1050 Blues :(

[walter_J64bit]

My 1050 is not working right It wont format a disk but it read a disk and it boots OK

[Goochman]

I presume it wont write a disk either?

 

Thats ok, just play games then and leave the word processing to your PC

[Super-Genius!]

When I have "repeated" trouble with hardware, I find it refreshing to

run it over with my SUV. It really makes you feel good!!

[walter_J64bit]

Goochman wrote:

presume it wont write a disk either?

 

Im not going to try that at all I think it might not work or ruin a disk.

 

Super-Genius! wrote:

 

When I have "repeated" trouble with hardware, I find it refreshing to  

run it over with my SUV. It really makes you feel good!!

 

Is this before you lose at a game of M.U.L.E. ? :wink: Are when DK gets the girl?

[Nukey Shay]

Super-easy diagnosis...it's most likely that the timing is off a bit. Very easy to correct. Open up the 1050 and look inside with the door facing toward you. Near the back on the left side, there will ba a small "box" on the board that has a tiny screw on the top. This is the adjustment screw. If you have a program that can check display the timing (like Dos 2.5f, Scanalyzer, etc...boot it up. Have the TV speaker turned up. If you don't have a program, just try formatting something after turning the screw. You won't need a whole lot...just a quarter-turn or less...so be sure to mark the original position off (and in case it was adjusted the wrong direction).

[Nukey Shay]

Here's where it is on my drive (note...there are two versions of the board. Yours may be located differently. Those with 810 drives have an actual adjustment knob I believe).

 

I can't recall off-hand...but I think that the speed needs to be 288rpm (+/- 10). Faster will limit the drive to read-only, and slower will create bad sectors when you write.

[Nukey Shay]

Though you might have a problem with the write-protect switch if you are getting write-protect error codes. I dunno anything about that (besides making sure that your disks are notched, that is).

 

EDIT--here's a closeup of that tiny box:

[Nukey Shay]

Found a little Basic program to check drive speed...

(yes, I know a lot of it is redundant)

 

1 RDS=25

5 DIM BUF$(256),PROG$(20)

10 GOSUB 2000:GOSUB 1000

15 P1=PEEK(18):P2=PEEK(19):P3=PEEK(20)

20 FOR I=1 TO RDS

30 GOSUB 1000

40 NEXT I

43 Q1=PEEK(18):Q2=PEEK(19):Q3=PEEK(20)

45 BGTIME=P1*65536+P2*256+P3

50 DNTIME=Q1*65536+Q2*256+Q3

60 PRINT 3600*RDS/(DNTIME-BGTIME);" RPM"

70 GOTO10

1000 REM THIS IS THE READ SECTOR ROUTINE

1010 DCB=3*256

1030 POKE DCB+1,1

1040 POKE DCB+2,5*16+2

1050 HIADDR=INT(ADR(BUF$)/256)

1060 LOWADDR=ADR(BUF$)-HIADDR*256

1070 POKE DCB+4,LOWADDR

1080 POKE DCB+5,HIADDR

1090 POKE DCB+10,1

1100 POKE DCB+11,0

1110 A=USR(B):RETURN

1900 REM THIS ROUTINE GENERATES A

1902 REM SMALL MACHINE LANGUAGE

1904 REM ROUTINE AS FOLLOWS:

1906 REM PLA

1908 REM JSR DSKINV

1910 REM RTS

2000 B=ADR(PROG$)+1

2010 POKE B,6*16+8

2020 POKE B+1,2*16

2030 POKE B+2,5*16+3

2040 POKE B+3,14*16+4

2050 POKE B+4,6*16

2060 RETURN

 

Notes from the author:

Date: 28 Oct 1981 19:35:38 EST (Wednesday)

From: Carl D. Howe

Subject: program to measure 810 disk speed

To: info-atari at MIT-AI

 

The following is my DSKRPM program that I described in

a previous message. It is not entirely deterministic;

I assume that this is because of heterodyning between BASIC

execution and the disk rotation. However, I have not

really verified this fact; if anyone has any ideas

any ideas, please let me know.

 

Carl

cdh@BBN-UNIX

 

P.S. The proper number to get is about 292 RPM.

 

---------

 

Shorter version uses zeropage for the m/l routine and page 6 for the buffer:

 

1 R=25

2 FOR I=203 TO 207:READ J:POKE I,J:NEXT I:DATA 104,32,83,228,96

3 GOSUB 9

4 P1=PEEK(18):P2=PEEK(19):P3=PEEK(20)

5 FOR I=1 TO R:GOSUB 9:NEXT I

6 Q1=PEEK(18):Q2=PEEK(19):Q3=PEEK(20)

7 B=P1*65536+P2*256+P3:D=Q1*65536+Q2*256+Q3

8 ? 3600*R/(D-B);" RPM":GOTO 3

9 POKE 769,1:POKE 770,82:POKE 772,0:POKE773,6:POKE 778,1:POKE 779,0:J=USR(203):RETURN

 

...short enough to key in quickly if you have a problem