Go To in Woodstocks

[PANAMATIK]

(05-17-2016 10:36 AM)teenix Wrote:  Hi Bernhard

Thanks for the response.

I'm still not sure if I get it tho...

This is part of key press code that confuses me, I think after pressing '7' key.

01547 load constant 10
01550 c + 1 -> c[x]
01551 if n/c go to 01531 // this seems ok - in same ROM page
01531 p + 1 -> p
01532 if 0 = s 4
01533 then go to 0412 // this seems odd - jumps to ROM 1 from ROM 3
....
00412 c + 1 -> c[x]

There are 2 [go to] instructions without any bank switching but jump to different ROMs in the same 8K bank. I have observed this behaviour when I ran an emulator on the web, but I thought a general [go to] was limited to the 8 bits in the instruction, assuming no delayed select or bank switch previous.

the if n/c instruction can jump within the same 8-bit page. This goto is limited to 8-bit

All "if" instructions, like "if 0 = s 4", are followed by "then", which is a 10-bit jump address. This goto is not limited to 8-bit, but limited to 10-bit, because the instruction word is 10-bit wide.

Your work is very impressive!

Bernhard