'goto" gone from computer languages or is it!

Tony Duell ard at p850ug1.demon.co.uk
Tue May 17 18:01:41 CDT 2005


> 
> On Mon, 16 May 2005 23:54:34 +0100 (BST)
> ard at p850ug1.demon.co.uk (Tony Duell) wrote:
> 
> > > Hey, WTF, over?! I thought you guys were all programmers?
> > 
> > Hey, I've never claimed to be a programmer. A hardware hacker, maybe,
> > but not a programmer...
> > 
> > -tony
> 
> Steve Ciarcia used to say his favorite 'programming language' was
> solder.

I remember that...

Actually, I have modified a program using a soldering iron. I have the 
M792 diode matrix boot ROM in my PDP11/45. Actually I have 2 of 
them, one contain the paper tape bootstrap, the other the mass storage 
device bootstrap. The latter will boot the RK05 (which i have), amongst 
other devices -- to use it, you load 773100 (start address of the boot 
ROM) into the address register, then put the CSR address for the selected 
device on the switches, then START. Anyway there were a few unused 
locations at the end of the ROM, so I soldered in the appropriate diodes 
to load the right register with the RK11 CSR address and jump to the 
right point in the ROM. The result is that I can leave the address of the 
first of those instructions on the swtiches, then just hit LD ADDR and 
START to boot the RK05.

-tony


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