Bill_Moore@mindlink.UUCP (Bill Moore) (03/12/91)
I have an older ST (purchased in 1986) with an easieST memory expansion board installed with 2mb of memory. Recently it has begun to lock up with narrow vertical lines on the screen and eleven bombs. This happens when the machine has been on for at least 1 1/2 hrs. If I am able to reboot I have only 1/2 mb of memory available. I had the connections to the expansion board soldered, and that has improved the problem -- it happens less often and the machine can be on longer -- but it still happens. Any ideas?? Suggestions?? Did this ever happen to anybody else out there? Thanks in advance -- a lot!!
hojo@cbnewsb.cb.att.com (HC Johnson) (03/15/91)
In article <5116@mindlink.UUCP>, Bill_Moore@mindlink.UUCP (Bill Moore) writes: > I have an older ST (purchased in 1986) with an easieST memory expansion board > installed with 2mb of memory. Recently it has begun to lock up with narrow > vertical lines on the screen and eleven bombs. This happens when the machine > has been on for at least 1 1/2 hrs. If I am able to reboot I have only 1/2 mb > of memory available. I had the connections to the expansion board soldered, > and that has improved the problem -- it happens less often and the machine can > be on longer -- but it still happens. Any ideas?? Suggestions?? Did this > ever happen to anybody else out there? Thanks in advance -- a lot!! You probably have 1 or more bad bits in the addon memory. Remember, 1 bit is in each of the 16 chips. When the bit goes bad, so goes the programs running in that memory; and you lock up. On reboot, TOS does a memory existence test to size the machine. Your memory does not read back what TOS wrote, so the memory is truncated at .5Meg. This happened to me. I wrote a simple C program to write/read back memory starting at 0x8000 and soon found a bit being dropped. (write 0xffff to see if a bit comes back 0, then write 0x0000 to see if a bit comes back 1). In my case 1 bit was usually a 1. (it was floating). I replaced the corresponding chip and all was well. Howard Johnson ATT BELL LABS att!lzsc!hcj hcj@lzsc.att.com
S_EDELMANN@iravcl.ira.uka.de (|S| Hans Chr. Ede) (03/15/91)
In <5116@mindlink.UUCP> Bill_Moore@mindlink.UUCP writes: > I have an older ST (purchased in 1986) with an easieST memory expansion board > installed with 2mb of memory. Recently it has begun to lock up with narrow > vertical lines on the screen and eleven bombs. This happens when the machine I think it's just a contact problem. I wrote a program to find such errors and i've included it in this message. Just start the program, choose your configuration and wait until an error occurs. Then you can see which ram chip is the problem (each bit corresponds to a ram chip). Remove that chip and start the program again. If the same bit is defective, you have the right one. Then you can try exchangching it with another chip on the board. If the error is in the same bit, then it's a contact problem, and you should solder each contact of that socket again. If the error is now in the other bit, then the ram chip is defective and you should exchange it with a new one. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - I Hans Christian Edelmann (at University of Karlsruhe, Germany) I I E-Mail : s_edelmann@iravcl.ira.uka.de or uk9d@dkauni2.bitnet I - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - table !"#$%&'()*+,-./0123456789:;<=>? @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_ begin 644 ramtest.lzh M(<4M;&@Q+=X# &"0 D %O%B "U)!351%4U0N4%)'YQ?V:;&8>4<L$V ,z M;@NZ@-CVCE\BW*]KF^@;N+>S+VMIX*[K<SYY:?0LPHT%XKM803JJ4;&>!$=[y M\<]/3L>+[LP.0HSD#!71!0;RC(7)-UP(5ZWB5C[<56[9=%G3:?K().]+#;-\x MF1?I.?07GD$Z+&+YM]@+#2/DX3\P/@540N&&WW )/HA?LM /49JW"A+F<^'7w MII>(JO)_>.S]K*)V==G)E("S1U:48D\ZJ\_&(7_0QRI'F8KY 'BBY8(T5(,0v M %)'Q!_?VS#>A/"-+-QMX@'*H\$8A7/QFD=7&*-TS=Y[/!_#.$%.$#@;OF?5u ML/F[]F0WIG+K',PX([!.T7Y)@/T_?=WL *?%\8)YQ&,8FGEXNYMS"GN2&EW.t M'1Z_ R#N9U$JUO4B.OI@U\O7'ID:Z/7>SIOK O[T$ 6_D@M?K"X+#9 N+B"Ts M2L4IWN0%@$(+4ZR!\J6)MGW+I@E[\F9+B*=FBE8A]PW^AG*&KNZ=60D:A8/;r M%$;?>\%7Q:J17HSR4W"(1[@)[[5O.Z0Z:4ATQ;3IO7'3%O.G3J=-E1TJK.G0q MPZ66G2HXZ4LSJ4?KQ$S.T$S+T$SS,4SS%$S@*IFLU3/'JF>-5,U>$S5:NF>=p M;RH)?N@'#*XQZ<67KKD^S;>TU&Y+-C=\F["WK2:+8R^'T,C(04HVH/1E&B)1o ML-9P-Q9P)TG L"<#,)P,\W CFX% W JFX%>U5&EX5"GFFQZ[FUB#E6VVG.NMn M,XRT08K^<U ^,?KU"&P=QO*CM#R_L$$KEC68T0^O:RB<H_DJ4[IOLLWVGJ'0m M*'0HAI\D>MZYP:M:@G60#KU,!Y0??>4_.2R7_ UAR:6B=34\_R!@!UXV\J;/l M/IS-92LJ"*2QAEZSWV-&X??#>?-1A@(>)2MCL99FWAY@,LQA2E\_Y"1(P4I]k M$(23F/FQ".D934;'L'*5N&Q8XT,H$W58][(9=1,5 UR=#4I216,(.V^^\RZ8j MT!!\T0L ^OXUG.ZBA)H=X[GY12;;."%_?X?\\,3O3\ZWAWSE&42I(CX4D+QSi MLW?7R&6T3:3=C9Z=APQ*U9"*?U/>]V;'?3ANF^L-.^<P[09O7!VBK4R].Y/3h M$1:&[-U8Z^>5M90"X]"MYX;6^Z\G$J>"DQ)REL*4WEE-M:Q!?=A&K^UR (,-g M ':R@"!?\ 5S*K 9Y_>?]W\YHK)S8^Z:H"[H/RBFX:'!.!,/4$R:P.[)8f MU">XV!C7_([2(B%VM$CR%,F4>$HR=16AIN,2WV_9@H8$RS-7&9J[34T_B7REe DM7PJ\_G*MOD&M@.>Z@Z4WC&C[B;^'F,QUX_3%2=[7^GZ^0 d c end
Roger.Sheppard@bbs.actrix.gen.nz (03/15/91)
Distribution:world In article <5116@mindlink.UUCP> Bill_Moore@mindlink.UUCP (Bill Moore) writes: > I have an older ST (purchased in 1986) with an easieST memory expansion board > installed with 2mb of memory. Recently it has begun to lock up with narrow > vertical lines on the screen and eleven bombs. This happens when the machine > has been on for at least 1 1/2 hrs. If I am able to reboot I have only 1/2 mb > of memory available. I had the connections to the expansion board soldered, > and that has improved the problem -- it happens less often and the machine can > be on longer -- but it still happens. Any ideas?? Suggestions?? Did this > ever happen to anybody else out there? Thanks in advance -- a lot!! Try reseating the MMU, as they do get dirty contacts, also Note, that Atari now fit Clamps to hold the sides of the Sockets in.. its wise to do the same to the Glue... -- Roger W. Sheppard 85 Donovan Rd, Kapiti New Zealand...