This “All in One” S-100 board request/issue comes up from time to time. With current static RAM chips and high density I/O chips it might be possible to put together a reasonable Z80 board “All in one” S100 board for a specific hardware setup. However in getting an old/new system up from scratch there are a lot more moving parts that have to work right to get a monitor on the console. Because there are many console I/O arrangements, disk controller arrangements, video arrangements etc., it’s actually easier to debug things on separate boards. If you suspect one board, you can flip it out with another similar/alternative board and try that one. A number of people may not have an interest in using a second CPU master/slave setup initially but often you will find it will occur later. Having a Z80 board that can work with greater than 64K of RAM is really useful not only for CPM3 but is debugging 16 bit CPU’s. Getting this capability and well as master slave capability, wait states, and an onboard ROM etc. on one S100 board with 74XX chips uses up a full board. You would have to go to SMT, GAL’s or CPLD’s etc. . These have their own issues. I have toyed around with the idea of an S100 “diagnostic” board that would look at and pulse a number of S100 lines instead of a Z80 board and provide back a readout, but I always seen to come back to it not being much better than analyzing signals (logic probe, scope) with a Z80 board in HALT mode or a simple loop. John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] Hi The closest to an all in one solution would be the S-100 Utility board (RAM/ROM/UART/parallel/RTC) and an S-100 Z80 CPU board. It is two boards but that is about the limit without using PALs/GALs/CPLDs. If someone wants to design new boards using denser designs they are free to do so. Thanks and have a nice day! From: "ge...@gmail.com" <gek...@gmail.com> I'm happy to do the 4mb ram and either 8088 or 8086. With the 80286 in production I'm not sure it pays to do both, and the 8088 might make more sense. The 4mb board is a nice simple solution for 8 bit processors. I can as well. I was planning to do an S-100 Bus Extender Board run...
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