| Re: SBC VER 2 First Build with K13 next to ECB Connector [message #2478 is a reply to message #2476] |
Wed, 19 April 2017 23:37  |
jcoffman
Messages: 332
Registered: October 2015
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Senior Member |
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UNA 2.1 is the latest release. Good there. "s" is the "small" 512K ROM image.
Most disturbing: LED D1 not lit. U17 (244), U7 (14), & U5 (125) must all be installed. Plus, with U17 missing, the board may be inoperable. U17 drives /WAIT and /BUSRQ, which are direct Z80 inputs. I don't know what happens if they are left floating. They need to be tied HIGH. U17 insures this.
Okay to omit U8,U9,U11. Probably okay to omit U10. With no external peripherals, & no ECB bus, K13 may be left open for the time being.
RE: jumpers pin 1 is ALWAYS the square pin. To be sure, turn the board over and check from the bottom. I think your assumptions above are incorrect. I see a lot of pin1's toward the Z80.
Note I don't use the DS1210, so it is necessary to short pins 1-8 and 5-6 in the socket.
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