ROM Module for RC2014 homebrew computer that supports various page sizes and can be paged out for RAMDesigned by RFC2795 Ltd in United Kingdom
What is RC2014? RC2014 is a simple 8 bit Z80 based modular computer. It is inspired by the home built computers of the late 70s and computer revolution of the early 80s. It is not a clone of anythi...Read More…
RC2014 is a simple 8 bit Z80 based modular computer. It is inspired by the home built computers of the late 70s and computer revolution of the early 80s. It is not a clone of anything specific, but there are suggestions of the ZX81, UK101, S100, Superboard II and Apple I in here. It nominally has 8K ROM, 32K RAM, runs at 7.3728MHz and communicates over serial at 115,200 baud. As a bare minimum, you will need a CPU, ROM, RAM, Clock and Input/Output module. The RC2014 is designed in such a way that you can build your own modules to expand it. As such, if you have access to similar components, or have specific needs, you might not need all the items I have on offer.
This is the ROM module which is supplied with the RC2014 Pro or RC2014 CP/M Upgrade Kit, although it can also be used as a replacement for the CPU module supplied with the RC2014 Classic ][, or if you are building your own custom RC2014 variant. It can be used with Standard Bus backplanes (Backplane 5 or Backplane 8) with single row header pins, or with Enhanced Bus backplanes (Backplane Pro) with double row header pins. If the Standard Bus option is chosen, then a 10 pin straight header is also supplied in case you need access to the /PAGE signals.
This module offers more features including the option of paging itself out and paging the lower half of the 64K RAM Module in for a full 64k RAM
Standard Kit This includes all the components to build the Pageable ROM Module including header pins, chips sockets, chips (excluding ROM), jumpers and standard 28 pin socket
ZIF Socket Kit As above, except a ZIF socket is supplied in place of the standard 28 pin socket (see note below regarding fitting)
PCB Only Yup, you're right. Only the PCB is supplied with this option
I recommend the use of a 27C512 PROM with this module. This is a non-erasable EPROM and the same type as supplied with the standard RC2014 ROM kit. The one supplied with the standard kit has Microsoft BASIC for a 32k RC2014 supplied in the first 8k, leaving 56k spare for you to use.
If you wish to purchase one with this kit you have 3 options;
For ROM label designations, see http://rc2014.co.uk/1515/decoding-rom-labels/
Note - ZIF socket can be used with this module - however, the release bar is fouled by the 74LS32 chips when in the locked position. You can get around this by soldering the 74LS32 direct to the PCB to lower the height, or fit the ZIF socket backwards so the release bar extends on the opposite side, or cut the bar down
SCM is Small Computer Monitor written for the RC2014 by Steve Cousins
RC2014 is a trademark of RFC2795 Ltd.
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Kim | Sept. 17, 2017
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