HP integral , 82297a

[HP Integral serial PCB] I am very suprised there aren't internal power and ground planes, since just about every other HP computer PCB of the time was built that way. Now, IIRC, the Integral I/O cards have an ID register. Typically a '241, outputs to the data bus, inputs pilled high or low as appropriate. The idea is that the software can read the ID of each board in the machine (there is a slot-specific card select line on the connector), and work out what I/O drivers to load, etc. Obviously the card ID is somethign I would have to figure out if I was to copy it. If there are internal power/ground planes, it's not going to be possile to do that from a simple scan of the 2 visible sides of the board. IIRC (again), the Integral serial board uses a 68681 serial chip, or something similar. Strang, considering the HP9000 DIO serial board _and_ the intenral modem for the integral use 8250s... Incidentally, i have 4 Integral expansion boards. In the machine at the momemt are a 1M RAM card and the intenral Modem (uses a Roxkwell 300/1200 baud chipset). Not in the machine are the interface of the expansion box (since I have no expansion box) and a ROM/EPROM module (no ROMs in it). -tony