26591 17APR87-2224 General Information steprates From: TERMITE To: MARTYGOODMAN
Can you tell me how to set step rates in RS 1.1. Ram mode of course.
2 comments to steprates
26606 18APR87-0049 General Information RE: steprates (Re: Msg 26591) From: GREGL To: TERMITE
Read a few messages back as Don Hutchison just dropped the same thing to Rick Adams.
26619 18APR87-0231 General Information RE: steprates (Re: Msg 26591) From: MARTYGOODMAN To: TERMITE
At locatins D613, D7C0, and D816 are, respectively, the constants for head step in the format routine, return head to track zero in the read/write sector routine, and the step head in the read/write sector routine. These constants will be in vanilla Disk 1.1 (step rate set at 30 ms) 53, 3, and 17 (hex) respectively. Now, the Last Two Bits of each of those numbers in those locations specifies the step rate as follows: 00 = 6 ms step rate 01 = 12 10 = 20 11 = 30
That is, to set all three constants to reflect a 6 ms step rate, set them to 50,00, and 14 (hex) respectively.
For 12 ms, set them to 51, 1, and 15 respectively (again hex!).