skeleton/itc4.cpp: Add ASCII diagrams for PCB and control panel (#12374)

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Skeleton driver for temperature controller by Oxford Instruments Ltd.
PCB
_______________________________________________________________
| |
| ___ ___ |
| ___ |__| | | |
| HP2200 ________ |__| |
| |_______| |
| ___ |
| |LF3478N ________ ________ |
| |__| |DIPSx10| |DIPSx10| |
| :::::::::::: |
|_||||||||||||_________________________________________________|
||||||||||||
_||||||||||||__________________________________________________
| :::::::::::: ___ ___ |
| 74HC273P->| | | | |
| ___ <-B98-3-R100K | | | | |
| | | ____________ ____________ |__| |__| |
| | | |Z84C3006PEC| | DS1220Y | |
| |__| |Z80_CTC____| |___________| |
| ___ |
| | | _________ ____________ ___________ |
| | | |_74HC02P| | EPROM | | NM232C | |
|74HC244P->_| |___________| |__________| |
| ___ |
|74HC273P-> | _________ ________________ ____________ |
| .. | | |_74HC32P| |Z84C0006PEC | |D8251AFC | |
| .. |__| |Z80_CPU________| |___________| |
| .. |
| .. ___ _________ |
|74HC137P-> | |_74HC32P| SWITCH |
| | | ___ |
| |__| Xtal _________ | |<-L8939H |
| 8.000 MHz MC14526BCP |__| |
| _________ _________ ___ |
| |_74HC74P| |_74HC74P| LF353N |
| |
| ::::::::::::: ······ ::|
|______________________________________________________________|
FRONT CONTROL PANEL (o=LED, SW=switch)
_____________________________________________________________________________________________________________________
| __________________________________ ____________ _____________________ _____________ ___________ _________ ________ |
|| DISPLAY || SWEEP || HEATER || GAS FLOW || CONTROL || ADJUST || ||
|| ______________________ || || ____________ || || || || ||
|| o 1 | __ __ __ __ | || o HOLD || o 1 | | || || o LOCK || RAISE || ||
|| o 2 |+ | |__||__||__||__| | || o SWEEP || o 2 | |||||||||| | || || o REMOTE || SW || ||
|| o 3 |- | |__||__||__||__| | || o PROGRAM || o 3 | o o | || || o LOCAL || || ||
|| |_____________________| || || |____________| || || || || ||
|| CAL || RUN / || || o o || || || o ||
|| SENSOR o PROP INT DERIV SET || PROGRAM || SENSOR AUTO MAN || AUTO MAN || LOC/REM || LOWER || POWER ||
|| SW LIMIT SW SW SW SW || SW || SW SW SW || SW SW || SW || SW || SW ||
|| o || || || || || || ||
||_________________________________||___________||_____________________||____________||__________||________||_______||
|____________________________________________________________________________________________________________________|
BACK PANEL
-RS-232
-AUXILIARY (DB15)
-SENSOR 1 (DB9)
************************************************************************************************************/
#include "emu.h"