[HECnet] Re: Sector interleave for RX01/2

Hi. On 2023-12-28 22:39, Robert Armstrong wrote: Sure. RSX contains the sources for the device drivers, and this is in there. Just check [11,10]DXDRV.MAC on any RSX kit. (I might have protected it on MIM, but let me know if you want to get it from there.) Anyway, the comment says: ; FUNCTIONS RECOGNIZED: ; IO.RPB - READ PHYSICAL BLOCK (MAY READ ANY SECTOR ON DISK) ; IO.WPB - WRITE PHYSICAL BLOCK (MAY WRITE ANY SECTOR ON DISK) ; IO.WDD - WRITE DELETED DATA - WRITE ANY SECTOR ON DISK ; SETTING THE DELETED DATA MARK IN SECTOR HEADER ; THE FOLLOWING TWO FUNCTION CODES OPERATE ON 256 WORD BLOCKS ; OF DATA (4 SECTORS) THE DRIVER AUTOMATICALLY INTERLEAVES ; AND SKEWS SECTORS TO OPTIMIZE THE TRANSFER OF DATA ; SO THAT A LONG READ/WRITE MAY BE DONE WITHOUT LOOSING ; A REVOLUTION OF THE DISK. THE INTERLEAVE FACTOR IS 2 ; AND THE SKEW FACTOR IS 6. ; IO.RLB - READ LOGICAL BLOCKS OF 256. WORDS ; IO.WLB - WRITE LOGICAL BLOCKS OF 256. WORDS. Also, the actual code is in function TRKSEC, starting at around line 500. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt(a)softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol