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[FRAM71] Pre-Production Batch
03-23-2015, 07:19 AM
Post: #68
RE: [FRAM71] Pre-Production Batch
thanks dave, that helps a lot. first of all, there is an error in my previous post regarding the jumper settings of J1, J2. please note corrections in red.
what i can see from your test results:
test 1)
a. the scope picture is showing !CE activity during a display blink. as a side note, it seems that there is an HPIL module attached to the HP-71B, which doesn't interfere with the test, though. leave as is.
b. because there is activity regardless of the bankswitch setting, the PADCHECK on CN2:1 is now a suspect.
test 2)
step b. activity at this point hints at J1: closed, J2:open (SYSRAM active, but should be SYSROM active)
step c. no activity at this point hints at J1:open, J2:closed (SYSROM active, but should be SYSRAM active)

so, actually two issues here: one logic (human, see my previous post for corrections in red) error, and the other one probably on the pad-checking on CN2:1.
it seems that you tested this on a 2CDCC mainframe, is that correct?
can you please confirm with the corrected jumper (J1, J2) settings:
test 2b showing no activity, and
test 2c showing activity as measured on your scope plot?

will be sending you a V431 with slightly modified pad-checking per e-mail.


hans
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Messages In This Thread
ROM Images - Dave Frederickson - 12-10-2014, 03:51 AM
IRAM vs ROM - Dave Frederickson - 12-13-2014, 06:36 PM
ROMCOPY - Dave Frederickson - 12-20-2014, 08:59 PM
[FRAM71] Bankswitching? - Hans Brueggemann - 02-07-2015, 06:55 PM
v430 beta - Dave Frederickson - 02-16-2015, 06:09 AM
RE: [FRAM71] Pre-Production Batch - cruff - 02-11-2015, 11:45 PM
v430 beta - Dave Frederickson - 02-17-2015, 05:14 AM
v430 beta - Dave Frederickson - 02-27-2015, 05:20 AM
1MByte FRAM71 - Dave Frederickson - 03-14-2015, 09:18 PM
RE: [FRAM71] Pre-Production Batch - Gene - 03-15-2015, 02:04 AM
RE: [FRAM71] Pre-Production Batch - Hans Brueggemann - 03-23-2015 07:19 AM
V501 Firmware woes - Hans Brueggemann - 04-23-2015, 07:12 PM
Eagerly awaiting mine - cruff - 04-24-2015, 12:40 AM
RE: [FRAM71] Pre-Production Batch - cruff - 04-24-2015, 12:53 PM
Received my FRAM71 today! - cruff - 04-25-2015, 07:03 PM
RE: [FRAM71] Pre-Production Batch - cruff - 04-26-2015, 12:27 PM
RE: [FRAM71] Pre-Production Batch - Erwin - 10-04-2016, 08:28 PM
MEMBUF - Dave Frederickson - 05-13-2015, 02:50 AM
FRAM71 V502 - Hans Brueggemann - 05-16-2015, 04:02 PM
RE: [FRAM71] Pre-Production Batch - Erwin - 01-02-2016, 08:13 AM
RE: [FRAM71] Pre-Production Batch - Oulan - 06-03-2015, 02:10 PM
RE: [FRAM71] Pre-Production Batch - Oulan - 06-03-2015, 03:47 PM
RE: [FRAM71] Pre-Production Batch - Oulan - 06-05-2015, 09:44 AM
RE: [FRAM71] Pre-Production Batch - Oulan - 06-08-2015, 07:13 AM
FlashPRO - Dave Frederickson - 06-11-2015, 03:42 PM
RE: [FRAM71] Pre-Production Batch - cruff - 06-13-2015, 12:04 PM
RE: [FRAM71] Pre-Production Batch - cruff - 06-15-2015, 11:22 PM
Blinkin' Lights - Dave Frederickson - 07-15-2015, 03:07 AM
FRAM71 LED - Hans Brueggemann - 07-16-2015, 11:47 AM
RE: [FRAM71] Pre-Production Batch - Andres - 01-25-2016, 10:40 PM
RE: [FRAM71] Pre-Production Batch - Erwin - 10-04-2016, 08:46 PM
RE: [FRAM71] Pre-Production Batch - Erwin - 10-04-2016, 09:04 PM



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