chip p4 PAL16L8
i1=1 i2=2 i3=3 i4=4 i5=5 i6=6 i7=7 i8=8 i9=9 GND=10 i11=11 o12=12
f13=13 f14=14 f15=15 f16=16 f17=17 f18=18 o19=19 VCC=20
equations
/f18 = i2 * /i2 * i1 * /i1 * i3 * /i3 * f18 * /f18 * i4 * /i4 * f17 * /f17
* i5 * f16 * /f16 * i6 * /i6 * f15 * /f15 * /i7 * f14 * /f14
* i8 * f13 * /f13 * i9 * /i9 * i11
+ vcc
+ vcc
+ vcc
+ vcc
+ vcc
+ vcc
f18.oe = gnd
I'm glad I'm not the only one that thinks this made no sense. I've never seen a readback part with equations that looked like that. I'm wondering if the original design was modified to disable that output for some reason and hence the readback of all those +vcc terms. I remember doing stuff like that when you didn't want to waste another OTP part to try a possible fix before changing your source file.The equations make no sense.
Maybe the part is defective, read protected, wrong .jed to .eqn ....
May be. I have used National Semiconductor's Opal Jr. (from end of this page http://www.brouhaha.com/~eric/retrocomputing/mmi/palasm/).Maybe your conversion SW is mangling the results.
Thank you very much. Security fuse was a 1st question for meIf your devices are read protected they should show all 1's or 0's (0 I think) so it doesn't seem like they have had their fuse blown
>jedpal.exe p4.jed -dev 16L8
PALASM4 JEDC - MARKET RELEASE 1.5 (7-10-92)
(C) - COPYRIGHT ADVANCED MICRO DEVICES INC., 1992
|> ERROR J150
Input file P4.JED terminated prematurely.
No Boolean equation design file is created.
L0 00000000000000100000000000001000*
now is
/o19 = i2 * /i2 * i1 * /i1 * i3 * /i3 * f18 * /f18 * i4 * /i4 * f17 * /f17
* i5 * /i5 * f16 * /f16 * i6 * f15 * /f15 * i7 * /i7 * f14 * /f14
* i8 * /i8 * f13 * /f13 * /i9 * i11 * /i11
+ i2 * /i2 * i1 * /i1 * i3 * /i3 * f18 * /f18 * i4 * f17 * /f17
* i5 * /i5 * f16 * /f16 * i6 * /i6 * f15 * /f15 * i7 * /i7 * f14
* /f14 * i8 * /i8 * f13 * /f13 * /i9 * i11 * /i11
after inversion
/o19 = /i6 * i9 + /i4 * i9
--------------------------------------
and
L96 11111111111111111111111111111111*
now is +vcc
must be nothing (all zeroes)
/o19 = /i6 * i9
+ /i4 * i9
o19.oe = f16 * i9
/o18 = /i5 * i7 * /i8 * /i11
o18.oe = vcc
/o17 = i5 * /i7 * /i8 * /i11
o17.oe = vcc
/f16 = vcc
f16.oe = i4 * i6
/o15 = /i5 * /i7 * /i8 * /i11
o15.oe = vcc
/o14 = i1 * /i3
+ /i1 * i3
o14.oe = vcc
/o13 = /i2 * /i3
+ i2 * i3
o13.oe = vcc
/o12 = vcc
o12.oe = /f16
chip p13 PAL16L8
i1=1 i2=2 i3=3 i4=4 i5=5 i6=6 i7=7 i8=8 i9=9 GND=10 i11=11 o12=12 f13=13 f14=14 f15=15 o16=16 f17=17 f18=18 o19=19 VCC=20
equations
/f18 = i1
f18.oe = vcc
/o16 = /f18
o16.oe = vcc
.....
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