CommodoreZ
Experienced Member
Greetings! I wasn't sure where to post this, so here's my best guess
For some time now, I've been putting off the next stage in bringing my Heathkit H89 back up to working status. The folks over at the SEBHC were most instrumental at helping me revive it over a month or so. After several blown capacitors, a few torches traces, and a reset line being stuck, it finally whirred back to life. Now all I need is the OS disks, but before I mess with that, I want to try using the terminal properly.
However, I've reached an impasse that might require a more generalized retro computer approach: the terminal portion (identical to an H19/Z-19) has low TX voltage. I'm only getting about 2 volts from it, which isn't enough for any of my RS232 equipped gear to pick up. I replaced the line driver for the TX section, and checked all the voltages going to the driver, but no change occurred. Any ideas what the next course of action might be?
If for some reason this cannot be solved properly, I was wondering if it would be wise to use a device to step up the voltage to 5 volts after it leaves the H89. To me, this seems rather kludgy, but I have no problem doing something like that if I must. The idea of actually using a physical terminal is whimsical, and I wish to pursue it.
Thanks!
For some time now, I've been putting off the next stage in bringing my Heathkit H89 back up to working status. The folks over at the SEBHC were most instrumental at helping me revive it over a month or so. After several blown capacitors, a few torches traces, and a reset line being stuck, it finally whirred back to life. Now all I need is the OS disks, but before I mess with that, I want to try using the terminal properly.
However, I've reached an impasse that might require a more generalized retro computer approach: the terminal portion (identical to an H19/Z-19) has low TX voltage. I'm only getting about 2 volts from it, which isn't enough for any of my RS232 equipped gear to pick up. I replaced the line driver for the TX section, and checked all the voltages going to the driver, but no change occurred. Any ideas what the next course of action might be?
If for some reason this cannot be solved properly, I was wondering if it would be wise to use a device to step up the voltage to 5 volts after it leaves the H89. To me, this seems rather kludgy, but I have no problem doing something like that if I must. The idea of actually using a physical terminal is whimsical, and I wish to pursue it.
Thanks!