Site banner
.
Home Forums Blogs Articles Photos Videos Contact FAQ                    
.
.
Wisdom Archive
Body Mind and Soul
Faith and Belief
God and Religion
Law of Attraction
Life and Beyond
Love and Happiness
Peace of Mind
Peace on Earth
Personal Faith
Spiritual Festivals
Spiritual Growth
Spiritual Guidance
Spiritual Inspiration
Spirituality and Science
Spiritual Retreats
More Wisdom
Buddhism Archives
Hinduism Archives
Sustainability
Theology Archives
Even more Wisdom
2012 - Year 2012
Affirmations
Aura
Ayurveda
Chakras
Consciousness
Cultural Creatives
Diksha (Deeksha)
Dream Dictionary
Dream Interpretation
Dream interpreter
Dreams
Enlightenment
Essential Oils
Feng Shui
Flower Essences
Gaia Hypothesis
Indigo Children
Kalki Bhagavan
Karma
Kundalini
Kundalini Yoga
Life after death
Mayan Calendar
Meaning of Dreams
Meditation
Morphogenetic Fields
Psychic Ability
Reincarnation
Spiritual Art, Music & Dance
Spiritual Awakening
Spiritual Enlightenment
Spiritual Healing
Spirituality and Health
Spiritual Jokes
Spiritual Parenting
Vastu Shastra
Womens Spirituality
Yoga Positions
Site map 2
Site map
.

Commodore 1541 - Copy protection by read error

A Wisdom Archive on Commodore 1541 - Copy protection by read error

Commodore 1541 - Copy protection by read error

A selection of articles related to Commodore 1541 - Copy protection by read error

More material related to Commodore 1541 can be found here:
Main Page
for
Commodore 1541
Index of Articles
related to
Commodore 1541
Index of Articles
related to
Commodore 1541 - Copy pro...
Commodore 1541, Commodore 1541 - Commodore's successor products, Commodore 1541 - Copy protection by read error, Commodore 1541 - Introduction and early problems, Commodore 1541 - The drive head misalignment issue, Commodore 1541 - The serial computer interface, Commodore 1541 - Versions and third-party clones

ARTICLES RELATED TO Commodore 1541 - Copy protection by read error

Commodore 1541 - Copy protection by read error: Encyclopedia II - Commodore 1541 - Copy protection by read error

Early copy prevention schemes deliberately introduced read errors on the disk, the software refusing to load unless the correct error message was returned. The general idea was that the inbuilt disk copy command was incapable of copying the errors. When one of these errors was encountered, the disk drive (as do all disk drives) would attempt one or more re-read attempts after first resetting the head to track zero. Few of these schemes had much deterrent effect, as various software companies soon release ...

See also:

Commodore 1541, Commodore 1541 - Introduction and early problems, Commodore 1541 - Versions and third-party clones, Commodore 1541 - The serial computer interface, Commodore 1541 - Copy protection by read error, Commodore 1541 - The drive head misalignment issue, Commodore 1541 - Commodore's successor products

Read more here: » Commodore 1541: Encyclopedia II - Commodore 1541 - Copy protection by read error

Commodore 1541 - Copy protection by read error: Encyclopedia II - Commodore 1541 - The serial computer interface

The 1541 used a bit-serial version of the IEEE-488 interface, the speedier parallel version of which was used on Commodore's earlier drives for the PET/CBM range of personal/business computers. To ensure a ready supply of inexpensive cabling for its home computer peripherals, Commodore chose standard DIN connectors for the serial interface. Disk drives and other peripherals such as printers were connected to the computer via a daisy-chain schem ...

See also:

Commodore 1541, Commodore 1541 - Introduction and early problems, Commodore 1541 - Versions and third-party clones, Commodore 1541 - The serial computer interface, Commodore 1541 - Copy protection by read error, Commodore 1541 - The drive head misalignment issue, Commodore 1541 - Commodore's successor products

Read more here: » Commodore 1541: Encyclopedia II - Commodore 1541 - The serial computer interface

Commodore 1541 - Copy protection by read error: Encyclopedia II - Commodore 1541 - The drive head misalignment issue

The drive-head mechanism was notoriously easy to misalign, and had a tendency to make a 'machine-gun' rattle when out of alignment or when formatting a new disk. Some people even wrote code to vibrate the head at different frequencies to play simple tunes such as Amazing Grace. The most common cause of the 1541's drive head knocking and subsequent misalignment, however, was copy prevention schemes on commercial software. The main cause of the problem was that the disk drive itself did not feature any means of detecting when the ...

See also:

Commodore 1541, Commodore 1541 - Introduction and early problems, Commodore 1541 - Versions and third-party clones, Commodore 1541 - The serial computer interface, Commodore 1541 - Copy protection by read error, Commodore 1541 - The drive head misalignment issue, Commodore 1541 - Commodore's successor products

Read more here: » Commodore 1541: Encyclopedia II - Commodore 1541 - The drive head misalignment issue

Commodore 1541 - Copy protection by read error: Encyclopedia II - Commodore 1541 - Versions and third-party clones

There were two versions of the 1541 mechanics. Early models used a drive mechanism made by Alps Electric, distinguishable by its push-down drive door. Later models utilized a drive mechanism manufactured by Newtronics (Mitsumi), which used a lever release. All but the very earliest 1541s can use either the Alps or Newtronics mechanism. Visually, the first models, of the VIC-1541 denomination, had an off-white color like the VIC-20 and VIC-1540. Then, to match the look of the C64, CBM changed the d ...

See also:

Commodore 1541, Commodore 1541 - Introduction and early problems, Commodore 1541 - Versions and third-party clones, Commodore 1541 - The serial computer interface, Commodore 1541 - Copy protection by read error, Commodore 1541 - The drive head misalignment issue, Commodore 1541 - Commodore's successor products

Read more here: » Commodore 1541: Encyclopedia II - Commodore 1541 - Versions and third-party clones

Commodore 1541 - Copy protection by read error: Encyclopedia II - Commodore 1541 - Introduction and early problems

Priced at under US$400 at its introduction, the 1541 became widely popular. Although expensive by today's standards, a C64 plus a 1541 cost about $900, while an Apple II with no disk drive cost $1395. The demand caught Commodore by surprise, who struggled to produce the drive in adequate quantities. Failure rates on the 1541 initially were very high, and the drives were virtually impossible to find. The lead editorial in the December 1983 issue of Compute!'s Gazette lamented that of seven drives the magazine had in its editorial offices, four had failed. Eventually the problems subsided ...

See also:

Commodore 1541, Commodore 1541 - Introduction and early problems, Commodore 1541 - Versions and third-party clones, Commodore 1541 - The serial computer interface, Commodore 1541 - Copy protection by read error, Commodore 1541 - The drive head misalignment issue, Commodore 1541 - Commodore's successor products

Read more here: » Commodore 1541: Encyclopedia II - Commodore 1541 - Introduction and early problems

More material related to Commodore 1541 can be found here:
Main Page
for
Commodore 1541
Index of Articles
related to
Commodore 1541
Index of Articles
related to
Commodore 1541 - Copy pro...
.
  » Home » » Home »