Can you identify this 8032 add-on board?

[Tdillon]

 

[Tdillon]

And these switches on the side.

 

[anti77]

Seems like a MICROTECH "Spacemaker II" clone.

901472-04 is a printer ROM, given away for free by Commodore, I belive Visicalc used it to check for "licensing".

 

[Hugo Holden]

The 74LS138 is a 3 line to 8 line decoder, so just using two of its inputs it could select one of the four ROMs, and its outputs are active low and suited to ROM selecting. It looks like there are pullups, so I would guess that the switches ground these, have a combination of 4 states to select which ROM is active. Possibly also, one the active low G2 inputs on that 74LS138 is connected to the enable pin on the ROM socket where it plugs onto the main pcb. So that, depending on the state of the switches, one of the four ROMs on this add on board gets selected when the ROM socket on the main board is selected. It looks like a useful add on.

 

[AndyG]

I think it’s a rom expansion board attached to $9000 and $A000 …. The 901472-04 rom looks like the protection rom used for visicalc (they used a printer rom). Normally the commercial version is painted over black.

The board doubles the number of roms.