HP48 hardware hacking -- SOIC EPROMS?
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04-29-2019, 04:53 PM
Post: #1
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HP48 hardware hacking -- SOIC EPROMS?
I've been doing some HP48G/GX hardware hacking and I'm in need of a 32-pin SOIC EPROM. The problem is that all I can find are 32-PIN PDIP EPROMS or 32-lead PLCCs. I know I can use a daughterboard with an SMD PLCC chip but it would be a very tight fit and a real PITA. Does anyone know where to get 4Mbit x 8 32-pin EPROMS in SOIC packages, or are they no longer being produced?
Thanks, Jonathan Aeternitas modo est. Longa non est, paene nil. |
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04-30-2019, 11:31 AM
Post: #2
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RE: HP48 hardware hacking -- SOIC EPROMS?
Hi
I'm not sure they were ever available in the SOIP package. You may be able to find some TSOP or TSSOP devices but I'm guessing they are too wide / long? BR Frank |
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04-30-2019, 03:18 PM
Post: #3
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RE: HP48 hardware hacking -- SOIC EPROMS?
(04-30-2019 11:31 AM)franco51 Wrote: Hi Thanks for the reply ![]() It seems that Microchip Technology has the largest selection of ICs in which I'm interested and I might have some luck. There are some DIP to SMT adapters, but, I'm not sure if they're compatible dimension wise. Thanks, Jonathan EDIT : I've checked several electronics distributors and it seems that 32-pin 4Mbit x 8 OTP EPROMS are only available from Microchip Technology in PLCC packages. See here : https://www.digikey.com/products/en/inte...ageSize=25 I guess an adapter or daughterboard is what's needed then. I've found some DIP to SOIC adapters, but they're not the right size and they only have 28 pins. I guess I'll have to use a daughterboard. Aeternitas modo est. Longa non est, paene nil. |
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05-01-2019, 07:32 AM
Post: #4
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RE: HP48 hardware hacking -- SOIC EPROMS?
(04-30-2019 03:18 PM)Jonathan Busby Wrote:(04-30-2019 11:31 AM)franco51 Wrote: Hi You might be able to find some of these obsolete ones, maybe: https://www.digikey.co.uk/products/en/in...ageSize=25 Or, there are SPI flash chips that are in a 16 pin package. If you could find a suitable small FPGA you could create a parallel interface for the SPI flash chip. Or, if you could find a suitable microcontroller in a SOIC32 and it was fast enough, you could maybe emulate a ROM? Andrew |
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05-04-2019, 05:15 PM
Post: #5
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RE: HP48 hardware hacking -- SOIC EPROMS?
(05-01-2019 07:32 AM)blackjetrock Wrote: You might be able to find some of these obsolete ones, maybe: Thanks for the tip ![]() ![]() Regards, Jonathan Aeternitas modo est. Longa non est, paene nil. |
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