UPDATE: Just found schematics to a Tube Mini! 1958! WOW!

This unit is not listed anywhere on the web and have not found it in the list of Digital Computers (though I can't find the page I usually look at). In going through my PDP-8 stuff I found a book called "RCL". This *mini* was built in 1958. I uses delay line memory, has a number of mini-computer functions (many

flip flops) and it's programmed with wires (i think). It has a bulb front panel with some program control switches. Interfaced to it was a printer and a CRT (maybe more, I am just getting through the memory control schematics). Its memory control system contains: Set address, decimal decoder, subtract 1, read , add, write (all these three have many other function control flip flops), address overflow, decode, print, carry, add+1, end storage... Address system is 8 bit. (256 bits of address space) OOOOOOOOOOOOOO.. (just flipped the page) it *does* have a core memory

(5 stages X 256 bit) OOOOOOOOOOOOoo (just flipped the page again)... It has a 16 bit A/D converter (tubes) (sorry but OOOOOOOOOO - just flipped the,,,,,....) it has a data register

Ahhh, this is a 16 bit mini, with core (just found more core memory) Getting an instruction set here - (so far): Add +1 Add Add -1 (subtract) Compliment Add with carry reset (jump?) stop next page - A/D unit (yikes!) many tubes..... CRT display (uses delay line memory ... I think.. if not , no idea yet) Power supply is nasty printer control modules - yuck! Okay, indicator panel (found it) has: 16 bit data bus, 8 bit address bus (light bulbs) Programming - weird, user has access to core memory, has "START, RESET switches), it has a *really weird* tube for "real time".. looks to be a cesium tube or delay tube... many sensors for "real time" more programming instructions: print clear to zero display I thought at first this unit was a counter but I see a whole programming area with different op codes, two types of storage and a printer with CRT. This should qualify as a *kind* of mini... It was meant to work with A/D

D/A with some coded instructions in core memory/wires. Anyone hear of such a unit? Part of it is called "multichannel analyzer" but that is only the a/d subsystem. I only have the schematics so I have to figure stuff out from there. john