Ramvantage! AST Part Number 202058-001
The Ramvantage is a memory expansion adapter for the IBM PC/AT and 100%
compatibles running at a speed of 8MHz. The Ramvantage can be configured from
128K to 3072K of memory using industry standard 64K or 256K dynamic RAM chips
with a speed rating of at least 120NS. The memory on the Ramvantage can be
used to bring conventional memory to it's 640K maximum, and to add extended
linear memory to your AT or compatible. The Ramvantage does not support LIM,
EMS, or EEMS expanded memory.
SWITCH SETTINGS - SWITCH BLOCK 1
MEMORY INSTALLED ON RAMVANTAGE
NUMBER OF
BANKS INSTALLED
ON RAMVANTAGE BNK1 BNK2 BNK3 BNK4 BNK5 BNK6 SW1 SW2 SW3 SW4 SW5
-------------- ---- ---- ---- ---- ---- ---- --- --- --- --- ---
1 (128K) 128K OFF OFF OFF OFF ON
1 (512K) 512K OFF OFF ON OFF ON
2 (256K) 128K 128K OFF OFF OFF ON OFF
2 (640K) 128K 512K ON OFF OFF OFF OFF
2 (1024K) 512K 512K OFF ON OFF OFF OFF
3 (384K) 128K 128K 128K OFF OFF OFF ON ON
3 (768K) 128K 128K 512K ON OFF ON OFF ON
3 (1152K) 128K 512K 512K ON OFF OFF OFF ON
3 (1536K) 512K 512K 512K OFF ON OFF OFF ON
4 (512K) 128K 128K 128K 128K OFF OFF ON OFF OFF
4 (896K) 128K 128K 128K 512K ON ON OFF OFF ON
4 (1280) 128K 128K 512K 512K ON OFF ON ON OFF
4 (1664) 128K 512K 512K 512K ON OFF OFF ON OFF
4 (2048) 512K 512K 512K 512K OFF ON OFF ON OFF
5 (640) 128K 128K 128K 128K 128K OFF OFF ON OFF ON
5 (1024) 128K 128K 128K 128K 512K ON ON ON OFF OFF
5 (1408) 128K 128K 128K 512K 512K ON ON OFF ON OFF
5 (1792) 128K 128K 512K 512K 512K ON OFF ON ON ON
5 (2176) 128K 512K 512K 512K 512K ON OFF OFF ON ON
5 (2560) 512K 512K 512K 512K 512K OFF ON OFF ON ON
6 (768) 128K 128K 128K 128K 128K 128K OFF OFF ON ON OFF
6 (1152) 128K 128K 128K 128K 128K 512K ON ON ON ON OFF
6 (1536) 128K 128K 128K 128K 512K 512K ON ON ON OFF ON
6 (1920) 128K 128K 128K 512K 512K 512K ON ON OFF ON ON
6 (2304) 128K 128K 512K 512K 512K 512K ON ON OFF OFF OFF
6 (2688) 128K 512K 512K 512K 512K 512K ON OFF ON OFF OFF
6 (3072) 512K 512K 512K 512K 512K 512K OFF ON ON OFF OFF
NOTE: Each bank can accomodate eighteen 64K or 256K DRAM chips. If
64K chips (128K banks) are used, they must occupy the lower
numbered banks, as in the above switch summary.
SW1-6 - N/A
SW1-7 - N/A
SW1-8 - Parity check (Recommend "ON" at all times)
SWITCH BLOCK 2
MEMORY STARTING ADDRESS
START ADDRESS SW1 SW2 SW3 SW4 SW5 SW6 SW7
------------- --- --- --- --- --- --- ---
256K ON ON ON ON ON OFF ON
512K ON ON ON ON OFF ON ON
1024K ON ON ON OFF ON ON ON
1152K ON ON ON OFF ON ON OFF
1280K ON ON ON OFF ON OFF ON
1408K ON ON ON OFF ON OFF OFF
1536K ON ON ON OFF OFF ON ON
1664K ON ON ON OFF OFF ON OFF
1792K ON ON ON OFF OFF OFF ON
1920K ON ON ON OFF OFF OFF OFF
2048K ON ON OFF ON ON ON ON
2176K ON ON OFF ON ON ON OFF
2304K ON ON OFF ON ON OFF ON
2432K ON ON OFF ON ON OFF OFF
2560K ON ON OFF ON OFF ON ON
2688K ON ON OFF ON OFF ON OFF
2816K ON ON OFF ON OFF OFF ON
2944K ON ON OFF ON OFF OFF OFF
3072K ON ON OFF OFF ON ON ON
4096K (4MB) ON OFF ON ON ON ON ON
5120K (5MB) ON OFF ON OFF ON ON ON
6144K (6MB) ON OFF OFF ON ON ON ON
7168K (7MB) ON OFF OFF OFF ON ON ON
8192K (8MB) OFF ON ON ON ON ON ON
9216K (9MB) OFF ON ON OFF ON ON ON
10240K (10MB) OFF ON OFF ON ON ON ON
11264K (11MB) OFF ON OFF OFF ON ON ON
12288K (12MB) OFF OFF ON ON ON ON ON
13312K (13MB) OFF OFF ON OFF ON ON ON
14336K (14MB) OFF OFF OFF ON ON ON ON
15360K (15MB) OFF OFF OFF OFF ON ON ON
The above list of addresses is not complete. After the 3072K address,
we have listed the settings for every megabyte only. Switches 5,6 & 7
determine the addresses between. If you are unable to extrapolate the
correct starting address from the above information, leave a question
on the BBS.
NOTE: The "STARTING ADDRESS" is not the same as "MEMORY INSTALLED IN
SYSTEM". Because of the reserved rom area residing between
A0000h and 100000h, extended memory has a linear starting address
of 1024K.
In simple terms, if your system has more than 512K, the actual
starting address is equal to total system memory plus 384. Some
examples:
SYSTEM STARTING
MEMORY ADDRESS
------ -------------------
256K 256K
512K 512K
640K 1024K (640 + 384)
1024K 1408K (1024 + 384)
3328K 3712K (3328 + 384)
SWITCH BLOCK LOCATIONS
+---------------------------------------------------------------+
| +---------+ | +---
| |SW1 | +-+
| +---------+ | |
| +---------+ | |
| |SW2 | | |
| +---------+ | |
| | |
| | |
| | |
| +-+
+----------------------------------+ +-+ +----+ |
+--------+ +------------+ |
|