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blog:386_shootout_umc [2021/02/09 15:48] – [Initial Thoughts] john | blog:386_shootout_umc [2021/02/12 10:53] – [UMC UM82C481] john | ||
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A 386DX/486 motherboard acquired from an auction, with information, | A 386DX/486 motherboard acquired from an auction, with information, | ||
+ | |||
+ | **[Update 12/ | ||
===== Initial Thoughts ===== | ===== Initial Thoughts ===== | ||
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{{: | {{: | ||
+ | Items to note: | ||
+ | * The battery has leaked, but appears to be // | ||
+ | * **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 // | ||
+ | * Soldered-on AMD 80386DX-40 processor | ||
+ | * Empty FPU socket | ||
===== Motherboard Data & Variants ===== | ===== Motherboard Data & Variants ===== | ||
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^ Item | ^ Item | ||
- | | Form Factor | + | | Form Factor |
- | | Chipset | + | | Chipset |
| 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 |
- | | CPU Speeds | + | | CPU Speeds |
- | | Expansion | + | | Expansion |
+ | |||
+ | 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 // | ||
- | Motherboard jumper settings can be found in the following locations: | + | > The following |
+ | > between C0000-DFFFF and two 64k blocks between E0000-FFFFF. | ||
+ | > | ||
+ | > - UM82C481 - From the UM82C480 50Mhz 80486 Chip Set | ||
- | * | + | |
+ | * {{ : | ||
+ | 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 // | ||
===== Configuration ===== | ===== Configuration ===== | ||