Panasonic TurboR A1-ST boots but doesn't work

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By o0nosferatuo0

Expert (72)

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07-01-2016, 12:31

Hi, if anyone could help i would appreciate it .

I have a TurboR A1-ST in non working condition. It was converted to 220v and all power +5 +12 -12 are all present in the motherboard. It boots fine ( MSX2 with 256k memory ), passes to the next screen ( Blue paper and light blue border ) and doesn't do anything else after. *** This machine was bought as Non-Working ***

Any help would be appreciated.

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By Meits

Scribe (6458)

Meits's picture

07-01-2016, 12:53

the colors you mention are default for that machine. You could try typing blind color 15,0,0 and see if you get a complete black screen with with letters.

By Jipe

Paragon (1511)

Jipe's picture

07-01-2016, 13:49

have you the original drive inside ? if not insert a floppy and reboot

By o0nosferatuo0

Expert (72)

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07-01-2016, 14:01

Hi, i've done what you said : color 15,0,0 and nothing

By o0nosferatuo0

Expert (72)

o0nosferatuo0's picture

07-01-2016, 14:03

No i don't have the original drive. Does it need the original drive to work?

By Jipe

Paragon (1511)

Jipe's picture

07-01-2016, 14:29

no but required Disk Change and Ready on the drive
for testing if exist unplug the disk flat cable and reboot

By l_oliveira

Hero (532)

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07-01-2016, 14:31

There's a two position switch on the panel near the space bar turbo speed slider (rensha turbo) set it to right to cause the internal software to display.

If it doesn't work (hangs on the boot up screen like before) on either positions for the switch, there's a problem with the circuit board (probably one of the address lines are cut between the S1990 and the R800 chip or between the S1990 and the ROM chips, making it unable to address the whole ROM memory or the memory mapper RAM.

The Turbo-R computer copies the ROM to the memory mapper on boot to be able to exploit the speed boost from ram which is faster than the ROM. But it boots from RAM.

So I suppose the stuff you want to check the most is the connections between the custom chips.

Sounds like it's very repairable. Cool

And no, it doesn't need the drive to boot to the command prompt in the MSX BASIC.

By o0nosferatuo0

Expert (72)

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07-01-2016, 19:00

I've already tested with that button and does the same.

By Jipe

Paragon (1511)

Jipe's picture

07-01-2016, 20:11

have you try a game cartridge on a slot ?

By o0nosferatuo0

Expert (72)

o0nosferatuo0's picture

07-01-2016, 20:20

i've tried with MegaFlash SCC+ SD in both slots, nothing works

By SuchAGoonie

Expert (108)

SuchAGoonie's picture

07-01-2016, 21:15

Do you get any sound? You could try by inserting a game cartridge and just pressing space a few times to see if you hear anything when/if the game starts.

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