First post, by chinny22

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Someone on Freecycle was giving away a bunch of "Amstrad computers" not far from where I live last month
Not really my thing but the wife likes watching "The Apprentice" so thought she would get a kick out of the Alan Sugar connection. I have a little play then pass it onto someone else.

I replied to the add, giving a very brief explanation that I like old PC's and this would go well with my 486. He responded that all the Amstrad's had gone but did also have a 486 if I was interested. You bet I said yes!

What I got was a Crown badged Tatung TCS 9510

Spec was
CPU: DX2/50
M/:B Tatung TCS 9510, No cache
RAM: 16MB EDO, Possibly upgraded from 8MB as the first pair of Simms' don't match the 2nd pair
Video: Onboard Cirrus Logic 5428 VLB
Sound: Mad 16 (82C928 chip)
FDD: Standard 3.25 drive
HDD: Seagate ST3290A, 260MB
CD-ROM: 4x NEC CDR-273

it also came with a nice DEC keyboard that goes upto F14 and a CRT that I didn't realize till I got home was actually a CGA monitor! namely a rebadged Daewoo CMC-1424S.

Talking to the guy at collection it was actually his neighbors who had passed away and he was helping clear the house.
Booted the PC up and found a nice clean install of Win95, IE4, Comptens 3D World access, Office 97 Pro, Thumbs+CD and a printer. That was it.
Looks like it was used between 99-2001 and briefly again in 2006 by a retired ship captain to type up letters to naval security boards (kind of interesting)
Couldn't see any evidence of the PC ever being on the internet which explains why it still ran pretty well. It's got an asset tag and a lot of the hardware is dated from 95 so he looks to be the 2nd owner.

PC was pretty clean on the outside and inside was ok for a PC for its age

Even still after confirming it worked first thing I did was give it a clean, the Gold lettering on Crown comes off pretty easy. and sorry to say I butcherd the face plate 🙁
When reassembling it wouldn't fit properly on the case, I thought I must of warped it so went crazy with superglue. Went to put the lid back on... damn it! forgot the faceplate mounts to that not the front of the case and had to end up snapping most the plastic clips to get it off. Lucky you wouldn't know my mistake by looking at it, but the right side of the faceplate is a bit loose.

Next I upgraded the cache with help from here to 256MB and maxed out the ram at 64MB with 2x 32MB sticks. I tried my luck 128MB but seems the documentation is correct and it indeed only recognizes 64.
That's fine, even with 64MB half of it gets assigned to a RAM drive anyway.

The DX2/50 was a good choice of CPU as it needs a voltage regulator board for anything much faster, I just happen to have a "anything" POD 83 to be exact so that got moved to this and PC that came out of has a 5x86 133 now so don't think it's upset.

Also fitted it a Gotek (obviously form pic above) a NIB VLB Network card I got from the Pentium Pro Haul of 2018 -yep that's 3 VLB devices in this rig 😀

I wanted a CF card as a secondary HDD so have had to unplug the CD drive for now (I find I dont really need CD drives necerry in dos PC's as long as you have large HDD's and networking anyway)
BIOS only supports 500MB drives so have a 4GB CF card with DDO. First time using DDO and impressed.

Now running Dos 6.22 Windows for Workgroups 3.11


Finally some benchmarks:
50Mhz No Cache
3DBench 28.9
PC Player Bench 6.9
doom 2134 gametics in 4476 realtics
Quake 4.3 fps

83 Mhz No Cache
3DBench 49.3
PC Player Bench 13.2
doom 2134 gametics in 2679 realtics
Quake fps 10.1

83 With Cache
3DBench 57.1
PC Player Bench 13.5
doom 2134 gametics in 2466 realtics
Quake fps 11.1

Freecycle been good to me lately though! I also ended up getting a 17" CRT that month, haven't really tested yet (It does turn on) then twist of fate one of those Amstrad's came back up few weeks ago and managed to grab this time.

Future plans:
Test if the onboard gameport works with my SC-55, that would be helpful because…
Replace the soundcard. The Mad16 is ok but can't seem to get sound in Doom and only doom. Music is ok and sound works in EVERY other game I have. Haven't fully troubleshooted this yet though.

Reply 1 of 9, by chinny22

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Had a good play with this over the weekend.

So far all 3 VLB devices are playing nice together, I dont know why but this makes me very happy when I know it's typical for even 2 to fight.

The Cirrus Logic 5428 looks to be a pretty good chip. it's always up the top in Phils VLB tests (although he's missing the holy grail cards) https://youtu.be/39pNCEKJK3Q
And ended up playing 1/2 the Warcraft missions when testing if I had the noise issue, which I don't 😀

If anyone has ideas on Doom sound I'd be grateful though?

Reply 2 of 9, by Hezus

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Nice pc! As for the Doom sounds, this could be conflict setup conflict. This has happened to me before where the 220 address was accessible for the music but the IRQ and/or DMA channel was taken by another device.

I often use Snooper to check the usage of the channels. It's strange though how other games work fine. See if those other games actually use digitized sounds and not just rely on adlib.

Visit my YT Channel!

Reply 5 of 9, by chinny22

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Aokiji wrote on 2022-02-27, 21:54:

Do you have a manual for it? Have the exact same machine but got no info on it, also got 64mb of ram and a dx2 66 installed in it , got a dx4 100 but no voltage regulator board

Bios update can be found here, but I never had any kind of manuals.
https://www.elhvb.com/supportbios.info/archiv … 9510/index.html

VLB DX2/66 is a 486 in my books, only reasion this has something faster is because I already own a DX2/66 VLB

Warlord wrote on 2022-03-02, 17:07:

nice little system.

Indeed it is now, however back in the day it would have been a nothing special "pizza box" 486 that people complained about the lack of room to upgrade, I know case I was one of them with a similar system
Now I love the things 😀

Reply 6 of 9, by evasive

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Hi, I am planning on further documenting your board, for that I'll need hi-res pictures of front and back (if the file size is <8MB it will fit 😀 ) and if possible a bios dump.

Reply 9 of 9, by davidrg

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That DEC keyboard is either off of a terminal (VT510/520/525) or an Alpha workstation possibly sold for OpenVMS use (Alphas sold for Windows NT would, I assume, have had a regular PC keyboard. Not sure what was shipped for Digital UNIX)