Differences
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| boards:sbc:z180_mark_iv:z180_mark_iv [2019/08/21 23:06] – Revision from 2019-08-21 | boards:sbc:z180_mark_iv:z180_mark_iv [2026/06/15 12:38] (current) – external edit 127.0.0.1 | ||
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| Line 1: | Line 1: | ||
| /* Imported from Wayback Machine | /* Imported from Wayback Machine | ||
| - | | + | |
| - | | + | |
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| */ | */ | ||
| Line 73: | Line 73: | ||
| ON BOARD PERIPHERALS ADDRESS | ON BOARD PERIPHERALS ADDRESS | ||
| - | P10 80H = OXXX | + | P10 80H = OXXX where O = open and X is closed |
| EPROM (27C080) | EPROM (27C080) | ||
| Line 81: | Line 81: | ||
| P12 1-2 | P12 1-2 | ||
| - | FLASH (29F040) | + | FLASH (29F040/39SF040) |
| P11 2-3 | P11 2-3 | ||
| Line 92: | Line 92: | ||
| P2 | P2 | ||
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| + | PRIMARY SERIAL PORT CONNECTION | ||
| + | |||
| + | P3 | ||
| + | |||
| + | With a MAX233 installed at U4 the serial port provides RS-232 level signals on Tx, Rx, CTS and RTS lines. Connection to the P3 header is via a standard Serial RS232 DB9 Male COM Port IDC connector. The Z8S180 enforces CTS/RTS flow control so this must be selected in your terminal program and supported by your serial cable and interface. | ||
| + | |||
| + | If a MAX233 is not being used and communication is TTL level, the following connections should be made on the U4: | ||
| + | |||
| + | 2-5 - Tx | ||
| + | |||
| + | 3-4 - Rx | ||
| + | |||
| + | 1-18 - RTS | ||
| + | |||
| + | 19-20 - CTS | ||
| + | |||
| + | Recommended RS-232-TTL to USB converters are the CP2102 based devices that have the additional RTS/CTS pin header locations. | ||
| + | |||
| + | In the absence of a device or cable that support CTS/RTS, pin 1 and pin 20 should be bridges on U4. | ||
| + | |||
| + | RS422 SERIAL PORT CONNECTION | ||
| + | |||
| + | P15 | ||
| + | |||
| + | The RS422 provides the advantage of higher speed, greater noise immunity and multi-drop connectivity over the primary serial connector and is ideal for connecting to remote controllers. Only Tx/Rx is supported i.e there are no flow control or modem signals. | ||
| ===== Firmware ===== | ===== Firmware ===== | ||
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| 18.432Mhz clock | 18.432Mhz clock | ||
| + | |||
| + | Serial connection at 9600 with CTS/RTS flow control. | ||
| Tests: | Tests: | ||
