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JAQ's Blog - Electronics, Microcontrollers, DEC Minicomputers, Raspberry Pi, Airplanes and other stuff....
Total: 6 results found.
Replacing 2708 EPROM with 28C16 EEPROM
... CPU board. To debug the machine I needed it to run some known software. An easy replacement for a 2708 is a 28C16
with a home made adaptor. As shown in the diagram below they are ...
Northstar Horizon Repair
... net) but worked around the problem by building an adaptor for a 28C16
in 2708 Adaptor With the 28C16 installed I could see activity on the /CS pin (pin 11) of ...
TRS-80 Model 1 FreHD Expansion Interface
... (IC1,IC2,IC3,IC4) 1 x 62256 32K Static RAM (IC5) 1 x 28C16
(IC6 - Optional) 1 x 22V10 GAL (IC7) 1 x 18F13K22 (IC8) 8 x 0.1uf Ceramic Caps (C1,C2,C3,C4,C5,C6,C7,C8) ...
Making ROMs with SRECORD
The Kaypro / FreHD adaptor uses a 28C256
chip that contains multiple ROM images. The active image is controlled by jumpers on the high address lines. The challenge I had ...
Kaypro / FreHD Adaptor - Part 2
... pin header problem was solved using headers from eBay and offsetting the header that connects to the Kaypro PCB socket from the sockets on the shim where the Z80 and 28C256
are installed. ...
CAT Interface for eBay AD9850 DDS Modules
... FT-817 and came to the horrible realization that it reads many "undocumented"
locations to work out all sorts of things that the officially documented commands may not provide. This ...
PDP8 SBC6120 FP6120
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