dnelson@umbio.MIAMI.EDU (Dru Nelson) (09/25/88)
The other day I opened up one of my appliance modules from Radio
Shack. Inside of it was this 8741 chip that appeared to be the main
thing that was controlling the module. I believe it is one of the
microcontroller chips by intel but I'm not sure. Can anybody confirm
this or share any off hand knowledge they have about this chip?
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Dru Nelson UUCP: (gould || uunet)!umbio!dnelson
Miami, Florida MCI: dnelson
Internet: dnelson%umbio@umigw.miami.edugene@cooper.cooper.EDU (Gene (the Spook) ) (10/01/88)
in article <636@umbio.MIAMI.EDU>, dnelson@umbio.MIAMI.EDU (Dru Nelson) says: > > The other day I opened up one of my appliance modules from Radio > Shack. Inside of it was this 8741 chip that appeared to be the main > thing that was controlling the module. I believe it is one of the > microcontroller chips by intel but I'm not sure. Can anybody confirm > this or share any off hand knowledge they have about this chip? Sure. The 8741 is a member of the 8048 family. The '7' in the part number indicates an EPROM instead of mask ROM. If I remember correctly, the 8741 is a shrunk-down version of the 8748 (8048 + 2k EPROM) which was particularly suited for non-CPU-intensive processing. A good reference, other than the Intel data sheets, is Adam Osbourne's \fI 4 and 8 Bit Microprocessors \fR or something. It's an inch thick book that sells for about $20 (in a brown cover with what looks like timing diagrams all over). This will give you a pretty good summary of most common 4 and 8 bit (hence the name) microprocessors. I got it from McGraw Hill Bookstores, but I'm sure that a helpful-type person will get you and the book connected somehow. Have fun! Spookfully yours, Gene ...!cmcl2!cooper!gene
jdg@ncrmud.Columbia.NCR.COM (Jim Griggers) (10/07/88)
In article <1386@cooper.cooper.EDU> gene@cooper.cooper.EDU (Gene (the Spook)) writes: -In article <636@umbio.MIAMI.EDU>, dnelson@umbio.MIAMI.EDU (Dru Nelson) says: -= -= The other day I opened up one of my appliance modules from Radio -= Shack. Inside of it was this 8741 chip that appeared to be the main -= thing that was controlling the module. I believe it is one of the -= microcontroller chips by intel but I'm not sure. - -Sure. The 8741 is a member of the 8048 family. The '7' in the part -number indicates an EPROM instead of mask ROM. - - Spookfully yours, - Gene - ...!cmcl2!cooper!gene Sounds like "8741" is a date code. I know of no X-10 modules that use the Intel 8741 for anything. The chips that are used in most modules are custom GI parts. The only microprocessor used in their controllers (that I know about) is an NEC 80C48. -Jim Griggers jdg@ncrmud.Columbia.NCR.COM
harriss@Alliant.COM (Martin Harriss) (10/08/88)
In article <105@ncrmud.Columbia.NCR.COM> jdg@ncrmud.UUCP (Jim Griggers) writes: >Sounds like "8741" is a date code. I know of no X-10 modules that use >the Intel 8741 for anything. The chips that are used in most modules >are custom GI parts. The only microprocessor used in their controllers >(that I know about) is an NEC 80C48. Of course the 80C48 is just a CMOS (i.e. low-power) version of the 8048, of which the 8741 is a variant. A sure way to tell if you have a real 8741 or not is to see if there is a window on the chip for uv erasure of the eprom. If there's a window, you do indeed have an 8741. Martin Harriss alliant!harriss
rlf@mtgzy.att.com (r.l.fletcher) (10/08/88)
In article <105@ncrmud.Columbia.NCR.COM>, jdg@ncrmud.Columbia.NCR.COM (Jim Griggers) writes: > > Sounds like "8741" is a date code. I know of no X-10 modules that use > the Intel 8741 for anything. The chips that are used in most modules > are custom GI parts. The only microprocessor used in their controllers > (that I know about) is an NEC 80C48. I'm pretty sure the Heath BSR/RS232 interface uses an 8741 also, I'll check mine out. Ron Fletcher AT&T Bell Laboratories Middletown NJ
dnelson@umbio.MIAMI.EDU (Dru Nelson) (10/10/88)
I checked it again. It has at the top PICO. On the next line 570.
On the next line 8731c-a. This chip was in a Radio Shack 3-prong
universal appliance switch.
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Dru Nelson UUCP: ....!uunet!gould!umbio!dnelson
Miami, Florida MCI: dnelson
Internet: dnelson%umbio@umigw.miami.edumarkz@ssc.UUCP (Mark Zenier) (10/11/88)
In article <741@umbio.MIAMI.EDU>, dnelson@umbio.MIAMI.EDU (Dru Nelson) writes: > I checked it again. It has at the top PICO. On the next line 570. > On the next line 8731c-a. This chip was in a Radio Shack 3-prong > universal appliance switch. The 8741 will be a 40 pin ceramic package with an erasure window. (There may be 44 pin chip carrier or what ever they are called). If it is the only chip, it is unlikely to be the 8741, since it has a bus interface and is designed to be a programmable peripheral directly connected to a computer bus. Mark Zenier uunet!pilchuck!ssc!markz "He did decide, though, that with more time and a great deal of mental effort, he could probably turn the activity into an acceptable perversion"-Mick Farren
rlf@mtgzy.att.com (r.l.fletcher) (10/11/88)
In article <1490@ssc.UUCP>, markz@ssc.UUCP (Mark Zenier) writes: > In article <741@umbio.MIAMI.EDU>, dnelson@umbio.MIAMI.EDU (Dru Nelson) writes: > > I checked it again. It has at the top PICO. On the next line 570. > > On the next line 8731c-a. This chip was in a Radio Shack 3-prong > > universal appliance switch. > > The 8741 will be a 40 pin ceramic package with an erasure window. (There may > be 44 pin chip carrier or what ever they are called). If it is the only chip, > it is unlikely to be the 8741, since it has a bus interface and is designed > to be a programmable peripheral directly connected to a computer bus. If it's an appliance module it is not an 8741, no module I've ever seen has (or needs) a 40 pin DIP. Aside, I have a lamp module that died. Some modules (light switch) have a fusible link which blows. This one doesnt seem to. Is there any protection device in these which I can repair? If not, does anyone know if BSR will still swap these things for a nominal charge? Does anybody have an address to get these repaired? It is an older Sears type (300 watt/brown), not the RS "cost-reduced" kind. Ron Fletcher AT&T Bell Laboratories Middletown NJ att!mtuxo!mtgzy!rlf