noch anpassen; ist nicht korrekt!



IBM AT 5170, Model 319/339, Type 3, with MFM HDD
================================================================================
AST RAMpage AT with 512 KB

Bank 0             : 256K: NEC D41256C-12 
Bank 1             : 256K: Motorola MCM6256BP12
Bank 2             : none
Bank 3             : non

MAINBOARD:
Conventional memory: 2x 256K: Hitachi HM50256P-15

tbr, 19.09.2021
================================================================================

Upper Memory Area (UMA): 384K (3 x 128K)
. = 1K free RAM
H = HGC Hercules Graphics Card RAM (text and graphics)
    excluded in REMM.SYS, /X=B000-BFFF

E = EMS (1-4) frame pages (4 x 16K = 64K); REMM.SYS -> RAMpage AT card
    Strangely, you can put the EMS page frame on A0000, although this is not 
    possible according to the manual, see manual page E-8.
1 = QRAM High RAM (Region 1); (2 x 64K = 128K); QRAM.SYS

R = Motherboard ROM BIOS
h = High Memory Area (HMA); HIMEM.SYS is installed -> DOS=HIGH
u = free, but unusable in an IBM AT class PC

1st block (128K): Video RAM Memory (VGA, EGA, MDA, HGC or CGA)
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
0A0000: 1EEEEEEEEEEEEEEE2EEEEEEEEEEEEEEE3EEEEEEEEEEEEEEE4EEEEEEEEEEEEEEE
0B0000: HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

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: 1111111111111111111111111111111111111111111111111111111111111111
0D0000: 1111111111111111111111111111111111111111111111111111111111111111

+----------------------------------------------+
| Region     Area      Size      Status        |
|   1    C000 - C05E   1.5K    Used (QRAM)     |
|   1    C05F - C210   6.8K    Used (KEYB)     |
|   1    C211 - DFFF   119K    Available       |
+----------------------------------------------+

3rd block (128K): Motherboard BIOS Memory
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
0E0000: uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
0F0000: RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR

Extended Memory (64K): HMA
------: 0---1---2---3---4---5---6---7---8---9---A---B---C---D---E---F---
100000: hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

Extended Memory (XMS): up to 16 MB
110000: ................................................................
......: ................................................................
FFFFFF: ................................................................