Dwight, I'm thinking the same thing -- that it's a pretty smart system where you just have to poke a RD/*WR line like on the MP7-03.
Mike Douglas (deramp.com) has suggested it may be a Mikra-D MD-2040. He has the MD-2044, which is serial interfaced. From the schematics the data/address drivers do look very similar. There's also a note in the corner of the MD-2044 schematic that it's similar to the Intellec-8 programmer! Thanks, Jonathan ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Sunday, October 31st, 2021 at 10:09, dwight via cctalk <cctalk@classiccmp.org> wrote: > It is possible that it is run from a switch box as I see 3 ea 9602 timer > chips. That would be 1 for pulse on, one for pulse off and one for duration > of pulses. > > My timing was wrong. The duration of pulses should be 120/256 = 0.47 seconds. > This is based on the timing of programming in 2 minutes as specified. > > Dwight > > From: cctalk cctalk-boun...@classiccmp.org on behalf of dwight via cctalk > cctalk@classiccmp.org > > Sent: Sunday, October 31, 2021 6:53 AM > > To: General Discussion: On-Topic and Off-Topic Posts cctalk@classiccmp.org > > Subject: Re: Mystery 1702A(?) EPROM Programmer > > I also agree, it looks like the MP7-03 with some I/O buffering. My guess is > that the connector on the back is similar to the interface to the SIM4-01. > There would be address, data and a strobe to do the programming. > > The way it works on the SIN4 setup is that the programmer supplies the timing > for the pulses but the 4004 supplies the duration of the programming pulses. > So the programming sequence would be to hold the programming active for about > 79 milliseconds then delay long enough for pulses to stop before changing the > address and data. > > This would be a simple Arduino program. > > Hopefully the programming signal is a low so that it would be in the read > mode with nothing driving it. Do remember, the 1702A is a PMOS part and is a > hard pull up and a weaker pull down, unlike TTL. > > Dwight > > From: cctalk cctalk-boun...@classiccmp.org on behalf of Jonathan Chapman via > cctalk cctalk@classiccmp.org > > Sent: Saturday, October 30, 2021 8:03 PM > > To: Chuck Guzis ccl...@sydex.com; General Discussion: On-Topic and Off-Topic > Posts cctalk@classiccmp.org > > Subject: Re: Mystery 1702A(?) EPROM Programmer > > I assume the box is just a somewhat generic project enclosure, similar to > standard offerings from Bud, Hammond, etc. > > I'll go through the power supply tomorrow or Monday and see where I can get > with read mode. It looks like writes should be hardware timed, so that's good > news! > > Thanks, > > Jonathan > > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > > On Saturday, October 30th, 2021 at 22:52, Chuck Guzis via cctalk > cctalk@classiccmp.org wrote: > > > On 10/30/21 7:35 PM, Jonathan Chapman via cctalk wrote: > > > > > It's definitely not Intel, but I pulled the control board and traced it a > > > bit this afternoon. It seems to be very similar to the circuit used on > > > the Intel MP7-03 1702A programming module for the MCS-4/MCS-8 development > > > systems. > > > > The colors aren't right for Intel, either. The scheme looks closer to > > > > that of the Zilog MCZ. > > > > --CHuck
