"Extended Boundary" in BIOS, setting this to 15MB is the same as 15MB Memory Hole as well. For early AMI BIOS's.
I double checked the slot pointer setting for my board:
Any system board memory from 1 MB up to
SL TPTR (slot pointer) is accessible as on-board
extended memory.
I understand this as „hole definition“
1) VLSI SCAMP 311 | 386SX25@TI486SXLC2-50@63 | 16MB | CL-GD5428 | CT2830| SCC-1 | MT32 | WDC160GB/7200/8MB | Fast-SCSI AHA 1542CF + BlueSCSI v2/15k U320
2) SIS486 | 486DX/2 66(@80) | 32MB | TGUI9440 | LAPC-I
I would try that... If you set it to a low value like 4MB then see how much extended memory (RAM) is reported... if it stops where you set it then that's the right setting.
Strangely the setting had no effect on my available memory 🙁(
1) VLSI SCAMP 311 | 386SX25@TI486SXLC2-50@63 | 16MB | CL-GD5428 | CT2830| SCC-1 | MT32 | WDC160GB/7200/8MB | Fast-SCSI AHA 1542CF + BlueSCSI v2/15k U320
2) SIS486 | 486DX/2 66(@80) | 32MB | TGUI9440 | LAPC-I