Some files for Cosmac Elf self build simple computer based on 1976 article in Popular Electronics based on CDP1802 cpu.
Updates: 2020-07-26: a18.zip to include Mac OS X 10.12 binary and source changes.
Und mit weißer Platine:
Files:
cosmac.zip - Win 16-bit emulator for windows up to XP. For Win10 64-bit, one can use: https://github.com/otya128/winevdm
a18 - assembler incl. C source - DOS version requires cwsdpmi.exe
microelf - pcb files for Eagle and Elecrow incl. supporting files. By Mike Riley (see links).
EDIT: Have tried to convert brd to utilize 12 equal switches (no special IN switch; no mod needed). See file Microelf_pcb2.zip (Verified working on 2020-01-24).
palm_elf.zip - TinyELF emulator and ElfASM assembler incl. pdb editor in java.
simelf - Cosmac ELF emulator in javascript. Start emu.html.
Links:
http://www.elf-emulation.com/hardware.html
http://www.retrotechnology.com/memship/memship.html
http://www.donnelly-house.net/programming/cdp1802/simelf/
Kleinstes Programm: LOAD 7B IN 30 IN 00 IN 00 IN LOAD wieder weg; dann RUN. Sollte Q-LED leuchten..
smallest counter program:
@0000:EF 80 BF AF 9E 5F 1E 64 30 01 .
NOP code is C4 if filling first bytes is needed.
Würfel (Throw a dice):
@0000:
F8 00 B2
F8 FF A2 E2
F8 00 AA
37 0A
37 1A
1A 8A
FF 06
32 17
E2
30 0C
AA
30 0C
8A FC 01
52 64 22
30 07
LED Blinker:
@0000:
7A - REQ - Reset ‘Q’ = 0 (turns ‘Q’ LED off)
F8 - LDI - Load data (10) into ‘D’ register
10
B1 - PHI - Set high order byte of register R1 = ‘D’ (10)
21 - DEC - Decrement contents of register R1
91 - GHI - Set ‘D’ equal to contents of high order byte of R1
3A - BNZ - If ‘D’ ≠ 0, short branch to address 0004
04
31 - BQ - If ‘Q’ = 1, short branch to address 0000
00
7B - SEQ - Set ‘Q’ = 1 (turns ‘Q’ LED on)
30 - BR. - Unconditional short branch to address 0001
01