Dueling HP's: 1350A vs 1351A

That's like the 1350 too. IIRC, the HP1350 contains a total of 8 PCBs : A large one on top of the chassis plate containing the RAM, DACs [1], vector geenrator, etc The slide-in interface board Another board alongside it under the chassis which contains, IIRC, part of the Z-control circuit A power supply (rectifiers, regulators, etc), mounted on top of the chassis plate at the front A backplane into which the above boards fit. It stands vertically, parallel to the front panel, behind the PSU area A daugjhterboard to the vector generator PCB containing the character generator ROMs, etc A little board on the back of the front panel containing the LEDs A little board that carries the mains swtich and connects the transformer primary winding, the voltage selector, etc/ Is that like the HP1351? The boards all have (IIRC) 01350-xxxxx part numbers. Do any of the boards in the 1351 have such numbers (which would indictate they werr likely to be originally used in the 1350, or are they all 01351-xxxxx parts? [1] In the HP1350, the top 6 bits of each of the 10 bit X and Y DACs have presets to adjust them (!). There are thus 2 rows of 6 presets on the main PCB. From their appearance, and the function they perform, they were named the 'grpaghic equaliser' by certain UK HP enthusiasts (!). -tony