Description: NOTE: This listing is for the bare circuit board only, see our other items if you'd rather have a fully assembled and tested GW-SDK80-RAM1! The Glitch Works GW-SDK80-RAM1 is a small mezzanine board which allows Intel MCS-80 System Design Kits (SDK-80s) to be expanded to 64K of RAM. It also provides ROM remapping and disable capability, with two external jumper wires. The GW-SDK80-RAM1 is a drop-in board, it replaces several ICs on the SDK-80. If your SDK-80 is socketed, this requires no actual modification to the SDK-80 itself, and can be reversed by unplugging the GW-SDK80-RAM1 and reinstalling the original chips it replaces. The GW-SDK80-RAM1 is compatible with JEDEC 62256-type static RAMs, as well as FM18W08 ferroelectric RAM (FeRAM). 28C256 EEPROMs are also compatible, though they are of limited use in this board. Kits and assembled boards are provided with machine pin headers for mounting in machine pin sockets; if your SDK-80 uses dual-wipe sockets, we highly recommend upgrading to quality machine pin sockets. In its default configuration with no control wires jumpered in, the GW-SDK80-RAM1 appears as 60K of static RAM from 0x1000 - 0xFFFF. Normal SDK-80 ROM is decoded through the mezzanine board, so existing ROMs in the SDK-80 ROM sockets will appear at their normal addresses (0x0000 - 0x0FFF). When TP1 is grounded, ROM is relocated to 0xF000 - 0xFFFF. When TP2 is grounded, ROM is disabled entirely and the entire SDK-80 memory space is filled with static RAM on the GW-SDK80-RAM1. TP1 and TP2 may be connected to any available 8255 PPI output pins for software control. ICs replaced by the GW-SDK80-RAM1 include: A11 and A12, Intel 8212 address buffersA13 8205/3205 ROM address decoderA18 8205/3205 RAM address decoderAll 2111/8111 static RAMsUnfortunately, due to eBay's external links policy, we can no longer include links to documentation and schematics for our products. The Intel SDK-80 pictured in this listing is NOT included and is used to demonstrate installation only. The first image shows the bare board option (this listing), while the last two show the fully assembled and tested option.
Price: 10 USD
Location: Buena Vista, Virginia
End Time: 2024-09-11T19:40:03.000Z
Shipping Cost: 5 USD
Product Images
Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Country/Region of Manufacture: United States
Compatible Brand: Intel SDK-80
Type: RAM Board
MPN: GW-SDK80-RAM1
Brand: Glitch Works
