View Profile: Exceter - Vintage Computer Forum

Today, 04:56 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

It is an odd thing; I will give you that. The funny thing is that I almost remember running into this with my original Tandy 1000 back in the 80's.

75 replies | 935 view(s)

Today, 04:10 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

The whole point of write protection is to keep a disk from being changed/overwritten in the first place, people make mistakes. Thankfully the bug...

75 replies | 935 view(s)

Today, 09:07 AM

alank2 replied to a thread Format with write protect on... in PCs and Clones

I hereby name it the "Tandy 1000 non-DMA write protected format BIOS bug."!

75 replies | 935 view(s)

Yesterday, 05:44 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

Thank you for doing the testing to confirm it! Good job sir!! The question now perhaps is - for the other Tandy 1000's that do not have a DMA...

75 replies | 935 view(s)

Yesterday, 05:28 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

>I now have the same formatting behavior without DMA. Interesting behavior! (I was finally able to boot in 128k using DOS 3.1) Good job Chris!!!!...

75 replies | 935 view(s)

Yesterday, 03:35 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

Can you pull it and test it without DMA? There are a whole different set of functions in the bios for non-dma disk access. (I do understand if...

75 replies | 935 view(s)

Yesterday, 02:36 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

chris_nh - does your Tandy 1000 have a DMA controller installed? I switched to a new floppy cable that was longer. My first mistake was not...

75 replies | 935 view(s)

Yesterday, 01:02 PM

alank2 replied to a thread Toshiba T3100e Memory Upgrade in Vintage Computer Hardware

Thanks Humppa for the excellent write up on this!!! My T3100e now has 5MB RAM as well!!! I used these:...

32 replies | 20239 view(s)

Yesterday, 03:56 AM

alank2 replied to a thread Format with write protect on... in PCs and Clones

I've tried both the Tandy MS-DOS 3.30 format and also the stock MS-DOS 6.22 format - both do the same thing.

75 replies | 935 view(s)

April 8th, 2021, 08:17 PM

modem7 replied to a thread WTB: Tandon TM-100-2A servo board in Vintage Computer Items Wanted

Given shipping cost and time from Australia, probably good to exhaust local suppliers first. Out of curiosity, are you missing the board, or are...

5 replies | 107 view(s)

April 8th, 2021, 07:00 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

UNLESS, pcem supports DMA mode. Maybe the non-DMA does this, but the DMA doesn't since they are different functions in the BIOS.

75 replies | 935 view(s)

April 8th, 2021, 05:31 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

It is quite a puzzle. I downloaded pcem and used the same ROM from my Tandy 1000A that I dumped earlier in it. It fails immediately on a write...

75 replies | 935 view(s)

April 8th, 2021, 04:15 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

Perhaps someone else with a Tandy 1000 or 1000A could try to format a write protected disk at some point.

75 replies | 935 view(s)

April 8th, 2021, 03:18 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

Do you mean running the MS-DOS 6.22 format program on another PC? It fails immediately.

75 replies | 935 view(s)

April 8th, 2021, 02:44 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

I'm not following the code very well, I don't know x86 and/or its peripherals enough. int 13 - ah 05 is supposed to return an error code in AH,...

75 replies | 935 view(s)

April 8th, 2021, 02:04 PM

modem7 replied to a thread Format with write protect on... in PCs and Clones

This] may help.

75 replies | 935 view(s)

April 8th, 2021, 01:50 PM

alank2 replied to a thread Format with write protect on... in PCs and Clones

That looks pretty good Eudimorphodon! They have the int 13_05 function even picked out. Now if I can just understand it and how the 765 works!

75 replies | 935 view(s)

April 8th, 2021, 01:42 PM

modem7 replied to a thread WTB: Tandon TM-100-2A servo board in Vintage Computer Items Wanted

Whereabouts on the world are you ?

5 replies | 107 view(s)

April 8th, 2021, 11:19 AM

alank2 replied to a thread Format with write protect on... in PCs and Clones

I can dump it, isn't there a tool around here to do that?

75 replies | 935 view(s)

April 8th, 2021, 10:48 AM

alank2 replied to a thread Format with write protect on... in PCs and Clones

Does IMD require DMA? My T1000 does not have DMA.

75 replies | 935 view(s)

April 8th, 2021, 09:28 AM

alank2 replied to a thread Format with write protect on... in PCs and Clones

Same result with the NEC chip. If write protect is confirmed to be working, is there any other signal that could cause this? Could it be a BIOS...

75 replies | 935 view(s)

April 8th, 2021, 09:14 AM

alank2 replied to a thread Format with write protect on... in PCs and Clones

Okay; I'll try the NEC and see if it acts differently. I somewhat remembered the WD not being the same.

75 replies | 935 view(s)

April 8th, 2021, 08:14 AM

alank2 replied to a thread Format with write protect on... in PCs and Clones

Bad 7417 replaced with a socket and a new 7407. This fixed the motor drive, so the 360K drive works again. I connected up the GoTek as well, and...

75 replies | 935 view(s)

April 7th, 2021, 06:43 PM

alank2 started a thread I modified LTEMM so that it has an option to not make that tick noise in Vintage Computer Hardware

It was a bigger problem when my Tandy 1000's volume was turned all the way up, but for anyone who wants a quiet non ticking LTEMM, I added a new...

2 replies | 56 view(s)

April 7th, 2021, 05:07 PM

alank2 replied to a thread Please recommend a disk cache that uses EMS/expanded memory in PCs and Clones

XTIDE with a disk on module flash.

9 replies | 167 view(s)

April 7th, 2021, 04:00 PM

alank2 replied to a thread Please recommend a disk cache that uses EMS/expanded memory in PCs and Clones

It does - I tried it and it does cache. It is a situation of diminishing returns because the overhead of pc-cache at 4.77 MHz is not faster than not...

9 replies | 167 view(s)

April 7th, 2021, 03:59 PM

alank2 replied to a thread The /p doesn't work in mem /c/p on my Tandy 1000 (MS-DOS 6.22) in Tandy/Radio Shack

80 column mode. |more does work as expected.

4 replies | 64 view(s)

April 7th, 2021, 03:58 PM

alank2 replied to a thread Does the Tandy 1000A have a volume control? in Tandy/Radio Shack

I adjusted it and indeed it is a volume control. Looks completely different than the one in the video, but that is a SX.

2 replies | 46 view(s)

April 7th, 2021, 03:00 PM

alank2 replied to a thread The /p doesn't work in mem /c/p on my Tandy 1000 (MS-DOS 6.22) in Tandy/Radio Shack

I haven't tried resorting to |more yet because the hold button is so easy to press, but I just wonder why it would act differently.

4 replies | 64 view(s)

April 7th, 2021, 02:59 PM

alank2 started a thread Does the Tandy 1000A have a volume control? in Tandy/Radio Shack

I noticed a pot at R1 right near where the speaker plugs into the motherboard. Could this be a volume? The volume is currently way too loud.

2 replies | 46 view(s)

Exceter
Senior Member

Mini Statistics

More 5 Friends

MicroCoreLabs

alank2

lyonadmiral

modem7

Trixter

Recent Visitors

Basic Information

About Exceter

Signature

Statistics

Total Posts

General Information

5 Friends

alank2

lyonadmiral

MicroCoreLabs

modem7

Trixter

Exceter Senior Member

Mini Statistics

More 5 Friends

Recent Visitors

Basic Information

About Exceter

Signature

Statistics

Total Posts

General Information

5 Friends

Exceter
Senior Member