- W65C02S CPU running at 1MHz
- 32K RAM
- 20K BASIC / OS, 2x4K option ROMs
- Original BASIC 1/2/4
- Custom Mini PET BASIC 4
- Built in ROM/RAM self test
- Compatible with most Commodore PET software and peripherals, with the following exceptions:
- The screen is 40 columns only, so any 80 column (mainly business) software will not look correct on any 40 column PET
- There is no CRTC chip, so any software (mainly later demos) that needs a CRTC will not work
- The CPU socket is not pin compatible with the original NMOS 6502, so nothing that plugged into the 6502 socket will work.
- There are no internal power headers (but these were generally only used in conjunction with the CPU socket above).
- 2x W65C21N and 1x W65C22N providing the following IO ports
- IEEE-488 bus for disk drives / printers
- Userport with 8 bit parallel port
- 8x10 keyboard matrix
- 2x Commodore Datasette connectors (compatible with C2N and 1530)
- Piezo sounder connected to CB2 (as required by Invaders and as fitted to later PETs)
- 1K video RAM providing 40x25 character based display, via one of the following:
- Composite video, monochrome PAL / NTSC
- PET 9" monitor
- PET 12" monitor
- Single 9V DC supply from external supply or PET transformer, 170mA
- Self assembly kits.
- Modest soldering skills are required.
- All through hole parts.
- All brand new and currently in production.
Sunday, 28 June 2020
Sunday, 21 June 2020
This is a new toy I have just got, I've only had it a few days, but I've been quite impressed so far. It is an SQ200 from IKA logic, a 200MHz 4 channel logic analyser / signal generator.
I've been using a DSLogic Pro for the last three or four years, until last month it stopped being detected properly. It is one of those things which has the firmware loaded onto it by the driver, so it connects as one type of device, get the firmware, disconnects and then reconnects as the proper device. That has stopped happening now, and I've not been able to get it to identify properly, so it's bricked, currently waiting to hear back from support to see if there is anything they can do.
TFW8b.com is still open, so go and buy something from there instead.
Sunday, 7 June 2020
The FORTH Language
There are no more items in the Input Buffer, so the Minstrel prints ‘ OK ’ to indicate it has successfully processed all of the instructions it has been given.
( MULTIPLY VALUE ON STACK BY TWO )
Saving Your Work
Before powering off, it is worthwhile to check that you have saved your work successfully and, to do this, you use VERIFY . Rewind your tape to just before the save session and enter VERIFY MYWORDS . You can then play back the saved audio, so that the Minstrel 4th can check if it agrees with what is in memory.
The Minstrel 4th uses a variant of FORTH, called AceForth, developed for an early 1980s micro called the Jupiter Ace. The Minstrel 4th shares the same memory map as the Ace and can run the same monitor and FORTH system as the Ace did. Software written for the Ace (and books about the Ace) should work on (and be relevant to) the Minstrel 4th. In particular, the original Ace user guide, called “Jupiter Ace FORTH Programming” by Steven Vickers, is an excellent book for learning to program the Minstrel 4th. It was recently re-printed to celebrate the Ace’s 35th birthday, so is relatively easy to find on retro-computing auction sites. Further, along with lots of software and other materials, you can find a PDF copy of the user guide on the Jupiter Ace archive website – www.jupiter-ace.co.uk.