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Posted By

Litwr
on 2013-08-04
09:41:11
 Re: Z80 GUI: SymbOS

IMHO the quality of the best 1541's turbo are higher than for the 1551's because much more ppl worked with 1541. IMHO the perfect 1551 turbo must be 4 times faster than 1541 turbo. The best 1541 turbo use 2 lines to send data.
[Apple II] I've found nothing about disk speed at http://en.wikipedia.org/wiki/Disk_II - so it should be not too fast. However the article at Russian wiki (seek paragraph with word RWTS) contains information that Apple 2 drives are very slow and have only 140 KB free space. It also contains information about new RWTS (disk BIOS) invented at SU for 840 KB drives. It can read one track + one sector for one disk rotation! The original Apple BIOS requires 16 rotations for this. This invention was later used by USA drive producers. So if we change 1551 ROM in the mentioned way then we may significantly increase speed. I know man who may provide more information about AGAT drive bios... BTW IMHO Apple IIe is much worse than C+4. It has only one sound channel, 16 colors palette, 1MHz CPU, 140x192 graphics, 140 K drive - very poor... All Apples don't support hardware sprites. However Apple had better software and advertising.



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