Forth51 hardware design

First posted
Thursday January 27, 2011 14:22
Friday March 4, 2011 10:32


Friday March 4, 2011 10:32

ExpressSCH power-on initialization
- Friday March 4, 2011 10:31

CY7C6813A Forth51 schematics download page.

ExpressSCH keyboard control, finish chip selects
- Thursday March 3, 2011 09:03

If you have downloaded ExpressSCH, then you can above schematic to experiment with.

More decode, Boot camp C training
- Wednesday March 2, 2011 18:34

Decode ExpressSCH
- Monday February 28, 2011 19:29

CY FX2LP memory design.

8250 pinout.

Shadow RAM.
Shadow RAM is the process of copying the contents of a ROM directly into extended memory which is given the same address as the ROM, from where it will run much faster. The original ROM is then disabled, and the new location write protected. You may need to disable shadow RAM whilst installing Multi-user DOS.

Pull-up resistor.
For CMOS and MOS logic, much higher values of resistor can be used, several thousand to a million ohms, since the required leakage current at a logic input is small.

Power-On-Reset :-)

Embedded Controller Forth for the 8051 Family decode.

CY FX2LP memory design.

Chip selects started.

Cypress FX2LP decode corrected, 74LS125 tr-state buffer, ExpressSCH introduction, size of Forth86 and Forth51 - Tuesday February 22, 2011 14:00

Austin memory diagram.


74HC datasheets.

Cypress FX2LP decode explained in Austin - Tuesday February 15, 2011 17:58

Decoding for Cypress EZ-USB, Austin Kinetis seminar, and other stuff - Friday February 11, 2011 15:43

PCI bus, soft chip selection, router LEDs, 'It's not bad writing. That's the way they think.' Natural gas, solar keyboard - Thursday February 10, 2011 09:49

Router failure, Cypress EZ-USB memory decoding, _-PSEN, -RD, -WR and program counter vs data pointer memory accesses, Jerry Krasner report - Wednesday February 9, 2011 14:56

Lenovo G560 video camera Cypress C36Y71 - Tuesday February 8, 2011 08:43

Forth51 hardware design.

Thursday January 27, 2011 14:22


  1. Logic gate

Monday February 7, 2011 09:11


needs to be understood well to ensure that Forth51 will work.

Below diagrams must be understood too.


Intel 9-Bit Embedded Controllers 1991

Sunday February 6, 2011 07:01


Sunday February 6, 2011 15:27

Cypress has implemented von Neumann/Princeton architecture  inside its USB chips!

Here's instructor's schematic segment for implementation of von Neumann
architecture for a TI MSC 1210 8051 variant.

Above from


Instructor was planning an installation of Forth51 on the above chip in 2001.

Below chips bought for higher clock frequency implementation of Foprth51 mahcines.

Here's a link to 245 specifications.

8k x 8 STATIC RAM.

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