HERO 1

A 6808 robot with a six-digit LED panel, a hex keypad and an SC-01 voice board.

Open the HERO 1 in Retro Bench
Also
ET-18
CPU
6808 on a 3.579545 MHz crystal (ROM 1.0); 4 MHz with ET-18-6 or ROM 1.3/1.U
RAM
4 KB (two 6116, $0000-$0FFF)
ROM
8 KB monitor ROM at U418 ($E000-$FFFF); optional U417
Video
Six 8-segment LED digits, hex keypad
Sound
SC-01 speech on the speech accessory (P501)
OS
Monitor ROM (1.0, 1.1, 1.U, 1.3); HERO-1 BASIC on ET-18-9

Chips

ChipWhereRole
MC6808 microprocessorU401Main CPU. Runs the monitor, ROM and speech and motion code. No on-chip RAM.
74LS138 3-to-8 decoderU403, U406, U421, U4223-to-8 line address decoder.
6116 2K x 8 static RAMU415, U4162K x 8 static RAM.
2764-pinout 8K x 8 ROMU4188K x 8 ROM or EPROM in the JEDEC 2764 pinout.
MSM5832 real-time clockU315Clock and calendar for HERO 1 (U315 on the I/O board).
ADC0804 8-bit A/D converterU602 (sense board)Converts the sense voltage to a byte on HERO 1. Sense board U602.
SC-01 / SC-01A speech synthesizerU501Speech. Turns six-bit phoneme codes into sound. Used on the HERO 1 speech accessory and HERO Jr.

Ports and connectors

Power rails

RailExpectMeasure at
Logic battery (+12 V system)13.9 V float on charge; 10 V = LGLo warninghero1-charger pin 2 (charger socket); hero1-p201 pin 3
Motor battery (+12 V system)13.9 V float on charge; 10 V = drlo warninghero1-charger pin 6 (charger socket); hero1-p201 pin 10; hero1-p202 pin 20 (steering)
+5 V logic (main)+5 V (4.5 V or more: TM troubleshooting chart) UNVERIFIEDhero1-p201 pins 4, 5; CPU pin 8 (VCC)
+5 V standby (VSB)About 5 V, also during sleep UNVERIFIEDhero1-p404 pin 52 (U326 output) to the 6116 RAMs
+5 V display (switched)+5 V UNVERIFIEDhero1-p1201 pin 8 controls Q1202/Q1201
+12 V speech (switched)+12 V battery at P502 pin 13; switched +12 V at U502 pin 14 when speech is onhero1-p502 pin 13 (in); U502 (LM388) pin 14 (switched)
+6 VAbout 6 V UNVERIFIEDhero1-p316 pin 151
+8 V motionAbout 8 VMotion board regulator U1401 (TM printed p. 78)

Symptoms