TTL SRAM interfacing

[Dave Halliday]

>> I have perhaps what is a somewhat unusual question.
>> I would like to make a analog step sequencer with memory. 
>> I just wonder if what I am about to try is possible, or if there is a
>> better way. I would also like to do it without a micro.
>> 
>>       In the Maplin (i think) and/or electronotes designs, they have a 
>> pulse
>> sent to a binary up/down counter which is then fed into 2x8 line
>> decoders..


>> Whats cool if this works is that I could also get a bigger SRAM (say,
>> oh, 16 bit or something) to be able to store other types of data per
>> step, say, portmanto enable, extra gates, extra CVs, or have more
>> pattern memory.

>     The second Formant book contains such an ADC/SRAM/DAC Sequenzer, i 
>     think. Does it makes sense to start up such a project while having 
>     midi and software sequencers ? I think you can do the most stuff with 
>     midi, exept say very fast seqeunces near to audio rate, older records 
>     often have this kind of effects, this is not possible with midi.


Another option might be to explore the PIC chips - you can get a BASIC 
stamp for around $40.  This has a couple K of on-board memory, BASIC 
in ROM and connects to your PC's serial port for programming.  It also 
has several sets of digital and analog( usually cheezy 8-bit though ) 
outputs as well as on-board clocks and timing generators.

I am personally using the 8051 microprocessor because I have 
familiarity and tools but the PIC is really easy to run and they are 
cheap.  Probably less than the cost of the TTL chips...





--- Via Silver Xpress V4.4 [Reg]