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· Hardware
#ibm a2000
17 messages in this thread
Does anyone know if it is possible to temporarily disble the a2088
bridgeboard to speed up the a 2000 without removing the card? I would
accept a turn on/off or reboot, I just dont want to pull the card when i
need higher speed
Huh? There is no speed loss on the Amiga side when the bridgeboard is
sitting idle. The only speed loss there might be when the brigeboard is
executing a program is that of the screen display.
PROGRAMS WHICH RAN AT A CERTAIN SPEEd on the a1000 seem much slower on my
a2000 with bridgeboard, even if I never opened a pc window. A data capture
program which is very time sensitive runs on the a1000, yet cant keep up on
the a2000 and loses data. The program involved uses the 8250 for
interrupts. any ideas?
How much memory do you have on your 2000? If you have more than the
standard 1-meg of memory, run the program 'SlowMemLast' in your
startup-sequence. The extra 512K of memory on the motherboard of the 2000 is
not true fast memory (shares bus contention with the custom chips, and
consequently is slower than add-on memory in the a1000). SlowMemLast causes
this memory to be allocated after any additional fast ram available in your
system is allocated, thus causing some software to run faster. If you don't
have more than 1 meg, SlowMemLast will do absolutely nothing for you. This
could explain your timing differences, assuming that the a1000 had expansion
memory – if not, I can't explain it.
I have a stock a2000 w 2088 no extra memory.. 30meg ibm hardcard 20 amiga/120
ibm side
With the stock 2000 (1 meg), comparisons with a stock 1000 (512K) should
be the same timing-wise. If the 1000 has extended memory, then the 1000 will
run faster in some areas (due to the faster expansion memory).
With the stock 2000 (1 meg), comparisons with a stock 1000 (512K) should
be the same timing-wise. If the 1000 has extended memory, then the 1000 will
run faster in some areas (due to the faster expansion memory).
I have a stock a2000 w 2088 no extra memory.. 30meg ibm hardcard 20 amiga/120
ibm side
How much memory do you have on your 2000? If you have more than the
standard 1-meg of memory, run the program 'SlowMemLast' in your
startup-sequence. The extra 512K of memory on the motherboard of the 2000 is
not true fast memory (shares bus contention with the custom chips, and
consequently is slower than add-on memory in the a1000). SlowMemLast causes
this memory to be allocated after any additional fast ram available in your
system is allocated, thus causing some software to run faster. If you don't
have more than 1 meg, SlowMemLast will do absolutely nothing for you. This
could explain your timing differences, assuming that the a1000 had expansion
memory – if not, I can't explain it.
PROGRAMS WHICH RAN AT A CERTAIN SPEEd on the a1000 seem much slower on my
a2000 with bridgeboard, even if I never opened a pc window. A data capture
program which is very time sensitive runs on the a1000, yet cant keep up on
the a2000 and loses data. The program involved uses the 8250 for
interrupts. any ideas?
Huh? There is no speed loss on the Amiga side when the bridgeboard is
sitting idle. The only speed loss there might be when the brigeboard is
executing a program is that of the screen display.
Are you talking about during boot up? Otherwise, the bridge takes
no CPU cycles unless you are displaying a PC screen or using one of the
shared devices like the parallel port, or a JLINKed drive. If you mean
during boot up of the system…that's easy, rename the file
janus.library.info to anything else in the expansion directory of your boot
disk. That will prevent the bridge from being configured into the system.
Then if you want start the bridge up later on…just rename that file back
to janus.library.info and do a binddrivers command.
thanks. see my message 115544. I tried what you suggested already, but in
my time-sensitive, interrupt driven application, I still wasn't able to
keep up with a data rate that is possible on the a1000. any more ideas?
thanks
Charles,
I read the other replies and agree with them, the A2000 is slower
than an A1000 w/ expansion memory…otherwise they run at the same speed.
IF you have no PC applications running…then there is no reason that
the A2000 shouldn't run the application at the same speed as a 512K A1000
Again…if your A1000 had more than 512K of RAM, then there would have been a
speed up.
If that was the case, the only fix I know of is to add more memory to
the A2000 and do what Bob suggested…run SlowMemLast at bootup time.
Charles,
I read the other replies and agree with them, the A2000 is slower
than an A1000 w/ expansion memory…otherwise they run at the same speed.
IF you have no PC applications running…then there is no reason that
the A2000 shouldn't run the application at the same speed as a 512K A1000
Again…if your A1000 had more than 512K of RAM, then there would have been a
speed up.
If that was the case, the only fix I know of is to add more memory to
the A2000 and do what Bob suggested…run SlowMemLast at bootup time.
thanks. see my message 115544. I tried what you suggested already, but in
my time-sensitive, interrupt driven application, I still wasn't able to
keep up with a data rate that is possible on the a1000. any more ideas?
thanks
Are you talking about during boot up? Otherwise, the bridge takes
no CPU cycles unless you are displaying a PC screen or using one of the
shared devices like the parallel port, or a JLINKed drive. If you mean
during boot up of the system…that's easy, rename the file
janus.library.info to anything else in the expansion directory of your boot
disk. That will prevent the bridge from being configured into the system.
Then if you want start the bridge up later on…just rename that file back
to janus.library.info and do a binddrivers command.