uhclem@trsvax.UUCP (05/22/89)
<> B>Written 10:05 am May 18, 1989 by ccicpg.UUCP!paulm in comp.sys.tandy B> I got the new 1989 Tandy catalog and it had a Model 4D in it. B> I bought a model 4 recently and would like to upgrade it to B> model 4D. My question is this: B> Is the only difference the DOUBLE sided drives ? The 4D has a different main logic board than the Model 4. Most noticable differences are that the RS232 connector exits the back instead of the bottom, AND the 4D has no wait states, the 4 has one. (4D runs at the same computation speed as a 4P.) B> If I put 2 48 tpi (PC XT types) Double sidded drives into B> my model 4 will the disk controller know how to handle it ? Yes, although you may have to replace the 34 pin cable to the floppy drives. Check the cable and make sure pin 32 is in all three connectors. If it is there, no problem. If it has been removed, then the cable must be replaced with the one that has pin 32. (You can order the cable used in the 4D if you are unable to get the parts needed to make your own.) B> Does TRS-DOS 6.2 or LSI-DOS 6.2/3 know ? Yes. Also all the LDOS 5 series, so you can run 99% of your Model III software in double sided-mode. Only TRSDOS 1.3/1.4 (there is NO 1.5, *I* should know) are unable to deal with double-sided drives and treat them as single-sided. B> other comments... TRSDOS 6.2 is obsolete, but you should get one so you have the manuals. Then order LS-DOS 6.3 from MISOSYS (you can get it from RS but you might as well get it from the manufacturer). 6.3 assumes you have the 6.2 manuals. This will bring the system up to date. <This information is provided by an individual and is not nor should be construed as being provided by Radio Shack or Tandy Corp. Radio Shack/Tandy Corp has no obligation to support the information provided in any way. So they don't.> "Thank you, Uh Clem." Frank Durda IV @ <trsvax!uhclem> ...decvax!microsoft!trsvax!uhclem ...sys1!hal6000!trsvax!uhclem
gmadison@pnet02.cts.com (George Madison) (05/24/89)
uhclem@trsvax.UUCP writes: > > >B> Does TRS-DOS 6.2 or LSI-DOS 6.2/3 know ? > Yes. Also all the LDOS 5 series, so you can run 99% of your Model III > software in double sided-mode. Only TRSDOS 1.3/1.4 (there is NO 1.5, > *I* should know) are unable to deal with double-sided drives and treat > them as single-sided. > Sorry.... SYSTEM 1.5 is a third-party enhancement package for M3 TRSDOS 1.3. So technically speaking, you're right, practically speaking you're wrong. |George Madison, a/k/a George The Bear Cub, a/k/a Furr ** BEAR POWER **| |INET: gmadison@pnet02.cts.com 8-{)> ames!elroy!pnet02.cts.com!gmadison| |GEnie: GEORGE.M Arctophiles & Barbophiles Unite! PLink: BEARDLOVER| "I knew you were up to something, though I confess I hadn't thought of necrophilia." -- Prince Barin to Princess Aura, _Flash Gordon_
danielw@wyn386.UUCP (Daniel Wynalda) (05/25/89)
In article <193300134@trsvax>, uhclem@trsvax.UUCP writes: > > B> Is the only difference the DOUBLE sided drives ? > The 4D has a different main logic board than the Model 4. Most > noticable differences are that the RS232 connector exits the back > instead of the bottom, AND the 4D has no wait states, the 4 has one. > (4D runs at the same computation speed as a 4P.) It is possible to modify your model 4 to run at full 4Mhz 0 wait state like the 4D does with a simple pin removal from a socket. I am not sure which one it is anymore but I am sure I could find it if requested. I just had to pull an IC from a socket, bend out a pin in the corner, and plug it back in. The machine became noticably faster. -- Daniel Wynalda | Telephone: (616) 866-1561 X22 Ham callsign: N8KUD Wynalda Litho Inc. | Network: danielw@wyn386.UUCP ..sharkey!wyn386!danielw 8221 Graphic Ind Pk. | No one should hold this company responsible for what Rockford, MI 49341 | I say. After all, my ham call is pronounced "Naked".