apple Lisa2. One working!! - one to go?

On 12/11/2010 03:15 AM, terry stewart wrote: But if you had a working IIGS would you sacrifice its IWM? :-) I know you've said you're sure the I/O ROM says E8, does the sticker on the I/O board confirm this? It's very suspect to me. Also can you confirm that the floppy drive in that Lisa is a standard sony 400K one? If you take it apart, do you see only one head, and the top part of the clamp has a bit of foam? If that ROM is ok, it might well be the 800K ROM from SunRem. I'm guessing that it's either that, or it's corrupt. If either of those cases is wrong, well, you might have a new ROM that wasn't unreleased. Again, you're getting error 57, which is a timeout of the controller's self test, or a bus error during an attempt to access the controller. This has nothing to do with access to the floppy drive, but everything to do with the power on self test that 68000 does to check the 6504 is working. Unless the IWM caused the 6504 to crash, it shouldn't cause a bus error or timeout when the 68000 tries to get status from the 6504. If on poweron the 6504 is fully functional, it does a self test also. Then, it writes the results into the shared floppy RAM, and the 68000 reads this status. Unfortunately, in all cases, you get the same error 57. It might be a timeout, bus error, or an internal 6504 failure, or a RAM failure. The only clue we have is the oddball I/O ROM version. Please, check the sticker on the I/O ROM. If it says 88 on the label, either the EPROM went bad, or the I/O RAM is bad, or something went wrong that prevented the 6504 from reporting its version to the 68000. Does the sticker say E8 on it? Is there an Apple symbol on the sticker? Here's what the code looks like, all roads lead to 57 (EDISK) unfortunately, so we can't pinpoint exactly what went wrong. If you have a logic analyzer with the ability to analyze running 68000 code, and can catch the POST ROM going through this code, you might be able to see where it dies. Perhaps if you can enter Service Mode, you could look at 02AE which is a copy of the result of the 6504's self test. If this is non-zero, it's what reported the error. 02A1 is a copy of the ROM version, which should contain E8. If you can jump into the diag ROM at 00fe1136, it should attempt to see if it can talk to the floppy controller, if you get an error 57 immediately after this (the Lisa might crash without throwing an error, since your're jumping into POST code from service mode) then it's a timeout. 110C| ;---------------------------------------------------------------------------- 110C| ; Test of disk interface - ensure R/W capability to shared RAM, then 110C| ; try disable interrupts command. This test will also verify 110C| ; the results of the disk controller's own self-test (ROM and RAM test). 110C| ;---------------------------------------------------------------------------- 110C| 110C| DSKTST 110C| .IF DIAGS = 1 110C| 110C| 47FA 0078 LEA DSKVCT,A3 ;set up vector in case of bus timeout 1110| 21CB 0008 MOVE.L A3,BUSVCTR 1114| 207C 00FC C001 MOVE.L #DISKMEM,A0 ;set ptr for shared memory 111A| 111A| ; Display ROM id CHG001 111A| 111A| 7A03 MOVEQ #ROMIDROW,D5 ;set cursor ptrs CHG001 111C| 3C3C 0051 MOVE #ROMIDCOL+1,D6 ; CHG001 1120| 702F MOVEQ #'/',D0 ;preceed with / char CHG001 1122| 6100 2616 BSR DSPVAL ;display it CHG001 1126| 1028 0030 MOVE.B ROMV(A0),D0 ;read id CHG001 112A| 11C0 02A1 MOVE.B D0,IOROM ;save in low memory CHG010 112E| 7202 MOVEQ #2,D1 ; CHG001 1130| 6100 0546 BSR OUTCH ; CHG001 1134| 1134| ; Read system type CHG009 1134| 1134| 6162 BSR.S SETTYPE ;determine system type CHG029 1136| 1136| ; Check disk alive indicator 1136| 1136| 4282 CLR.L D2 ;clear for use CHG022 1138| 227C 00FC D901 MOVE.L #VIA2BASE,A1 ;set ptr to parallel port 6522 113E| 0229 00BF 0010 ANDI.B #$BF,DDRB2(A1) ;ensure bit 6 is input 1144| 203C 001C 8000 MOVE.L #DSKTMOUT,D0 ;set up timeout count for 15 secs 114A| 0811 0006 @2 BTST #DSKDIAG,IRB2(A1) ;check indicator 114E| 6606 BNE.S @3 ;skip if set 1150| 5380 SUBQ.L #1,D0 ;else loop until timeout (about 8 us per loop) 1152| 66F6 BNE.S @2 1154| 7439 MOVEQ #EDISK,D2 ;error if not set CHG022 1156| 1156| ; Try read operation and check results of self-test 1156| 1156| @3 1156| .IF DIAGS = 1 1156| 11E8 0016 02AE MOVE.B STST(A0),DSKRSLT ;get results of disk self-test CHG022 115C| 6616 BNE.S INTERR ;exit if error CHG022 115E| 115E| 4A02 @4 TST.B D2 ;previous error? CHG022 1160| 6612 BNE.S INTERR ;exit if yes CHG022 1162| 1162| ; Then try simple write operation to shared RAM 1162| 1162| 7055 MOVEQ #$55,D0 ;set up pattern RM000 1164| 1140 0002 MOVE.B D0,CMD(A0) ;try write 1168| B028 0002 CMP.B CMD(A0),D0 ;verify 116C| 6606 BNE.S INTERR ;exit if error 116E| 116E| ; Finally try a command to disable interrupts 116E| 116E| 6100 0BD6 BSR DSABLDSK ;go issue disable cmd 1172| 640C BCC.S DSKXIT ;skip if OK 1174| .ELSE 1174| .ENDC 1174| 1174| 08C7 0011 INTERR BSET #DISK,D7 ;else set disk error 1178| 4A87 TST.L D7 ;restart if in loop mode 117A| 6B90 BMI.S DSKTST 117C| 6000 021C BRA TSTCHK ;and abort further testing If you suspect that no keyboard isn't working, and your 6522's and the COP421 chips are all socketed, feel free to swap them around, or swap them from the other Lisa. 6522's are very common. Western Design Center may even sell new ones. see: http://www.westerndesigncenter.com/wdc/AN-004_W65C22S_Replacements.cfm and find the right version. Take extra care with the COP421 chip! COP421's are unique to the Lisa and can only be found on Lisa I/O boards. (COP421's from anything other than a Lisa will not work since these are microcontrollers with a bit of EPROM built in and burned in for Lisas, so only those coming from a Lisa can be used.) The COP421 handles keyboard, mouse, and the real time clock. The year on the clock has only a 15 year span. So Lisas never had a Y2K problem. :-) Their clock range expired long before 2000, I forget the exact limit, but it's probably 1994 or 1995. One of the VIA 6522s handles the keyboard (and volume + sound control), the other the parallel port (contrast + widget). Swapping the two VIA's around on the same I/O board is helpful in determining if a VIA is bad. If both VIA's are good a known working keyboard doesn't work with your 2/10, this is what you'd check on the I/O board. The Lisa actually has 3 CPU's. A 68000, a 6504, a COP421, and in the first prototypes, they also had a COP421 in the keyboard. These were later replaced with an intel chip. The Lisa 2's (not 2/10's) also had a socket for an FPU.