deano@admiral.UUCP (Dean Carpenter) (06/11/91)
Recently I posted about having problems with the 4860 motherboard frm
Hauppauge not being able to handle incoming async at 19200 under ISC unix
2.2.1. Although FAS reports that it initted two 16450s, the actual UART
is a PLCC chip from UMC labelled :
UM82C452L
9031S
529660
I've been told that this contains two 16450s, and possibly also handles
the parallel port. As this isn't just a simple yank-the-450s and
stick-in-the-16550As case, what can I do ? Does anyone know exactly what
this chip is, and more to the point, is there a replacement for it that
will contain the 16550A FIFOs ? Any help would be most appreciated :)
Thanks - Dean (reply to uunet!areyes!deano)
deano@admiral.UUCP (Dean Carpenter) <uunet!areyes!admiral!deano>
The Grid/Magpie and /Waffle BBS
(HST/V32) 203-661-1279 (PEP/V32) -2873 (V32) -0450 (V29/MNP6) -2967
Multiplayer Games, Multicolor Chat, Multibbses, Multifun!root@zswamp.uucp (Geoffrey Welsh) (06/18/91)
Dean Carpenter (deano@admiral.UUCP ) wrote: >Recently I posted about having problems with the 4860 >motherboard frm >Hauppauge not being able to handle incoming async at 19200 >under ISC unix >2.2.1. Although FAS reports that it initted two 16450s, the >actual UART >is a PLCC chip from UMC labelled : > UM82C452L > 9031S > 529660 >I've been told that this contains two 16450s, and possibly >also handles >the parallel port. As this isn't just a simple >yank-the-450s and >stick-in-the-16550As case, what can I do ? Does anyone know >exactly what >this chip is, and more to the point, is there a replacement >for it that >will contain the 16550A FIFOs ? Any help would be most >appreciated :) UMC (Universal Microelectronics) is a Korean (I believe) company which specializes in low-cost ICs, including custom ICs designed to hold the equivalent of an entire I/O card. Other companies do the same. Unfortunately, this pretty much prevents one from using a 16550. You might want to see if there's some way to disable the serial ports on the all-in-one chip or, if it's on a card, replace the card. -- Geoffrey Welsh - Operator, Izot's Swamp BBS (FidoNet 1:221/171) root@zswamp.uucp or ..uunet!watmath!xenitec!zswamp!root 602-66 Mooregate Crescent, Kitchener, ON, N2M 5E6 Canada (519)741-9553 "He who claims to know everything can't possibly know much" -me
root@gold.sub.org (Christian Seyb) (06/19/91)
In <V56c41w164w@admiral.UUCP> deano@admiral.UUCP (Dean Carpenter) writes: >Recently I posted about having problems with the 4860 motherboard frm >Hauppauge not being able to handle incoming async at 19200 under ISC unix >2.2.1. Although FAS reports that it initted two 16450s, the actual UART You have to disable the onboard uarts and plug in an extra card containing two 16550s. regards Christian -- Christian Seyb | Internet: cs@gold.de.intel.com uucp login: nuucp Fuchsweg 86 | Mailbox: +49-8106-34593 24h 300-19200 PEP/V.32 8011 Baldham | +49-8106-34692 24h 300-19200 HST -- Wer nach allen Seiten offen ist, kann nicht ganz dicht sein.