System360 Hardwired vs. Microcoded 389

Hi Wally I do have documentation on the 2841 microword.

Here it is: CA: 4+Alt bits to select the first ALU input register (for each cycle) CB: 2 bits to select the second ALU input (not all regs useable on B) CD: 4+Alt bits to select the ALU output target CV: 1 bit for true-complement input to ALU CC: 3 bits to select the ALU operation CN: 6 bits for the next microword address bits 7-2 CL: 4 bits to select the value of or one of 14 test objects for setting bit1 of the next microword address CH: 4 bits to select the value of or one of 14 test objects for setting bit0 of the next microword address CK: 8 bits for the constant field, which could be gated to input B. This was a dual use field, and was also used to select bits 12-8 of the next microword, when necessary. CS: 4 bits which decoded to setting or resetting one of 8 status bits

Very good score !!!

The CM, CU, CF and CG fields (memory control) where used on the30 but not in the 2314.

Henk Stegeman