Clock speed of the 4004?

I knew I'd kept that 1977 Intel databook for a good reason :-)... OK... define clock speed :-) The instruction cycle is claimed to be 10.8 us. That consists of 8 clock cycles, each of 1.35us minimum, 2us maximum. But conventionally the clock was sourced from a 4201A clock generator that divided an external xtal by either 7 or 8. Common crystals were either 4MHz divided by 8 (giving the 2us cycle time, 16us instruction) or 5.185MHz divided by 7 (giving 1.35us clock cycle, 10.8us instruction). For real Intel trivia collectors, Intel even listed a 5.185 MHz crystal under the part number 4801 for this chipset. Incidentally, this data book lists the following parts in the MCS-40 family : 4040 4-bit microprocessor 4004 4-bit microprocessor 4003 10-bit shift register 4265 Programmable general-purpose I/O 4269 Programmable keyboard/display interface 4201A Clock generator 40008/4009 Standard memory interface component pair 4289 Standard memory interface 4002 320 bit RAM, 4 I/O lines 4001 256*8 ROM, 4 I/O lines 4308 1024*8 ROM, 16 I/O lines 4316 2048*8 ROM 4702A 256*8 EPROM 4801 Clock crystal I'd now like to ask a question in return. Can anyone provide me with the pinouts of the 8291/8292/8293 GPIB chips? Just a list of the 40 (or whatever) pins and their names. I don't seem to have them in any of my databooks, and I'm trying to sort out a unit which uses them > > > Sam Alternate e-mail:

-tony