Remove two wait states for a general speedup. Works well with a 68040 and with the 040-060 adapter from Mozart & Matze
- Five new sockets
- Three new Gal 22V10 (10ns)
- Two new Gal 16V8 (7ns)
21 euros including Priority shipping in gift on my Paypal
What is it ?
It's a freeware firmware upgrade by SpeedGeek for A3640 owners seeking a
performance boost. The new state machine logic eliminates 2 extra wait states
from every A3640 bus cycle so your 68040 can access the A3000/A4000
motherboard resources at full speed. This logic has been tested at clock
speeds from 25-50 MHz*. It works with either a 1x or a 1/2x clocked
motherboard (other mods are required for a 1/2x clocked motherboard).
How much faster will my A3640 be ?
It's hard to quantify but you can expect Fast memory and ROM speeds to
improve by 2-3 MB/sec. Chip memory, Zorro Bus and Custom chips will
probably have < 1 MB/sec increase. Your mileage will vary with clock
speed, ROM and RAMSEY speed settings, etc.
*The new U207 and U208 were tested by apollo630
since they were created to avoid cut and jumper mods on the originals. If you
don't want to use them then cut the trace on U207 pin 9 and solder jumper it
to pin 10. Also, cut the trace on pin 3 U208 and jumper it to GND or a pull up
resistor if you have the inverted version (from the old EAB archive).
(U207 is the IC with 1 white dot)
(U205 is the IC with 2 white dots)
(U204 is the IC with 5 white dots)
(U203 is the IC with 3 white dots)
(U208 is the IC with 4 white dots)
