3 ms·
It's way easier to tell when looking at the 8008. The 4004 has all kinds of strange instructions, like DAA (for BCD) and separate instructions for accessing ma
by andars 9y ago
It's way easier to tell when looking at the 8008.
The 4004 has all kinds of strange instructions, like DAA (for BCD) and separate instructions for accessing main memory, ROM, and RAM. It's pretty clear that it was made to be in a calculator.
On the other hand, the 8008 has the familiar IN, OUT, MOV, PUSH, etc.
- msla 9y agoThe BCD stuff made it into 8086, too: http://x86.renejeschke.de/html/file_module_x86_id_69.html http://x86.renejeschke.de/html/file_module_x86_id_69.html
- DonHopkins 9y agoToo bad my favorite 1802 instruction never caught on: 9N GHI Get high reg N R(N).1->D The "Break and Make Smoke" instruction was the predecessor of the "Halt and Catch Fire" instruction. http://www.elf-emulation.com/1802.html http://www.elf-emulation.com/1802.html