Re: Micro-PET

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Wed, 30 Dec 2020 16:29:32 +0100 Message-ID: <407b0771-d06b-1b01-559d-773c5fbed7e4_at_laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 12/30/20 3:56 PM, afachat_at_gmx.de wrote:
> On Dienstag, 29. Dezember 2020 18:19:02 CET Michał Pleban wrote:
>> afachat_at_gmx.de wrote:
>>> Also, the RAM would need to be much faster, and I don't know if there are
>>> faster versions of the 5V tolerant CPLD. Currently I'm using the 6ns
>>> version, I don't think we can go much faster than this.
>>
>> I am running my 8088 board at 12 MHz with the ATF1508 5V CPLD and SRAMs
>> without any problems.
>>
> 
> I just checked the available RAM chips. Through hole parts go down to 55ns
> (maybe 45ns) - that is max 10MHz if at all. Anything faster is SMD ... should
> be possible though.

You can get faster SRAM in DIP. Check older 486 boards for part numbers, 
25ns are doable.

  Gerrit