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View Full Version : V30 in a Tandy 1000 RL



Great Hierophant
August 8th, 2012, 02:04 PM
The Tandy 1000RL and RL-HD have an 8086 running at 9.54MHz (4.77MHz in slow mode). The earlier Tandy 1000SL and SL/2 had 8086s running at 8MHz (4MHz, NOT 4.77MHz, in slow mode). The 8086s in the SL & SL/2 machines were standard 40-pin DIPs and were socketed. The RL and RL-HD have a 8086 in a 44-pin PLCC package soldered to the motherboard.

Upgrading the Tandy 1000 SL & SL/2 to a V30 is as easy as finding an 8MHz or better V30 (NEC μPD70116) in a 40-pin DIP package. Once upgraded, it should be faster in many respects than the RL. Upgrading an RL is daunting. First you have to find a V30 in the appropriate PLCC (a.k.a. QFJ) package, and I'm sure they were less common than the 40-pin package. Second, you have to desolder the existing 8086 from the RL's board. If you truly don't care about the original CPU, you can snip the pins off, which should make it easier to remove the legs with a desoldering wick. Third, you have to solder the chip, or even better a PLCC socket onto the board. It looks like there is enough clearance around the CPU for a socket, and by using a socket you drastically increase your margin or error and decrease the risk of heat damage to the chips or board.

So has anyone been brave enough to upgrade their machine?

Rick Ethridge
August 9th, 2012, 08:55 PM
I upgraded my 1000 SL with a V30 chip. I heard that, to get the best performance, a program was needed to be run. Anyone know about this and where it can be found?

vwestlife
August 10th, 2012, 06:04 AM
I have both a 1000SL and a 1000RL-HD.

SL's advantages:
* More slots
* More drive bays
* Can add a V30
* Can add an 8087
* Bigger/louder built-in speaker

RL's advantages:
* Much smaller size
* No fan (SL's fan is VERY loud)
* Faster clock speed
* 768K RAM (SL only goes up to 640K, some of which is always taken by the video RAM)
* Built-in IDE-XT hard drive interface
* PS/2 keyboard & mouse ports

Great Hierophant
August 12th, 2012, 08:35 AM
I have both a 1000SL and a 1000RL-HD.

SL's advantages:
* More slots
* More drive bays
* Can add a V30
* Can add an 8087
* Bigger/louder built-in speaker

RL's advantages:
* Much smaller size
* No fan (SL's fan is VERY loud)
* Faster clock speed
* 768K RAM (SL only goes up to 640K, some of which is always taken by the video RAM)
* Built-in IDE-XT hard drive interface
* PS/2 keyboard & mouse ports

If you put the V30, the SL would probably be be the faster of the two machines.

Great Hierophant
August 25th, 2012, 09:28 PM
Here is another difficulty, even if you are not afraid of soldering or risking destroying a not-common PLCC 8086 or RL motherboard : finding a PLCC NEC V30 (uDP70116) is extremely difficult! It does exist, but the V20 and the V35-50 are more common.

patscc
August 25th, 2012, 10:35 PM
That last one might be solvable using a PLCC breadboarding jig, like these things.
http://www.logicalsys.com/plcc-emulator-adapter.asp

Of course, you'd have to find one that actually fits in the case.
patscc
p.s. If anyone has a 1000RL they're willing to let go cheaply, PM me.