Found these inside a non-working 71B

[rprosperi]

(03-12-2018 05:20 PM)rprosperi Wrote:  In a normal machine (bank 4 is wired to daisy chain to the HP-IL port) the RAM banks are 0.00, 0.01, 0.02 and 0.03, (.04 is used by HP-IL but not shown) and then HP-IL is 0.05. If you add a RAM chip in between, I don't know if that one becomes 0.04 and 0.05 and 'pushes' the HP-IL port numbers up, or if it gets added as 0.06, but SHOW PORT should tell you this.

(03-12-2018 05:27 PM)Dave Frederickson Wrote:  If in the Port 0 daisy chain, as illustrated above, the 64k RAM will be configured as Ports 0.04 and 0.05. If the HP-IL module is installed, the HP-IL Mailbox should be configured as Port 0.06 and the ROM at Port 0.07.

Ok, so that answers that; I wasn't sure if the MB and IL ports are pushed up or retained during config. Thanks for clarifying that.