Patron, Заранее большое спасибо!!!!
Titus, А с дискеты загрузка? Тут ведь, понимаешь, какая закавыка, меня игры не интересуют. ;-)
Titus, пока погряз в 8" дискетах.
Относительно вариантов записи на 8" дискеты есть такая информация:
Код:There are several formats available for 8" floppy discs. RX01: This is the single density original IBM format, with 128 bytes per sector, 26 sectors per track, using tracks 1 through 76. (Track 0 was reserved for an IBM directory, and has been uselessly wasted ever since!) The sector headers and the data are both written in single density. The number of blocks available with RX01 formatting is 494. RX02: This was DEC's modification to increase storage space. This format still uses 26 sectors per track, tracks 1 through 76, but each sector, while still having its header written in single density, writes its data in double density. This doubles the available space for data to 988 blocks. RX03: When double-sided discs and drives became available, DEC did not move up to them, though other manufacturers leaped for them. Unfortunately this has led to two different formats, as there was no standard! Mark I: With this format, the disc is utilized in such a manner that side zero is exactly the same as an RX02 floppy (blocks 0 through 987), then blocks 988 through 1971 are on the other side of the floppy in the same positions as the corresponding block (less 988) on side zero. This has the advantage that a single-sided controller can still read the first half of these discs. Mark II: [I only recently learned of the existence of this format via Billy Youdelman in the USA, who sent me some apparently unreadable discs! This format has been allowed for in version 4 of DYC] This format alternates heads on each track before moving to the next track: ie starts at track 1, head 0, then goes to track 1, head 1; then track 2, head 0, track 2 head 1 and so forth. It is interesting that the initial directory blocks in these two formats are in exactly the same position on the disc, so you cannot tell which format a disc was written in by examining the directory: you have to look at one of the files stored further along the disc.
В приложении - исходник драйвера DY из РАФОС с поддержкой двусторонних дисковКод:The actual DEC RX02 dual floppy disk drive and the M8029 controller for the Qbus did not have hardware support for double sided diskettes. In addition, starting with V5.00 (if I remember correctly), DEC removed the extra code that was in the DY.MAC file from V4.00 that supported double sided hardware. So if you really want to see the code for a double- side floppy drive which is RX02 compatible, that is a good starting point (i.e. V4.00 DY.MAC from DEC - around 1980). Note however that the 1980 DY.MAC file probably has a bug or two in the double-sided code since I don't think DEC ever implemented an RX03. As far as I know, the M8029 probably supported an RX03 (maybe the one from that plotter company). In the digital interfaces handbook from 1980 at the very top of page 615, BIT 9 is the head select bit and can select the head to be used for double sided operation. DSD hardware uses the same bit.
( исходник содержит ошибки, делающие невозможным создание и использование драйвера DY для двусторонних дисков ).
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Последний раз редактировалось Patron; 02.01.2013 в 15:37.
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