news@mfci.UUCP (Usenet) (11/17/89)
We have several IBM PC Model 5150 B's around here and I want to persuade one of them that it has a mono monitor. How do I set the dip switches on the motherboard for this? (Please send info on all switch settings if you have them.) Many thanks. (Pre-emptive flame: I'd RTFM but some F person stole TFM.) brendan fagan fagan@mfci.UUCP or fagan@multiflow.com
unkydave@shumv1.uucp (David Bank) (11/17/89)
In article <1124@m3.mfci.UUCP> fagan@mfci.UUCP (Brendan Fagan) writes: > >We have several IBM PC Model 5150 B's around here >and I want to persuade one of them that it has a mono monitor. > >How do I set the dip switches on the motherboard for this? >(Please send info on all switch settings if you have them.) > >Many thanks. > >(Pre-emptive flame: I'd RTFM but some F person stole TFM.) > >brendan fagan fagan@mfci.UUCP or fagan@multiflow.com All to happy to help. I'll be drawing this information directly from the IBM "Hardware Maintenance and Service" manual for the 5150. I'll be supplementing it with some other info I have, since my copy of the manual insists that switch #2 on SW1 is unused, when it actuality it is used to indicate the presence of an 8087. Anyway, in answer to your question, switches 5 & 6 of SW1 should be set to "OFF" to convince the PC it has a mono monitor. No other changes are needed. Now, about switch settings in general: SW1 (also called Switch Pack 1) is used mainly to indicate options on the system, such as drives and coprocessors and monitors. SW2 (also called Switch Pack 2) is used pretty much exclusively to indicate system memory. The switches and their meanings for SW1 are: 1 - Indicates if any floppy drives are installed. If this switch is "ON", switches 7 & 8 are ignored. If it is "OFF", 7 & 8 will be decoded to determine the number of floppy drives 2 - Used to indicate the presence or absence of a math coprocessor (8087). When this switch is on, the equipment check call will indicate there is no 8087. If the switch is "OFF", then the presence of a math coprocessor is indicated. 3,4 - Shows the amount of system/mother/planar board memory. Settings are: Amount (in KB) Switch 3 Switch 4 ----------------------------------------- 16 Kb ON ON 32 KB OFF ON 48 KB ON OFF 64 KB OFF OFF 96 - 256 KB OFF OFF 5,6 - Indicates Initial Video Mode for the connected displays. Settings are: Display Type Switch 5 Switch 6 ------------------------------------------ Monochrome OFF OFF (single display) Monochrome + another OFF OFF display Color (40 X 25) OFF ON Color (80 X 25) ON OFF 7,8 - Show the number of floppy drives attached, assuming Switch 1 is set properly. Indications are: # of floppy drives Switch 7 Switch 8 -------------------------------------------- 0 ON ON 1 ON ON 2 OFF ON I;m really not sanguine about going into the memory permutations and all the switch settings for SW2. I note that regardless of memory installed, Switchs 6, 7 & 8 of SW2 are ALWAYS in the "ON" position. The other 5 switches start as all "ON" for total memory less than or equal to 64 KB and go from there, changing as memory is added. E-Mail me of you want info on a particular configuration. Hope this helps. Unky Dave unkydave@shumv1.ncsu.edu