14 Aug
2014
14 Aug
'14
1:58 p.m.
On Thu, Aug 14, 2014 at 2:16 PM, Chris Osborn <fozztexx at fozztexx.com> wrote:
Well bummer. The new COM8116 chips arrived and that
didn't fix the problem. They don't get quite as hot though! But once the RS232
board has warmed up a bit, it keep transmitting the last byte sent. Doesn't repeat any
incoming bytes. Hope it's not the TR1602 chip that's bad, looking at eBay they are
very expensive.
There are a huge number of pin-compatible UART chips from various
vendors. Just a few are:
AMI S1757, S1883
Fujitsu MB8868A
GI AY-5-1013, AY-5-1013A, AY-3-1014, AY-3-1015
Harris, Intersil HD-6402, RCA CDP6402 (CMOS)
Signetics 2536
SMC COM2017, COM2502, COM2505
TI TMS6011
Western Digital TR1402, TR1602
The main differences between the various UARTs are the maximum speed,
whether they support a 1.5 stop bit setting, and whether they need a
negative power supply. The TRS-80 RS-232-C interface should work with
any of them.