= = = WHEATBOX 55A1 = = =
WheatBox 55A1 is a handheld 8-bit computer by Jack Eisenmann. The computer runs WheatSystem version 1.0.0.
Features of WheatBox 55A1:
- 16 by 2 alphanumeric display
- 12-button keypad with full ASCII support
- ATMega328 running at 8 MHz
- 32 KB of SRAM and 128 KB of EEPROM
- TTL serial port
WheatBox 55A1 without a case:
WheatBox 55A1 fastened inside a case:
List of parts in the computer:
- (x1) Microcontroller: ATMEGA328P-PU
- (x1) 32 KB SRAM: 23K256-I/P
- (x1) 128 KB EEPROM: 25LC1024-I/P
- (x1) 2 x 16 character display: EA DOGM162L-A
- (x1) 8 MHz crystal oscillator: ABL-8.000MHZ-B2
- (x2) 22 pF capacitor: SR215A220JARTR1
- (x4) 0.1 uF capacitor: K104K15X7RF5TL2
- (x2) 1 uF capacitor: RDEC71E105K0P1H03B
- (x1) 10 uF capacitor: RDEC71H106K3S1H03A
- (x1) 13 bussed 10 kOhm resistors: 4114R-2-103LF
- (x1) 28-pin IC socket: 1-2199298-9
- (x2) 8-pin IC socket: 1-2199298-2
- (x2) 2-pin female header: M20-7820246
- (x1) 20-pin female header: M20-7822046
- (x3) 3-pin male header: 69190-403
- (x12) Button: B3F-1000
- (x1) Switch: MHSS1104
- (x1) 2 AAA battery holder: 2468 (from Keystone Electronics)
Microcontroller GPIO pin mapping:
- SRAM CS = Pin 6 = PD4
- EEPROM CS = Pin 5 = PD3
- Display CS = Pin 26 = PC3
- Display reset = Pin 28 = PC5
- Display mode = Pin 27 = PC4
- Button row 1 = Pin 15 = PB1
- Button row 2 = Pin 13 = PD7
- Button row 3 = Pin 14 = PB0
- Button column 1 = Pin 23 = PC0
- Button column 2 = Pin 24 = PC1
- Button column 3 = Pin 4 = PD2
- Button column 4 = Pin 25 = PC2
More resources for WheatBox 55A1: