Reply 8570 OEM Planar

70_FLASH.EXE  8570 planar upgrade flash BIOS v1.18.02
rf70plan.exe  8570 planar upgrade reference diskette

486DX and BL2-66 use same system board.

Reply 8570 OEM Planar
32-bit Mode under W95

Reply 8570 Upgrade OEM Planar [486DX version shown]

F1 KB fuse 5MF 3A 250v
J1 Mouse
J2 Keyboard
J3 Parallel
J4 DB25 Serial
J5 HDD-15 Video
J7 3 pin jumper
J8 Power edge connector
J9 IDE interface
J10 3 pin header (power for IDE drive)
J11 Header for Spkr/Battery
J13 Password clear?
P1 16-bit AVE slot
P2-P3 32-bit slot
P4 16-bit riser slot
U4 1.8432 MHz osc
U5 PC16550CV / NS16550AFV
U6 Linear LT1141CS
U8 02M3285 N8742AH
U9 Cirrus Logic CL-GD5426
U20 Chips F82C226
U25-27, 29 MT4C16257DJ-7
U31 Sony CXK5864BM-10L
U35, 36 72 pin SIMM sockets
U41 02M3286 (PLCC flash)
U49 CSI CAT28F010N-15 
U69 N82077SL
U71 Chips F82C322A
U72 Chips F82C321A
U96 Chips F82C325A
U100 486DX socket
U107 Chips F82C223
U110 Outline for BL2-66 CPU
U119 40.0000 MHz osc
Y1 143NDK37. xtal
Y2 32.768 KHz tuning fork xtal
Y3 S240 xtal 24MHz xtal for 82077SL?

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].

Two Planar Upgrades Available
486DX 33MHz, Option P/N70G8988 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/N32G3300   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.

U100 5v 17x17 486 socket. Outline (and 19x19 array!) of a ZIF. POD hack? I have popped in a 486DX4-75 and it ran fine. The HMM calls this a "P23T Upgrade connectors" 

U110 Outline for two different flat packs. My guess- 486SLC or 486SX.

J10 Power header for IDE drive (YES!!!). From left to right (power connector edgecard towards CPU) +5v, 12V, GND

U25, U27 Outlines for Video DRAM

CHIPS/280 chipset
C&T was a fabless company, searching for 82Cnnn got me hits. DATASHEET

82C223 DMA Controller
82C226 System Peripherals Controller
82C321 CPU and MCA controller
82C322 Page/Interleave and EMS controller
82C325 Data/Buffer controller

Cirrus Logic CL-GD542x Data Book
Cirrus Logic CL-GD542x Technical Reference

IMI SC425 System Clock PLL Frequency Synthesizer Datasheet
LT1141CS Triple Bus-Line Transceiver Datasheet
CXK5864BM-10L High Speed CMOS Static RAM, 8Kx8, 28 Pin  Datasheet
MT4C16257DJ-7 Dynamic RAM, Fast Page, 256K x 16, 40 Pin, Plastic, SOJ Datasheet 
N8742AH MicroController, 8-Bit, 44 Pin, Plastic, PLCC Datasheet 
NS16550AFV Universal Async Receiver / Transmitter with FIFOs Datasheet 
PC16550CV 1 Channel, 1.5M bps, Serial Comm Controller, 44 Pin PLCC Datasheet  

U35-U36 Supports 4MB or 16MB 70ns and 80ns Industry standard SIMMs. Up to 32MB memory support (31MB addressable)

006 Error
 006 error occurs after adding memory to 8570 with either system board upgrade installed:
                     - 486DX 33MHz, Option P/N70G8988
                     - 486BL2 66MHz, Option P/N32G3300

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/N92G7201 and a 16MB Industry Standard SIMM, Feature Code 2011, Option P/N92G7204 or P/N60G1622. 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:
   BTW I also tried to upgrade the board's 8 megs of RAM (two 4 meg modules are on it already) with the two IBM 8 meg 70ns true parity SIMMs and it gave me the 006 error.

Memory Expansion Adapters Supported
   The following  memory adapters are supported:
o   2-8MB 80386 Memory Expansion Option (#5211, 6450605)
o   Enhanced 80386 Memory Expansion Option 2MB Kit (#3077, 34F3077)
o   Enhanced 80386 Memory Expansion Option 4MB Kit (#3011, 34F3011)
       The PS/2 80386 Memory Expansion Option (6450367) is not supported

33 MHz Clock Source  

Alfred Arnold identifies source of 33MHz:
   You asked where the 33MHz clock is coming from.  I am quite sure they come out of U113.  This is a so-called 'clock synthesizer' chip that typically gets a 14.31818 MHz clock (Y1) as input and uses programmable frequency dividers and multipliers to generate arbitrary output clock frequencies (J13 might be a jumper to select between two frequencies, haven't checked that so far).  Such synthesizers first became popular with Super VGA boards since they needed a lot of different clocks for the different resolutions and you were able to replace half a dozen discrete oscillators with one crystal and such a synthesizer chip.  These days, they're a standard component on every PCI man board.

32 Bit Mode under W95
From Greg Frantz
 I finally got in front of one of the machines.  Here is what I manually added to get the system working.

Standard IDE/ESDI Hard Disk Controller (Change to manual settings)
Basic Config 0
I/O 01F0-01F7
I/O 03F6-03F6
IRQ 14

   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.

SVGA video up to 1024 x 768 pixels (1MB video memory standard)

W95 Experiences
Al Brandt sez:
    I loaded mine up with Windows 95 and with the Cirrus Logic video, you can get up to 800x600 at 16-bit color. I don't know if the W95 driver does that, but I know that it at least does 640x480 at 16-bit.

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