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- WINDOWS 7 LOADER EXTREME EDITION 2011 INSTALL
- WINDOWS 7 LOADER EXTREME EDITION 2011 SERIAL
- WINDOWS 7 LOADER EXTREME EDITION 2011 SOFTWARE
- WINDOWS 7 LOADER EXTREME EDITION 2011 CODE
- WINDOWS 7 LOADER EXTREME EDITION 2011 SERIES
Several popular Commodore magazines published type-in fast loading software. This way, the user benefited from the fast loader without having to buy or know about a dedicated fast-loader product.
WINDOWS 7 LOADER EXTREME EDITION 2011 INSTALL
The user would load a small "stub" program from the disk with the standard slow routines, which would then install faster transfer routines in both the computer and the drive before proceeding to load the rest of the program at high speed. Many commercial programs for the C64, especially games, contained their own fast-loading routines on the distribution media. Whereas the ARMK6 fastloader was compatible with most software, The Final Cartridge III was known to crash often, so programs had to be loaded in normal C64 mode, deactivating the cartridge, making it more or less useless.
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Its Warp loader is 25 times faster, but programs can only be loaded with a loader saved to disk when the cartridge is not present. The cartridge, Action Replay MK6 RAM loader loads a 202 block program in around 9 seconds.
WINDOWS 7 LOADER EXTREME EDITION 2011 SOFTWARE
While these were more difficult to install, they offered greatly increased compatibility, being almost invisible to software running on the machine.
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A few commercial fast loaders, most notably CMD's JiffyDOS, were not cartridge-driven but instead replaced the KERNAL ROM in the C64 and the DOS ROM in the 1541. The Final Cartridge III was perhaps the most successful of this genre. Some fast loader cartridges were very sophisticated, incorporating a reset button, "freeze" capabilities, and a simple onboard GUI. Machine language monitors, disk editors, and various convenience commands for Commodore BASIC were also common additions. An on-board implementation of Commodore's DOS Wedge was included in most fast loader cartridges. Most fast loader cartridges also incorporated other features to increase ease of use. In the United States, probably the most popular such cartridge was the Epyx FastLoad. Various software companies released fast loaders for the C64, usually in cartridge form. Others were simply more efficient in I/O and file handling, offering marginal to good improvement. This technique was used for a few of the many fast-load systems made (such as JiffyDOS). Depending on the exact nature of the routines used, the loading speed could be improved by as much as a factor of five.
WINDOWS 7 LOADER EXTREME EDITION 2011 CODE
Next, the fast loader would transfer the necessary code into the drive RAM and order its execution, then receive the file sent by the altered transfer code. A fast loader would generally "wedge" itself into the LOAD vector at $0330, thus intercepting any calls to the KERNAL LOAD routine. Some fast loaders disabled interrupts and blanked the screen for this reason. On the C64, this required very careful timing to avoid interference from interrupts and from the VIC-II graphics chip, which could "steal" CPU cycles. Moreover, this transfer method allowed two bits to be sent simultaneously, one over the standard DATA line and one over the CLK line (which was normally used to perform the handshaking). Since the CPU in the C64 ran at approximately the same speed as that in the 1541 disk drive, it was sufficient to synchronize only at the beginning of each byte, rather than at each individual bit.
WINDOWS 7 LOADER EXTREME EDITION 2011 SERIAL
Soon after the C64's release, some astute programmers realized that Commodore's bit-banging serial KERNAL routines were unnecessarily sluggish. Only at the introduction of the Commodore 128 computer and the Commodore 1571 disk drive was the original plan put into action and a hardware shift register was used, reducing the need for special fast loaders. Because of the transfer protocol, the Commodore 15 disk drives soon gained a reputation for extreme slowness. Commodore chose not to redesign the 1541 hardware, also in order to retain backward compatibility with VIC-20 peripherals this however came at the expense of speed. Īlthough the C64 replaced the 6522 VIA with two 6526 CIA chips, which did not suffer from this bug, the companion 1541 disk drive still had a 6522 VIA. As a result, the KERNAL ROM routines were hastily rewritten to transfer a single bit at a time, using a slow software handshaking protocol. However, hardware bugs were discovered in the 6522 that prevented this function from working consistently. The serial bus was intended to be nearly as fast as its predecessor, due to the use of the 6522 VIA as a hardware shift register on both the drive and computer.
WINDOWS 7 LOADER EXTREME EDITION 2011 SERIES
While the earlier Commodore PET series had used an industry-standard IEEE-488 parallel bus, this was replaced with a custom Commodore serial bus on the VIC-20. This discrepancy was most pronounced on the Commodore VIC-20 and 64.
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Fast loaders came about because of a discrepancy between the actual speed at which floppy drives could transfer data and the speed that was provided by the operating system's default routines.