dk_spb
Newbie level 6
I need to repair the old computer and need to understand PAL16L8 functions.
I have read it by programmer and got .jed file.
Convert .jed to .eqn file by OPAL Jr. software.
Could anybody help me to answer for few questions about part of this code
What means this code "/f18 = ... + vcc" ?. If plus means OR function - result of "+vcc" always TRUE (f18 always TRUE and /f18 always FALSR)?
What means "/f18 = i2 * /i2 * f18 * /f18". It is always FALSE?
Or this code example means "/f18 = i5 * /i7 * i8 * i11" (pairs like "* i9 * /i9" must be ignored) ??
I have read it by programmer and got .jed file.
Convert .jed to .eqn file by OPAL Jr. software.
Could anybody help me to answer for few questions about part of this code
Code:
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
What means "/f18 = i2 * /i2 * f18 * /f18". It is always FALSE?
Or this code example means "/f18 = i5 * /i7 * i8 * i11" (pairs like "* i9 * /i9" must be ignored) ??