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COSMAC Elf

Some Links and ideas for my COSMAC Elf projects.

COSMAC ELF The CDP1802’s Place in Microcomputing History http://www.cosmacelf.com/
Lee Hart's 1802 Membership Card http://www.sunrise-ev.com/membershipcard.htm
Herb Johnson's retrotechnology http://www.retrotechnology.com/memship/memship.html
http://www.cosmacelf.com/forumfaq.html, https://groups.yahoo.com/neo/groups/cosmacelf/info
Spare Time Gizoms COSMAC Elf 2000 http://www.sparetimegizmos.com/Hardware/Elf2K.htm
Geoff Graham's ASCII Video Terminal http://geoffg.net/terminal.html

Emulator

Uhr

32768 kHz 2^15, Seiko

https://assets.nexperia.com/documents/data-sheet/74HC_HCT4040.pdf

Cosmicos

http://retro.hansotten.nl/1802-cosmicos/

FPGA

http://whats.all.this.brouhaha.com/category/computing/retrocomputing/retrochallenge/

On the XC7A100T-1FGG484, which is the slowest speed grade, it meets timing at 62.5 MHz. Since my 1802 core only needs one clock per machine cycle, versus 8 for the original CDP1802, it runs at the equivalent of a 500 MHz CDP1802.

https://wiki.forth-ev.de/doku.php/projects:fig-forth-1802-fpga:start

Forth

Interface

Raspberry Pi Interface

Pinout https://pinout.xyz
maximal 27 IOs; I2C, SPI und UART sollten nicht benutzt werden (etwa 10 pins).
Pegelwandler 5->3.3V für Input (8 Ports ?)

http://www.retrotechnology.com/memship/mship_pcport.html

Programmiersprache

Python
C
PHP
Tcl
bash gpio command

beginnt immer bei Adresse 0.

hex2cosmac [filename] [-v]
cosmac2hex [-s nnnn] [-e nnnn] [-v] [filename]
bin2cosmac

> hexdump -C
00000000  2d 2d 2d 2d 2d 42 45 47  49 4e 20 50 47 50 20 50  |-----BEGIN PGP P|
00000010  55 42 4c 49 43 20 4b 45  59 20 42 4c 4f 43 4b 2d  |UBLIC KEY BLOCK-|

0000 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F ................
0010                                                 Hallo Velo!

> /dev/null

https://en.wikipedia.org/wiki/Hex_dump

http://www.raspberry-pi-geek.de/Magazin/2013/05/Tricks-zum-Programmieren-der-GPIO-Schnittstelle