TI-99/4A MYARC HFDC Hard Floppy Disk Drive Expansion Card (Winchester)

[+helocast]

Between a rock and a hard place - not enough information to list in AA Market Place and certainly not enough to list on that other E-unnamed selling site.

As this isn't the appropriate forum, I'll keep entry short (photos attached).

Pricing? Looking to give this Myarc HFDC Hard + Floppy Disk Drive Expansion Card a good home.

I purchased it from Tim Tesch the summer of 2019 repaired, but never got around to putting in a PEB and testing it let alone using it.

Other than what's available on Ninerpedia, Mainbyte, WHT documentation-wise, I don't know more history about it but I know it's aging away in my '99 part drawers.

It didn't come with clamshell or cables, but I'll include a 20-pin + two dual 34-pin cables I purchased new shortly after I got the card.

Serious inquiries, I guess PM me as I can monitor AA for a couple days though I don't regularly get around these parts much any more.

Doug

Myarc HFDC V11.zip

[+acadiel]

I have one that I keep for rescuing Myarc floppies, but I need a spare.  Let me know what you're thinking for price.  I'll give it a good home.

 

[mvancopp]

I also have a lovely home for it ? and would be interested depending on what you are thinking for a price.

 

Thanks,

Mark

 

[+helocast]

Thanks all for the PMs/replies here - working down the list in DTG order of contact.

Finally figured out where the old info was:

 I appreciate the response and thread is closed as I get a chance to respond.

Doug

[RickyDean]

I have a question, and maybe there is no good answer. I know that the datasheet calls out specs for the 40 pin Dip version of the HDC9234  and the PLCC 44 pin version. What other systems used these chips? Id like to be on the lookout for a PLCC version as well as anymore of the 40 pin version that may pop up. I can't believe that Myarc was the only one using these chips. @Ksarul @InsaneMultitasker, someone?

[+Ksarul]

51 minutes ago, RickyDean said:

I have a question, and maybe there is no good answer. I know that the datasheet calls out specs for the 40 pin Dip version of the HDC9234  and the PLCC 44 pin version. What other systems used these chips? Id like to be on the lookout for a PLCC version as well as anymore of the 40 pin version that may pop up. I can't believe that Myarc was the only one using these chips. @Ksarul @InsaneMultitasker, someone?

Rochester has them, with a minimum order of 19 chips. . .with over 6,000 in stock.

 

 

[RickyDean]

1 hour ago, Ksarul said:

Rochester has them, with a minimum order of 19 chips. . .with over 6,000 in stock.

 

 

Thanks, never thought of them as I've never done business with them before. That doesn't answer the question of other controllers that used the chips, but it is a mute point. Appreciate your knowledge sir. 

[RickyDean]

Looks like I'll have to wait a bit to buy the minimum of 19 though. I'll be patient, don't really need them yet.

[+Ksarul]

16 hours ago, RickyDean said:

Looks like I'll have to wait a bit to buy the minimum of 19 though. I'll be patient, don't really need them yet.

May also be a candidate for a group buy, as there are a number of the HFDCs out there. The "A" variant of the data separator would also be extremely useful, as it is a lot more stable than the one in most of the cards.

[RickyDean]

I'd be in for it, at least 3 to 5.

[+InsaneMultitasker]

It's good to have replacements, especially for cards that were never fully populated.  Based on my not-infallible recollection of repair work, the hard-to-find chips that failed were typically the 9216B, 9223, 9226, DS1000 and 9234 in order from most often to least often replaced. I may have 1-2 spares of a few of these chips having exhausted most of my stock over time.  The logic chips, particularly those connected to the edge connectors like the LS240 and LS374 and especially the LS31/LS32, were always prime suspects for a failed card.  These are still available though not always the brands, like National parts, that were best suited for the circuit.