hi
gouda slot expander have many litle problem with philips (i have 8280)
try to loaded the bus of the slot expander with one or two cartridge (slot
select not actived) and change the scsi in all sub-slot
try to clean the connector of the cartridge of slot expander
one of my sub-slot don't accept gouda scsi and mega-sram (corrupt datas)
but work with other cartrige
a long ribbon cable pertub the bus
i have sunrise slot expander with my turbo-r and i have not this problem
just if power of slot expander (pc xt powersupply) is not actived in the
same time of the turbo-r i have blank screen
i have just added a power switch and don't cut the swicth of powersupply of
the turbo-r and of the pc xt powersupply
220v =)---------------o__o-----I---(= =)-------------- turbo-r
I---(=
=)-------------- pc xt powersupply slot expander
Jipe
----- Original Message -----
From: "Gerald Stap" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, October 11, 2003 11:40 PM
Subject: [MSX] Novaxis Problems on Philips NMS8255 help wanted hw debugging
> Hi,
>
> After 5 years I finally decided to bring my MSX back to life. But with
> all the external hardware (the slotexpander, scartcables + selector for
> GFX9000, rs232c + external modem, novaxis scsi + harddrive and
> zipdrive) it barely fits on my desk. So I decided to build my NMS8255
> into a miditower to save space.
>
> NB. Before I built the whole lot into my miditower, everything worked
> fine except for the fact that the gfx9000 and de opl4 couldn't both be
> entered in de gouda slotexpander due to power problems. The setup worked
> with the gfx9000 in slot 1 and the opl4 in the slotexpander thouigh.
>
> After I built the whole lot in an miditower a little problem arose which
> has been haunting me for two weeks now.
>
> The problem is that everything works except for the Novaxis. It can only
> find the scsi harddisk but won't boot from it. Instead it exits to
> BASIC. Drive A: is not readable from DOS 2.xx. And physical drive A is
> mapped to drive B. Also the novaxis cannot detect the zipdrive. I can
> not enter the setup menu. It says wait or something, and then the
> computer hangs.
>
> It does not matter if I use cartridge slot 1 or 2 directly or the slots
> in the slot expander. Other cartridges like Kingsvalley 2 or my FM-Pak
> work fine.In fact the whole MSX performs fine unil I attach the Novaxis.
>
> The msx-mainboard is now connected to a 150Watt PC-AT powersupply which
> should be sufficient. I checked all the voltages +/-12V and +5V on the
> AT powersupply and they seem to bee correct. This is also the case with
> slot 1+2 and the Gouda slotexpander even with cartridges in them.
> Zip-drive, diskdrive A&B and the SCSI hd now get their power directly
> from the AT powersupply.
>
> My first thoughts were that maybe the Novaxis SCSI interface had a
> defect or I had a bad SCSI chain, but when I put a dos 2.20 cart and the
> Novaxis in the slotecpander, and connect the slotexpander to my NMS8235
> with doublesided diskdrive, using the SCSI chain in the miditower (zip +
> hd) the Novaxis detects both my HD and zipdrive and boots from it. Then
> everything seems to work ok. I can even enter the setup menu. So this
> rules out a faulty SCSI chain or bad termination.
>
> I even replaced the MSX main board in the miditower with another. But
> still I have the same problem.
>
> Specs board 1:
> Philips MSX2 NMS8255 board with built in dos2.20, fast diskrom 7 mhz and
> 512kB RAM
>
> Specs board 2:
> Philips MSX2 NMS8255 board with built in dos2.20, fast diskrom 7 mhz and
> 256kB RAM
>
> I'm very puzzled.
> Does anybody have any ideas on how to get the novaxis working? what are
> the tolerances of the novaxis?
>
> - Could it be a grounding problem?
> - Is it advisable to supply the slotexpander it's own +/-12V and 5V from
> the AT power supply instead of getting it from the MSX main board via
> slot 1 or 2?
>
> Any help/hints would be greatly apprciated.
>
> Gerald
>
>
>
>
>
>
>
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>
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