HM6116 2Kx8bit SRAMs on ebay .. ideal for SPECULATOR ?

[lezanderson]

Spotted some SPECULATOR SRAMs on ebay.. at a respectable price £1.59 for 5pcs Ideal for anyone who is reverse engineering a SPECULATOR ZX Spectrum Emulator ? As these are getting quite rare it's unusual to see them for this sort of price.

http://www.ebay.co.uk/itm/HM6116L-120-P ... 5b0a118b06

[1024MAK]

@ Lez, Thanks for posting this

Mark

[lezanderson]

The ICs are still available :shouldn't be too expensive to make a NEW Speculator PCB ?

PAL14L4s ebay.com
SN74LS74 Mouser £0.404 each
DM74LS123N Mouser price £0.56 each



http://www.ebay.com/itm/2PCS-PAL14L4ANC ... 4607e5788e

http://www.ebay.com/itm/10PCS-FLIP-FLOP ... 3cc35301b3

http://www.ebay.com/itm/5-x-SN74LS123-7 ... 27ba754ffa

[Martin A]

Mouser do versions of the 6116

http://uk.mouser.com/Semiconductors/Mem ... 16&FS=True

And the ATF16V8 that can replace all the old 20 pin PAL's too

http://uk.mouser.com/Semiconductors/Pro ... v8&FS=True

[1024MAK]

Spotted some SPECULATOR SRAMs on ebay.. at a respectable price £1.59 for 5pcs Ideal for anyone who is reverse engineering a SPECULATOR ZX Spectrum Emulator ? As these are getting quite rare it's unusual to see them for this sort of price.

http://www.ebay.co.uk/itm/HM6116L-120-P ... 5b0a118b06

So I ordered some earlier this week. Then today I received this message:-

New message from: highstreet1955 (123,415)
We would like to inform you that, it has come to our attention the item you have ordered was being dispatched but unfortunately, it was damaged in the process. We could not send you the damaged item; therefore, we have been contacting the suppliers to get the items in as soon as possible in order to meet your need as we only had one left. Unfortunately, there is not an available date from the supplier as to when we will get items. To resolve this matter, we would like to refund you the total amount.

We apologize for the inconvenience caused, as it was sudden for us and this matter does arise in a business environment from time to time. We hope this is understandable. I have no choice but to cancel this order and refund you. Please be informed that e-bay will message you to confirm the cancelation; please do remember to confirm it in order the refund to go through.

Regards
Kindest Regards

SpareseXpert
Customer Service Department

Please kindly do not leave negative feedback, we aim to work with you to sort out any issues that you may have.

And eBay and PayPal messages about a refund.

I wonder if the other buyer got theirs (I was the second buyer). At the time my order was confirmed, eBay showed the seller having I think over 50 available. So the "story" above sounds like a stock letter, either that or the chips were not they type that the seller thought they were.

Mark

[lezanderson]

Looked too good to be true...! Once upon a time there were loads of Very Very cheap ICs on ebay, when people where having a clear-out and simply just wanted them to go to a good home ! But sadly those days have gone and now everybody is greedy !

Still plentiful on ebay as pulls !

http://www.ebay.com/itm/NEW-10PCS-HY611 ... 3cfb1b10a6

Though Mouser/Digikey etc stuff is obviously NEW or NOS you do pay a large premium !

[lezanderson]

Mouser do versions of the 6116

http://uk.mouser.com/Semiconductors/Mem ... 16&FS=True

And the ATF16V8 that can replace all the old 20 pin PAL's too

http://uk.mouser.com/Semiconductors/Pro ... v8&FS=True

Speculator PCB connector : Where do you get the PCB Edge Connectors from ??

[Martin A]

Mouser do versions of the 6116

http://uk.mouser.com/Semiconductors/Mem ... 16&FS=True

And the ATF16V8 that can replace all the old 20 pin PAL's too

http://uk.mouser.com/Semiconductors/Pro ... v8&FS=True

Speculator PCB connector : Where do you get the PCB Edge Connectors from ??

The last batch I brought were from Maplin

http://www.maplin.co.uk/p/254mm-double- ... ctor-jc03d

But it looks like it's the end of line for them. The right angle ones Dave found for the Magrom boards were from E-bay I think.

[lezanderson]

So it should be able to reverse engineer and make a NEW Speculator as all the components are still available ?

PCB £10 (Guess)
PAL14L4-2CN £1.50 each (2pcs)
SN74LS74 Flip Flop £0.25 each (5pcs=£1.25)
DN74LS123N Dual Retriggerable Monostable Multivibrator £1.0 each
HM6116 2Kx8bit SRAM £0.75 each
Resistors/Caps/IC sockets etc £1.5

Should be able to do it for £16.50 each ??


Obviously the Hard part is designing the PCB !

[lezanderson]

HM6116-70 70ns SRAMs on ebay.com


G&C have these on ebay.com : 2 lots/Auctions : 3pcs HM6116-7 (starting BID $0.99) might be worth a bid ?

http://www.ebay.com/itm/3pcs-HM6116LP-7 ... 463d1c9d94