Need docs for Burroughs term

Good luck, you're going to need it... I've come across the 7811 in Canon laser printer engines, It's an 8-bit microcontroller -- it contains ROM and RAM as well as the CPU. IIRc, ther'es also an 8-channel 8-bit ADC on the chip. I can almost certianly find a pinout of said chip. The bad new is that AFAIK it only exists as a mask-programmed device, there's no EPROM or OTP version. There is the 7810, which is the ROMless equivalent (you use some of the I/O ports as an address/data bus for external program memory, something in the back of my mind says the bus is 8085-like, with the data multiplexed ont he low 8 address lines). But that's not a lot of help if you alredy have the device in an applciation cirucit that's using all the port pins. And AFAIK there was no electrical way to read out the ROM contents. OK, uncap the chip and look at the metalisation, but nothing simple like an electrical 'verify' mode. -tony