IIe timing HAL 342-0170 (HAL/PAL 16R8) pinout
DIP-20. Divides the 14M master clock into PHI0, PHI1, Q3, the RAM strobes and the video load and dot-clock signals UNVERIFIED
A mask-programmed 16R8 (Apple 342-0170) clocked by 14M on pin 1. Its registered outputs make PHI0, PHI1 and Q3, the RAM strobes /PRAS and /PCAS, and the video signals /LDPS and VID7M. A dead HAL stops every clock after the oscillator, so the IIe is completely dead. Sams: clock at UE1 but none at the CPU means UC1, this HAL, UE1 or UB8. Pin names are as drawn on the Apple schematic; some input nets are not legible there.
Open the interactive HAL pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | CP | clock | Register clock: 14M, the 14.318 MHz master clock. |
| 2 | I0 | ctrl | Input 0. Its net is not legible on the schematic. UNVERIFIED |
| 3 | I1 | ctrl | Input 1, from the Q output (pin 10) of the S109 flip-flop at UC1. |
| 4 | I5 | video | Input 5: H0, horizontal timing from the IOU. |
| 5 | I3 | video | Input 3: VID7, video data bit 7. |
| 6 | I4 | video | Input 4: SEGB, video segment timing. |
| 7 | I2 | ctrl | Input 2. Its net is not legible on the schematic. UNVERIFIED |
| 8 | I6 | ctrl | Input 6. Its net is not legible on the schematic. UNVERIFIED |
| 9 | I7 | video | Input 7: /80VID, 80-column video mode. |
| 10 | GND | ground | Ground (the usual 16R8 pin; not drawn on the schematic). UNVERIFIED |
| 11 | /OE | ctrl | Output enable for the registered outputs. |
| 12 | /LDPS | video | Output 7: load pulse for the video shift register. |
| 13 | VID7M | video | Output 6: video dot-clock enable. |
| 14 | PHI1 | clock | Output 5: PHI1 system clock (Sams probes it here). |
| 15 | PHI0 | clock | Output 4: PHI0 system clock. |
| 16 | Q3 | clock | Output 3: Q3 timing strobe (Sams probes it here). |
| 17 | /PCAS | ctrl | Output 2: RAM column strobe, read by elimination from the outputs drawn at the sheet edge. UNVERIFIED |
| 18 | O1 | nc | Output 1; no net is drawn on it. UNVERIFIED |
| 19 | /PRAS | ctrl | Output 0: RAM row strobe (Sams probes it here). |
| 20 | VCC | power | +5 V (the usual 16R8 pin; not drawn on the schematic). UNVERIFIED |
Fitted in
- Apple IIe UD1 (Apple schematic 050-0051-D sheet 3; the Sams IIe folder uses the same designator)