that you don't read/...
Justme's user avatar
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22 votes
Accepted

Why was the 1540 a computer in its own right?

TL;DR: Commodore Peripherals Are Intelligent Peripherals - they need a CPU anyway. Instead of integrating peripherals with the PET, like many systems did, Commodore added a (somewhat cut down) version ...
Raffzahn's user avatar
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7 votes

How reliable is the floppy content listing information on a C64?

The directory lists file names, among others. Creative use in file names of SHIFT-SPACE (which, when LISTed, will appear as a double quote, causing an early disabling of the "quote mode" ...
TeaRex's user avatar
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13 votes
Accepted

How reliable is the floppy content listing information on a C64?

When a file is loaded, the drive will read the starting block indicated in the directory entry; if the first byte of a read block is non-zero, it will output the last 254 bytes and then read the block ...
supercat's user avatar
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