TANDY/RADIO SHACK
4100 MT
Processor | 80486SX/ODP486SX/80487SX/80486DX/80486DX2/ODP486DX2 |
Processor Speed | 25/33/50(internal)/66(internal)MHz |
Chip Set | Unidentified |
Video Chip Set | ATI |
Maximum Onboard Memory | 64MB |
Maximum Video Memory | 2MB |
Cache | 64/256KB |
BIOS | Unidentified |
Dimensions | 330mm x 218mm |
I/O Options | Floppy drive interface, IDE interface, VGA feature connector |
NPU Options | None |

CONNECTIONS | |||
Purpose | Location | Purpose | Location |
IDE interface | J22 | Floppy drive interface | J24 |
VGA feature connector | J23 | ||
USER CONFIGURABLE SETTINGS | |||
Function | Label | Position | |
On board video enabled | SW1/1 | Off | |
On board video disabled | SW1/1 | On | |
» | Factory configured - do not alter | SW1/2 | Off |
» | Factory configured - do not alter | SW1/3 | Off |
Password enabled | SW1/4 | Off | |
Password disabled | SW1/4 | On | |
Monitor type select color | SW1/5 | On | |
Monitor type select monochrome | SW1/5 | Off | |
» | Factory configured - do not alter | SW1/6 | Off |
» | Factory configured - do not alter | SW1/7 | Off |
Setup access enabled | SW1/8 | Off | |
Setup access disabled | SW1/8 | On | |
DRAM CONFIGURATION | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
1MB | (1) 256K x 36 | None | None | None |
2MB | (1) 256K x 36 | (1) 256K x 36 | None | None |
3MB | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
4MB | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 |
4MB | (1) 1M x 36 | None | None | None |
5MB | (1) 1M x 36 | (1) 256K x 36 | None | None |
6MB | (1) 1M x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
7MB | (1) 1M x 36 | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 |
8MB | (1) 1M x 36 | (1) 1M x 36 | None | None |
9MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x 36 | None |
10MB | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x 36 | (1) 256K x 36 |
12MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
13MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x 36 |
16MB | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
16MB | (1) 4M x 36 | None | None | None |
17MB | (1) 4M x 36 | (1) 256K x 36 | None | None |
18MB | (1) 4M x 36 | (1) 256K x 36 | (1) 256K x 36 | None |
19MB | (1) 4M x 36 | (1) 256K x 36 | (1) 256K x 36 | (1) 256K x 36 |
21MB | (1) 4M x 36 | (1) 1M x 36 | (1) 256K x 36 | None |
22MB | (1) 4M x 36 | (1) 1M x 36 | (1) 256K x 36 | (1) 256K x 36 |
24MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x 36 | None |
25MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 256K x 36 |
DRAM CONFIGURATION (CON’T) | ||||
Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
28MB | (1) 4M x 36 | (1) 1M x 36 | (1) 1M x 36 | (1) 1M x 36 |
32MB | (1) 4M x 36 | (1) 4M x 36 | None | None |
33MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x 36 | None |
34MB | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x 36 | (1) 256K x 36 |
36MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x 36 | None |
37MB | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x 36 | (1) 256K x 36 |
48MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | None |
49MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | (1) 256K x 36 |
52MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | (1) 1M x 36 |
64MB | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 | (1) 4M x 36 |
CACHE CONFIGURATION | ||
Size | Bank 0 | TAG |
64KB | (8) 8K x 8 | (1) 8K x 8 |
256KB | (8) 32K x 8 | (1) 32K x 8 |
CACHE JUMPER CONFIGURATION | ||
Size | E7 | E8 |
64KB | Open | Open |
256KB | Closed | Closed |
VIDEO MEMORY CONFIGURATION |
Note: Board accepts 512KB/2MB of video memory. The size of the chips are unidentified. The number of banks is unidentified. |
CPU TYPE SELECTION | |||||
Type | E9 | E10 | E11 | E12 | E13 |
80486SX | Open | 2 & 3 | 1 & 2 | Open | 2 & 3 |
ODP486SX | 1 & 2 | 1 & 2 | 2 & 3 | Closed | 2 & 3 |
80487SX | 1 & 2 | 1 & 2 | 2 & 3 | Closed | 2 & 3 |
80486DX | 2 & 3 | 1 & 2 | 1 & 2 | Closed | 2 & 3 |
80486DX2 | 2 & 3 | 1 & 2 | 1 & 2 | Closed | 2 & 3 |
ODP486DX2 | 1 & 2 | 1 & 2 | 2 & 3 | Closed | 1 & 2 |
Note: Pins designated should be in the closed position. | |||||