To change the NET ROM from 2532 to a 2732 on the MB1632 version 1 board, then all you should need to
a) Disconnect PIN 18 from A11 line and jumper PIN 18 to Pin 20.
b) Disconnect Pin 21 from the +5V rail and connect to the A11 Line.
Don't change anything with the !ROMSEL line unless you wish to change which ROM you boot too.
You need to keep it where it is to boot from BASIC.
If you want to do away with BASIC and Boot from the NET ROM position, you need to have a ROM there that is Bootable
I.E. Boot ROM for Disk system BN56.
If you have a later version of the MB1632 then the change is even easier. Look at the schematic for the MB1656.
1) Cut links E-F, A-B
2) Link E-D, B-C
Ernest
On the Battery Backup side, that is only needed to maintain selection and Memory in the SRAM during power down, som the system returns to where it was before power down. The system will work normally otherwise even without these parts. If in doubt with what you have fitted then lift one end of D4 to separate this circuit from the rest of the system.
Ernest
a) Disconnect PIN 18 from A11 line and jumper PIN 18 to Pin 20.
b) Disconnect Pin 21 from the +5V rail and connect to the A11 Line.
Don't change anything with the !ROMSEL line unless you wish to change which ROM you boot too.
You need to keep it where it is to boot from BASIC.
If you want to do away with BASIC and Boot from the NET ROM position, you need to have a ROM there that is Bootable
I.E. Boot ROM for Disk system BN56.
If you have a later version of the MB1632 then the change is even easier. Look at the schematic for the MB1656.
1) Cut links E-F, A-B
2) Link E-D, B-C
Ernest
On the Battery Backup side, that is only needed to maintain selection and Memory in the SRAM during power down, som the system returns to where it was before power down. The system will work normally otherwise even without these parts. If in doubt with what you have fitted then lift one end of D4 to separate this circuit from the rest of the system.
Ernest