On 7/28/2020 11:33 PM, Brent Hilpert via cctalk wrote: > > On 2020-Jul-28, at 6:40 PM, Jay Jaeger via cctech wrote: > >> On 7/28/2020 1:43 PM, Brent Hilpert via cctech wrote: >>> >>> Per the OP's machine, the early HP21xx machines were based on CTµL, for >>> which the main supply is +4.5V. >>> DTL and TTL chips in these machines ran off that 4.5 supply. >>> >> >> The DTL I referred to in my posting are in a third-party (IOMEC) disk >> controller, not the HP 2114 CPU. > > Oh, I take it you mean in a separate chassis with it's own power supply then. > (I thought you were referring to the interface boards in the CPU chassis). >
Yup. JRJ
