Updates: Apple II Monitor Port and GR-64 Video

A couple of updates to recent blog posts: I did a little more work on the Apple II Monitor port to the Apple 1, getting the source code to assemble the version that includes the Woz Monitor at the end. This version can be burned to a ROM (or EPROM or EEPROM) in the Replica 1, so you can have both the original Woz Monitor and Apple II Monitor in ROM from powerup. I confirmed that it does work when programmed into a ROM. It also works in the POM1 Apple 1 Emulator. As before, the Apple II Monitor port can be found here.

SB-310 Receiver Gets A Speaker

I was able to get a matching SB-600 speaker on eBay for my SB-310 shortwave receiver. It has some paint chips but is not too bad looking overall. Probably thousands of these speakers were sold by Heathkit for the matching SB and HW series radios from 1966 through 1975, retailing for US$17.95 They tend to go for quite a high price on eBay. I got mine for a good price - probably because the seller listed it as an "SP-600" rather than an "SB-600" so many potential buyers may have missed it in searches.

SB-310 and SB-600 Speaker

The restoration of this radio only consisted of putting on a new line cord, cleaning it, and touching up the alignment. I made some rubber feet using rubber stoppers cut to size and drilled for a screw. I initially thought it was missing the 100 KHz crystal but it was installed in the LSB crystal socket (which is normally empty) by mistake.

Another View of the SB-310 Receiver

It is a good performer, picking up lots of shortwave stations in the evenings. The dial is linear and very accurate.

Repaired Function Switch With Microswitch

I was also able to fix the main issue with my SB-310, the broken power switch. It is a combined rotary wafer switch and power switch on the FUNCTION switch. Getting a new switch is almost impossible. I was able to rig up a micro switch in such a way as to be controlled by the rotor of the function switch. Provided that the Gorrilla glue holding the switch stays in place, it should do the job.