Locating a faulty DRAM chip

[Mangelore]

Assuming you're still able to boot the C128...

1. Start the C128 in C128 mode.

2. Start the machine language monitor with F8.

3. Fill memory with zero's with the following command (this takes a while):
    F 1C00 EFFF 00

4. Inspect the contents of memory with the following command:
    M 1C00 EFFF
    (use commodore key to slowdown, use "run stop" to stop)

5. All bytes should be set to 00; if you see bytes with values other 00
    then one of the bits is stuck at one. Use the table below to
   determine which DRAM chip is suspect:
    01 - U38
    02 - U39
    04 - U40
    08 - U41
    10 - U42
    20 - U43
    40 - U44
    80 - U45

6. If all bytes were zero, then there might be bits stuck at 0.
    Fill memory with zero's with the following command:
    F 1C00 EFFF FF

7. Inspect the contents of memory with the following command:
    M 1C00 EFFF

8. All bytes should be set to FF; if you see bytes with values other FF
    then one of the bits is stuck at zero. Use the table below to
    determine which DRAM chip is suspect:
    FE - U38
    FD - U39
    FB - U40
    F7 - U41
    EF - U42
    DF - U43
    BF - U44
    7F - U45


The above test only checked bank 0 DRAM chips. Here's the DRAM mapping for both banks.

bank  0      1
bit
0         U38    U46
1         U39    U47
2         U40    U48
3         U41    U49
4         U42    U50
5         U43    U51
6         U44    U52
7         U45    U53

Can someone please tell us how to perform a similar test for bank 1 DRAM chips?

[hydrophilic]

Wouldn't it be the same except issue command

F 10400 1FEFF 00
or
F 10400 1FEFF FF
??

[Mangelore]

Wouldn't it be the same except issue command

F 10400 1FEFF 00
or
F 10400 1FEFF FF
??

Thanks Hydrophilic. I wasn't sure if you needed to switch to that bank somehow before being able to access it using the monitor.