Reply 8570 OEM Planar
Reply 486DX and BL2-66 Upgrade use the same system board.
Reply 8570 Upgrade OEM Planar (486DX version shown)
J10 Power header for IDE drive. From left to right (power connector edgecard towards CPU) +5 V, 12 V, GND
U20,71,72,96,107 Chips F82C22x - components of the Chips/280 Chipset.
U100 5 V 17x17 486 Socket. Pads for 19x19 ZIF (POD hack?). I have popped in a 486DX4-75 and it ran fine. The HMM calls this a "P23T Upgrade connectors".
U110 Solder pads for two different QFP parts. My guess, 486SLC or 486SX.
Two Planar Upgrades Available
486DX 33MHz, Option P/N 70G8988 This includes an integrated memory cache controller and Math Co-Processor support. The clock speed operates at 33MHz for the internal and external operations.
486BL2 66MHz, Option P/N 32G3300 The IBM 486 BL2-66 includes an internal memory cache controller and 16KB memory cache. The clock speed operates at 66MHz for the internal operations and 33MHz for external operations.
Alan Hightower won an auction for a 20MHz Model 70, and imagine his utter chagrin when he found a BL2-66 Upgrade board inside. I would have sent it back, "not as described", but he was too passive aggressive, and he didn't complain...
Anyways, thanks to Alan, we can be certain there is ONE 8570 upgrade board. It either has a LIF in U100 and a bare U110 [486DX board] or a BL2-66 soldered in U110 and a LIF socket in U100 [BL2-66 board].
Supports 4MB or 16MB 70ns and 80ns Industry standard SIMMs. Up to 32MB memory support (31MB addressable)
006 error occurs after adding memory to 8570 with either system board upgrade installed:
The 8570 upgrade only supports 4MB and 16MB Industry Standard Memory SIMMs. Memory transferred from previous system board will not function on upgrade boards.
IBM's 4MB Industry Standard SIMM, Feature Code 7634, Option P/N 92G7201 and a 16MB Industry Standard SIMM, Feature Code 2011, Option P/N 92G7204 or P/N 60G1622. Memory must be identical in size and speed if using both memory SIMM sockets.
Rich Wolos grabbed a 16MB parity from his Lacuna 77 and it worked fine.
Just to Show this Means Business
Billy Wong wrote:
Memory Expansion Adapters Supported
The following memory adapters are supported:
The PS/2 80386 Memory Expansion Option (6450367) is not supported.
SVGA video up to 1024 x 768 pixels (1MB video memory standard)
Al Brandt says:
33 MHz Clock Source
Alfred Arnold identifies source of 33MHz:
32-bit HD Mode under W95
From Greg Frantz:
Standard IDE/ESDI Hard Disk Controller (Change to manual settings)
This will enable the HDD in 32-bit mode and has also allowed the use of a 4x Toshiba CD-ROM. To get the floppy to work, install the Standard Floppy Disk Controller after getting the HDD working. The other thing to note is that the floppy had to be a Sony for me to get it working.
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