Code listings for the I4004 or I4040

Eric The answer is no and yes. You can not use the normal RAM instructions with the 4289. Still, one can have RAM through the 4289. It would have no status RAM like the 4002s but for a program that is written to use conventional RAM through the 4289, it has no more overhead than regular 4002s, for character RAM. You'd setup a register pair as a pointer and a SRC, just like 4002s for character RAM. If you only need quick access of status RAM, you are stuck with 4002s or, create your own circuits. So, I wouldn't say yes and no, I think no and yes is the answer. I did look up to see if 4008/9 recognize the RPM. The 4040 shows WPM for both 4289 and 4008/9 but only shows RPM for the 4289. I take that to mean that the 4008/9 doesn't support the RPM, even with the 4040 processor. Dwight ________________________________________ From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Eric Smith <spacewar at gmail.com> Sent: Thursday, March 17, 2016 1:23 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Code listings for the I4004 or I4040 On Thu, Mar 17, 2016 at 1:18 PM, dwight <dkelvey at hotmail.com> wrote: I know about that; what I was asking about was whether the 4289 (or 4008/4009) could replace "normal' 4002 RAM. I think the answer is negative. I can read them. Or rather, I could if I had them. The sockets are empty.