IBM Personal Computer XT 5160
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PC-ElevATor 286 with 4 x 8 x 32 KB = 1.024 KByte (1 MByte); 2 banks a 512 KByte

tbr, 26.09.2021
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Expansion Slots
.... I/O Card ......................... IRQ ...... I/O ............ DMA ..
8 .. .................................. .......... ................ . ....
7 .. IBM Async card (COM1)............. 4......... 3F8............. . ....
6 .. QUADRAM SHORT (384KB) ............ .......... ................ . ....
5 .. FDC (IBM)......................... 6......... 3F0............. 2 ....
4 .. HDC (IBM Xebec)................... 5......... 320 ............ 3 ....
3 .. HGC GB102 (LPT1).................. 7......... 378............. . ....
2 .. .................................. .......... ................ . ....
1 .. PC-elevATor............... ....... 2......... 31C-31F......... . ....

Interrupt IRQ with I/O Address
0 .. 040 ...... System Timer ..
1 .. 060 ...... Keyboard ......
2 .. 31C-31F... PC-elevATor....
3 .. 2F8-2FF .. COM2 not used .
4 .. 3F8-3FF .. COM1 ..........
5 .. 320-32F .. HDC ...........
6 .. 3F0-3F7 .. FDC ...........
7 .. 378 ... .. LPT1 ..........

Direct Memory Access DMA
0 .. Refresh system dynamic RAM
1 .. Reserved
2 .. FDC
3 .. HDC
                                                   
Upper Memory Area (UMA): 384K (3 x 128K)
. = empty memory address (1K)
M = Hercules graphic card video RAM (2x32K);
H = IBM fixed disk, HDC (8K)
b = ROM BASIC (U29, U30, U31, U32)
R = Motherboard (MB) ROM BIOS
B = IBM BIOS (U33)

1st block (128K): Video RAM Memory (MDA)
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
0A0000: ................................................................
0B0000: MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

2nd block (128K): Special Purpose RAM Memory and Adapter ROM
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
0C0000: ................................HHHHHHHH........................
0D0000: ................................................................

3rd block (128K): Motherboard BIOS Memory
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
0E0000: RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
0F0000: RRRRRRRRRRRRRRRRRRRRRRRRbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbBBBBBBBB
------: ........................|<-U29->|<-U30->|<-U31->|<-U32->|<-U33->


PC-elevATor: UP/M

1st block (128K): Video RAM Memory (MDA)
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
0A0000: ................................................................
0B0000: MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM................................

2nd block (128K): Special Purpose RAM Memory and Adapter ROM
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
0C0000: ................................HHHH............................
0D0000: ................................................................

3rd block (128K): Motherboard BIOS Memory
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
0E0000: ................................................................
0F0000: RRRRRRRRRRRRRRRRRRRRRRRRbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbBBBBBBBB
------: ........................|<-U29->|<-U30->|<-U31->|<-U32->|<-U33->