So Intel's web site labels it as 108Khz, just as the 8008. See, the 8008
(from what I gather) was really a modified (although greatly modified) 4004
designed to accept data/characters, not numerical data.
Tim D. Hotze
-----Original Message-----
From: Tony Duell <ard_at_p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Monday, May 18, 1998 3:35 AM
Subject: Re: Clock speed of the 4004?
>>
>>
>> Anyone know what the clock speed of the 4004 is? Courson's web page
>> mentions it not.
>
>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:
dastar_at_siconic.com
>
>-tony
>
Received on Sun May 17 1998 - 22:43:55 BST