blog:386_shootout_umc

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
blog:386_shootout_umc [2021/02/09 15:49] – [Original Auction Images] johnblog:386_shootout_umc [2021/02/18 12:43] (current) – [Conclusion] john
Line 4: Line 4:
  
 A 386DX/486 motherboard acquired from an auction, with information, repairs, testing and benchmarks. A 386DX/486 motherboard acquired from an auction, with information, repairs, testing and benchmarks.
 +
 +**[Update 12/02/2021]** - The seller lost the motherboard, so this particular transaction wasn't completed.
 ===== Initial Thoughts ===== ===== Initial Thoughts =====
  
Line 18: Line 20:
  
    * The battery has leaked, but appears to be //relatively// contained    * The battery has leaked, but appears to be //relatively// contained
 +   * **Battery leak:** on AT keyboard socket; needs to be desoldered and replaced
 +   * **Battery leak:** on BIOS rom socket; needs to be desoldered and replaced, and EPROM cleaned (and backed up, preferably)
 +   * **Battery leak:** around keyboard controller ; needs to be desoldered and cleaned
 +   * **Battery leak:** possible evidence on first ISA slot
 +   * Fitted with 4x //Winbond// W2457AK-20 SRAM chips 32kbx8 and 1x //Motorola// 8kbx8-15 tag SRAM, should be a total of 128KB of cache
 +   * Soldered-on AMD 80386DX-40 processor
 +   * Empty FPU socket
 ===== Motherboard Data & Variants ===== ===== Motherboard Data & Variants =====
  
Line 23: Line 32:
  
 ^ Item            ^ Item           
-| Form Factor    |  |  +| Form Factor    | Baby AT  |  
-| Chipset        |  +| Chipset        | UMV UM82C481 / UMC82C482 
 | Dimensions      | Dimensions     
-| Maximum RAM    |  |  +| Maximum RAM    | 8x 30pin SIMM; unknown capacity, but presumably 8x4MB to make 32MB |  
-| Cache          |  |  +| Cache          | Yes; unknown capacity |  
-| FPU            |  |  +| FPU            | Yes, PGA socket; 387 |  
-| CPU Type        |  +| CPU Type       386 DX, PGA socket |  
-| CPU Speeds      |  +| CPU Speeds     25,33,40MHz |  
-| Expansion      |  +| Expansion      | 6x16bit, 1x8bit 
  
  
-Motherboard jumper settings can be found in the following locations: 
  
-   +The UMC82C481 memory controller as fitted to this board supports the provision of UMB memory via **The Last Byte** memory manager. As noted in the file //chipset.doc//: 
 + 
 +> The following  chip  provides 256k of memory in eight 16k blocks 
 +> between C0000-DFFFF and two 64k blocks between E0000-FFFFF.   
 +
 +> - UM82C481 - From the UM82C480 50Mhz 80486 Chip Set 
 + 
 +  * {{ :blog:tlb_v220.zip |}} 
 +  * {{ :blog:tlb_v252.zip |}}
  
 +These UMB regions can then be used to load drivers and TSR's high, using the //highdvr// and //hightsr// utility included with The Last Byte memory manager similar to the MS-DOS commands //devicehigh// and //loadhigh//.
 ===== Configuration ===== ===== Configuration =====
  
Line 110: Line 127:
  
  
-(Go back to the [[blog:286_pc|286 PC main page]])+(Go back to the [[blog:386_pc|386 PC main page]])
  • blog/386_shootout_umc.1612885772.txt.gz
  • Last modified: 2021/02/09 15:49
  • by john